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1. This is a common palindrome example ... This is a common palindrome example in java.

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   public class reverseString{

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     public static void main (String[] args){

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       String str = new String(args[0]);

2. helloWorld.java helloWorld.java

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   /* The simplest code in java

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   // to execute it just save this code and compile

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   // $ javac helloWorld.java

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   // $ java HelloWorld

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   */