int is not an object in Java

Type int in Java is not an object. So when we assign a previously created int variable to another newly created int variable, they are not sharing the same memory (they are mutually independent).

	int nu1 = 13;
	int nu2 = nu1;
	nu2 = 12;
	//now nu1 is still 13, and nu2 is 12

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Unlike type int, String is an object in Java. When we assign a previously created string assigned to another newly created string, they share the same object.
PS. String is not mutable.

	String str1 = "Hello World";
	String str2 = str1;
	str2.replace("H", "X");//replace is an accessor, not a mutator
	System.out.println(str2);
	//print "Hello World"
	System.out.println(str1);
	//print "Hello World"
	String str3 = str1.replace("H", "X");
	System.out.println(str3);
	//print "Xello World"

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