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Message:

Integer class's object is immutable...

Posted by Kishori Sharan on March 14, 2001 at 9:56 AM

All wrapper classes in Java are immutable i.e. once created cannot be assigned a new value. When you want to set a new value to myInt you need to write
myInt = new Integer ( 20 ) ;
That is, you need to create a new object of Integer class and then assign the reference to myInt.