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CoreJava
CoreJava Examples
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‎.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
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<classpathentry kind="lib" path="lib/json-simple-1.1.jar"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>CoreJava</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.8
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.8

‎bin/Alpha.class

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‎bin/App.class

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‎bin/Beta.class

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‎bin/Calculator.class

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‎bin/Camel.class

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‎bin/Cougar.class

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‎bin/Feline.class

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‎bin/Gamma.class

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‎bin/MyStuff.class

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‎bin/Rideable.class

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‎bin/Test.class

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‎bin/algorithm/Employee.class

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‎bin/algorithm/FibonacciSeries.class

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‎bin/algorithm/Md5Testing.class

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‎bin/algorithm/PalindromeTest.class

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‎bin/algorithm/ReverseString.class

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‎bin/algorithm/ThreadTest.class

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‎bin/collectiontest/IteratorFailFastTest$1.class

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‎bin/collectiontest/IteratorFailFastTest$2.class

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‎bin/collectiontest/IteratorFailFastTest.class

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‎bin/collectiontest/NameList$1NameDropper.class

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‎bin/collectiontest/NameList.class

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‎bin/hackerrank/PrimeCheck.class

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‎bin/hackerrank/atlassian/AsciiTest.class

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‎bin/hackerrank/atlassian/Base7Test.class

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‎bin/hackerrank/atlassian/FindList.class

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‎bin/hackerrank/atlassian/LookAndSay.class

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‎bin/hackerrank/atlassian/RobotCompute.class

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‎bin/java6/Animal.class

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‎bin/java6/Autoboxing_test.class

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‎bin/java6/CarBoard.class

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‎bin/java6/Dog.class

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‎bin/java6/Dozens.class

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‎bin/java6/Dudes.class

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‎bin/java6/DudesChat.class

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‎bin/java6/Ebb.class

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‎bin/java6/Eggs.class

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‎bin/java6/Element.class

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‎bin/java6/FileIOExample.class

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‎bin/java6/IkmTest$Helper.class

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‎bin/java6/IkmTest.class

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‎bin/java6/JSONTest.class

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‎bin/java6/OverAndOver.class

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‎bin/java6/Practice.class

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‎bin/java6/ReadingFor.class

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‎bin/java6/Regex2.class

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‎bin/java6/SuperClass.class

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‎bin/java6/Test1.class

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‎bin/java6/TestException.class

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‎bin/java6/ThreadTest.class

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‎bin/java6/Two.class

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‎bin/java6/WordCount.class

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‎bin/java6/interface1.class

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‎bin/java6/passO.class

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‎bin/java8/A.class

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‎bin/java8/B.class

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‎bin/java8/Base64Test.class

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‎bin/java8/Child.class

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‎bin/java8/DateTimeTest.class

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‎bin/java8/Examjava8.class

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‎bin/java8/Indices.class

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‎bin/java8/Java8Tester$GreetingService.class

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‎bin/java8/Java8Tester$MathOperation.class

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‎bin/java8/Java8Tester.class

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‎bin/java8/MethodRef.class

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‎bin/java8/Nasdaq.class

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‎bin/java8/StreamExample.class

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‎lib/json-simple-1.1.jar

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‎sample.txt

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‎sample1.txt

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‎src/App.java

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import java.util.*;
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public class App {
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public static void main(String[] args) {
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HashMap<Integer,String> p = new HashMap<Integer,String>();
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p.put(7,"A");
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p.put(1,"B");
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p.put(5,"C");
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p.put(1,"D");
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p.remove(1);
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System.out.println(p);
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String[] sa = {"tom ", "jerry "};
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for (int x = 0; x < 3; x++) {
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for (String s : sa) {
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System.out.print(x + " " + s);
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if (x == 1) {
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break;
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}
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}
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}
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}
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}

‎src/Calculator.java

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public class Calculator {
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int num = 100;
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public void calc(int num) {
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this.num = num * 10;
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}
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public void printNum(){
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System.out.println(num);
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}
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public static void main(String[] args) {
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Calculator obj = new Calculator ();
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obj.calc(2);
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obj.printNum();
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}
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}

‎src/Camel.java

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interface Rideable {
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String getGait();
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}
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public class Camel implements Rideable {
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int weight = 2;
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public String getGait() {
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return " mph, lope";
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}
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void go(int speed) {
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++speed; weight++;
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int walkrate = speed * weight;
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System.out.print(walkrate + getGait());
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}
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public static void main(String[] args) {
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new Camel().go(8);
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}
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}

‎src/Cougar.java

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class Feline {
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public String type = "f ";
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public Feline() {
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System.out.print("feline ");
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}
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}
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public class Cougar extends Feline {
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public Cougar() {
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System.out.print("cougar ");
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}
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void go() {
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type = "c ";
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System.out.print(this.type + super.type);
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}
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public static void main(String[] args) {
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new Cougar().go();
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}
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}

