Reverse Java in the array

public  class ArrayDemo2 {
     public  static  void main (String [] args) {
         // definition of an array element storing 
        int [] = {ARR3 10, 20 is, 30, 40, 50, 60, 70, 80, 90 };
         // ARR3 .length / 2 needs to swap times 
        for ( int I = 0; I <arr3.length / 2; I ++ ) {
             // for swap array 
            int SUM = ARR3 [I]; 
            ARR3 [I] = ARR3 [ARR3. length -. 1 - I]; 
            ARR3 [arr3.length -. 1 - I] = SUM; 
        } 
        for ( int I = 0; I <arr3.length; I ++) {// Re traversal of the primary array 
            of System.out.print (ARR3 [I] + "" ); 
        } 
    } 

}