Replace word in a sentence using java

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COMPLETE SOURCE CODE FOR : ReplaceAWordInASentence.java
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public class ReplaceAWordInASentence
{
public static void main(String[]args)
{
String a="Hello World";

//REPLACE Hello WITH Hi
String b=a.replaceAll("Hello","Hi");
a=b;
System.out.println(a);

//REPLACE World WITH Dude
b=a.replaceAll("World","Dude");
a=b;
System.out.println(a);
}
}


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JUST COMPILE AND EXECUTE IT
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