Convert lowercase to uppercase in java

Source code below will convert lowercase (hello world) to uppercase (HELLO WORLD)

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COMPLETE SOURCE CODE FOR : ConvertLowerCaseToUpperCase.java
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public class ConvertLowerCaseToUpperCase
{
public static void main(String[]args)
{
 String a="hello world";

 //CONVERT hello world TO HELLO WORLD
 String b=a.toUpperCase();
 System.out.println(b);
}
}

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JUST COMPILE AND EXECUTE IT
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