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JAVA Mutable and Immutable concept
String str=new String("JAVA");
System.out.println("value of str before "+str); //JAVA String str2=null; str=str2; System.out.println("value of str"+str); //null System.out.println("value of str2"+str2);//null str="Prog"; System.out.println("value of str"+str); //prog System.out.println("value of str2"+str2);//null Ques 1 If string is immutable why is value of str changing? Student stu= new Student(123); System.out.println("value of stu before "+stu); //some address is printed Student stu2=null; stu=stu2; System.out.println("value of stu"+stu); //null System.out.println("value of stu2"+stu2);//null Student stu3=new Student(456); stu=stu3; System.out.println("value of stu"+stu); //some new address System.out.println("value of stu2"+stu2);//null Ques 2.String and Object are behaving in same way .Then why String is immutable and Object mutable. Where's the difference |
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