java编写一个五行四列的二维数组输出
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();
}
}
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();
}
}
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();
}
}
温馨提示:答案为网友推荐,仅供参考
第1个回答 推荐于2017-06-16
int[][] arr = new int[5][4];
for(int i = 0; i < 5; i++){
for(int j = 0; j < 4; j++){
System.out.print(arr[i][j]);
System.out.print(" ");
}
System.out.println("");
}
for(int i = 0; i < 5; i++){
for(int j = 0; j < 4; j++){
System.out.print(arr[i][j]);
System.out.print(" ");
}
System.out.println("");
}
输入的全是0
本回答被网友采纳第2个回答 2017-06-16
for(int [] ar : arr){
for(int n : ar){
System.out.print(n+" ");
}
System.out.print("\r\n");
}
System.out.print("\r\n");