Allocating 2 dimension array of a class Java -

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It's just working fine. 

  test [] [] matrix = new exam [5] []; For (int i = 0; i <5; i ++) {matrix [i] = new test [5]; For (int j = 0; j and lt; 5; j ++) matrix [i] [j] = new test (); }   
 It does not work  
  [to (Test] t: Matrix) {t = new trial [5]; For (test T2: T) T2 = new test (); }   
 It is working  
  int [] [] matrix 2 = new Int [5] [5];   
 Without starting at all  
 Why is the question?   
 
 
 Because you are assiming for local variables and not  Matrix  .  
 for  (test [] t: matrix) {t = new test [5]; // You are assing for a local variable / / t is a local variable! }   
 To make it more clear:  
  (int i = 0; i & lt; matrix.length; i ++) {Test [] t = matrix [i]; // t is clearly a local variable // It will specify a new array for local variables: T = new test [5]; // matrix [i] is still empty, to prove: system.out.println (matrix [i]); // print "empty"}

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