Passing by reference means we pass the real reference to the variable in memory. Java object references are passed by value All object references in Java are passed by value.

Copying objects is a common Java programming operation that has one serious trap. Here's how to avoid copying from an object reference and only copy the instance and values you want.

String s1 = new String("Hello world!"); That code will create an s1 string object and a reference variable. As noted, Java strings are immutable. Once created, a string using string class cannot be ...