Using two for loops to loop through a 2D array in java

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As you have a 2-d array, you have two length values for each loop:

  //you have this? array[][];
  for(int i = 0; i < array.length; ++i) {
    for(int j = 0; j < array[i].length; ++j) {
      //do something on array[i][j] 
    }
  }

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