public static void println2() {
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 4; j++) {
System.out.print(i * j + "\t");
}
System.out.println();
}
}
这个结果就是
1 2 3 4
2 4 6 8
3 6 9 12
4 8 12 16
5 10 15 20
把每一行看做数组的一条内容
或者先定义一个5*4的二维数组,然后存值进去,再打印出来
public static void println2() {
int[][] arr = new int[5][4];
for (int i = 0; i < arr.length; i++) {
for (int j = 0; j < arr[i].length; j++) {
arr[i][j] = i * j;
}
}
for (int i = 0; i < arr.length; i++) {
for (int j = 0; j < arr[i].length; j++) {
System.out.print(arr[i][j] + "\t");
}
System.out.println();
}
}