‎src/Gamma.java

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class Alpha {
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String getType() {
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return "alpha";
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}
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}
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class Beta extends Alpha {
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String getType() {
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return "beta";
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}
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}
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public class Gamma extends Beta {
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String getType() {
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return "gamma";
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}
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public static void main(String[] args) {
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//Gamma g1 = new Alpha();
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//Gamma g2 = new Beta();
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Alpha g1 = new Gamma();
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Beta g2 = new Gamma();
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System.out.println(g1.getType() + " "
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+ g2.getType());
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}
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}

‎src/MyStuff.java

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public class MyStuff {
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String name;
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MyStuff(String n) {
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name = n;
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}
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public static void main(String[] args) {
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MyStuff m1 = new MyStuff("guitar");
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MyStuff m2 = new MyStuff("tv");
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System.out.println(m2.equals(m1));
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}
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public boolean equals(Object o) {
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MyStuff m = (MyStuff) o;
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if (m.name != null) {
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return true;
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}
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return false;
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}
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}

‎src/Test.java

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public class Test {
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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System.out.println("Hi This is Test");
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}
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}

‎src/algorithm/FibonacciSeries.java

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package algorithm;
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public class FibonacciSeries {
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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for(int i=1;i<10; i++){
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System.out.println(fibonacci2(i));
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}
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}
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public static int fibonacci(int n){
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if(n == 1 || n == 2){
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return 1;
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}
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return fibonacci(n-1) + fibonacci(n-2);
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}
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public static int fibonacci2(int n){
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if(n == 1 || n == 2){
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return 1;
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}
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int sum = 1;
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int f1 = 1;
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int f2 = 1;
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for(int i = 3; i <= n;i++){
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sum = f1 + f2;
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f1 = f2;
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f2 = sum;
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}
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return sum;
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}
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}

‎src/algorithm/Md5Testing.java

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package algorithm;
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import java.io.FileInputStream;
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import java.security.MessageDigest;
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import java.util.Scanner;
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public class Md5Testing {
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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MessageDigest md;
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try {
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FileInputStream fis;
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Scanner scanner = new Scanner(System.in);
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byte[] bytesOfMessage = scanner.next().getBytes("UTF-8");
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md = MessageDigest.getInstance("MD5");
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byte[] mdbytes = md.digest(bytesOfMessage);
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//convert the byte to hex format method 1
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < mdbytes.length; i++) {
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sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
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}
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System.out.println(sb.toString());
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}

‎src/algorithm/PalindromeTest.java

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package algorithm;
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import java.util.Scanner;
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public class PalindromeTest{
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public static void main(String[] args){
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//Scanner scanner = new Scanner(System.in);
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int[] numbers = {1, 20, 22, 102, 101, 1221, 13321, 13331, 0, 11};
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for(int i : numbers){
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System.out.println(" number " + i + " palindrome result is :"+ isPalindrome(i));
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}
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}
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public static boolean isPalindrome(int number){
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if(number == reverse(number)){
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return true;
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}
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return false;
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}
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public static int reverse(int number){
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int reverse = 0;
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while(number != 0){
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System.out.println("number:"+number+ ",reverse:" + reverse +",reverse*10:"+(reverse*10) + ",number%10 :"+(number%10));
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reverse = reverse*10 + number%10;
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number = number/10;
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}
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return reverse;
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}
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}

‎src/algorithm/ReverseString.java

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package algorithm;
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public class ReverseString {
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public static void main(String args[]) {
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//original string
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String str = "Sony is going to introduce Internet TV soon";
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System.out.println("Original String: " + str);
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//reversed string using Stringbuffer
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String reverseStr = new StringBuffer(str).reverse().toString();
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System.out.println("Reverse String in Java using StringBuffer: " + reverseStr);
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//iterative method to reverse String in Java
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reverseStr = reverse(str);
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System.out.println("Reverse String in Java using Iteration: " + reverseStr);
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//recursive method to reverse String in Java
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reverseStr = reverseRecursively(str);
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System.out.println("Reverse String in Java using Recursion: " + reverseStr);
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str = "abc";
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System.out.println("str.length()" + str.length());
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System.out.println("str.substring(0)" + str.substring(0));
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System.out.println("str.substring(1)" + str.substring(1));
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System.out.println("str.substring(0,str.length())" + str.substring(0,str.length()));
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System.out.println("str.substring(0,str.length()-1)" + str.substring(0,str.length() -1));
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System.out.println("str.substring(1,3)" + str.substring(1,3));
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}
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public static String reverse(String str) {
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StringBuilder strBuilder = new StringBuilder();
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char[] strChars = str.toCharArray();
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for (int i = strChars.length - 1; i >= 0; i--) {
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strBuilder.append(strChars[i]);
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}
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return strBuilder.toString();
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}
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public static String reverseRecursively(String str) {
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// System.out.println(" reverseRecursively Calling str: "+ str);
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//base case to handle one char string and empty string
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if (str.length() < 2) {
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// System.out.println(" reverseRecursively returing str: "+ str);
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return str;
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}
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// System.out.println(" reverseRecursively befor returing str.substring(1): "+ str.substring(1) + ", str.charAt(0):"+ str.charAt(0));
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return reverseRecursively(str.substring(1)) + str.charAt(0);
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}
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}

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