程序代码：

public class TwoleverForloop
{
  public static void main(String [] args)
  {
    //2d array alocation, just demo
    int twoDarray[][] = new int[3][3]; 
    
    //2d array init, just demo
    for(int i = 0; i<3; i++)
    {
      for(int j = 0; j<3; j++)
      {
        twoDarray[i][j] = (i+1)*(j+1);
      }
    }
    
    //display
    for(int i = 0; i<3; i++)
    {
      for(int j = 0; j<3; j++)
      {
        System.out.print(twoDarray[i][j]);
      }
      //make a new line
      System.out.println();
    }
  }
}