Write a code to prove that strings are immutable in java?

Following program demonstrate it.

File: ProveStringImmutable .java

public class ProveStringImmutable {
	public static void referenceCheck(Object x, Object y) {
		if (x == y) {
			System.out.println("Both pointing to the same reference");
 
		} else {
			System.out.println("Both are pointing to different reference");
		}
	}
	public static void main(String[] args) {
		String st1 = "Java";
		String st2 = "Java";
		System.out.println("Before Modification in st1");
		referenceCheck(st1, st2);
		st1 += "ava";
		System.out.println("After Modification");
		referenceCheck(st1, st2);
	}
}

Output:

Before Modification in st1
Both pointing to the same reference
After Modification
Both are pointing to different reference

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Write a code to prove that strings are immutable in java?

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