One character array is assigned to another in Java, and both changes

One character array is assigned to another in Java, how are the changes synchronized? How do you get them to run on their own?

For example, there is a int[][] a already exists value, now define int[][] b=a, then change the value of a, why B also change? How can that let b not follow a change? If B is not, I want to record the value of a before it changes what should I do? Thank you

If you need B to be constant, you must use a for loop so that each element of the a array is copied into the array of B. B will change with a because they point to the same object.

One character array is assigned to another in Java, and both changes