public static void main ( String [ ] args ) {
  int [ ] [ ] arr = {
    {
      1 , 2 , 3 , 4 }, {
        5 , 6 , 7 , 8 }, {
          9 , 10 , 11 , 12 }, {
            13 , 14 , 15 , 16 }
          };
          rotate180 ( arr ) ;
          printMatrix ( arr ) ;
        }
        
public static void main ( String [ ] args ) { int [ ] [ ] arr = { { 1 , 2 , 3 , 4 } , { 5 , 6 , 7 , 8 } , { 9 , 10 , 11 , 12 } , { 13 , 14 , 15 , 16 } } ; rotate180 ( arr ) ; printMatrix ( arr ) ; }
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