Java多维数组/打印空值

Question

This is from an array with 10 rows 4 columns. How do I get the if to keep the null values from printing to screen

      for(int j = 0; j < calculation[i].length; j++)
        if (calculation[i] != null)<-------- this does nothing, however if I change it to == null nothing prints to screen
      System.out.print(calculation[i][j] + " \t");
      System.out.print("\n");

Answer 1

This will print the entire array for you except for the null values.

  for(int i = 0; i < calculation.length; i++)
    {
      for(int j = 0; j < calculation[i].length; j++)
      {
        if(calculation[i][j] != null)
           System.out.println(calculation[i][j] + "\t");
      }
      System.out.println("");
    }

Answer 2

calculation[i] may not be null but calculation[i][j] could be.

Change your code to:

if (calculation[i][j] != null) 
      {
   //Your code.
      }