Java作业帮忙修改一下。急啊急?共四题

1------------------------- public class Q1 { public static void main(String args[]) { int i; int j; int a[][] = new int[4][3]; for (i = 0; i < 4; i++) { for (j = 0; j < 3; j++) { a[i][j] = (int) (Math.random() * 100 + 1);