public   class  Test {

         public   static   void  main(String[] args) {
                
                 int [] a =  new   int [ 1 ];
                 int [] b =  new   int [ 1 ];

                a[ 0 ] =  1 ;
                b[ 0 ] =  2 ;
                System.out.println(a[ 0 ]);
                System.out.println(b[ 0 ]);


                a = b;
                System.out.println(a[ 0 ]);
                System.out.println(b[ 0 ]);

                a[ 0 ] =  3 ;
                System.out.println(a[ 0 ]);
                System.out.println(b[ 0 ]);
        }

}

---------- run java class ----------
 1 
 2 
 2 
 2 
 3 
 3 

Output completed ( 0  sec consumed) - Normal Termination