构造一个m行n列的二维数组(mln的取值均小于等于4， mln均由键盘输入),并由键盘输入数组元素的值，并且按照矩阵的形式输出

 

 

Scanner sc = new Scanner(System.in);
System.out.println("请输入行");
int m = sc.nextInt();
System.out.println("请输入列");
int n = sc.nextInt();
System.out.println(m+"行"+n+"列");
brr= new int[m][n];
for (int i = 0; i < m; i++){
    for (int j = 0; j < n; j++){
        System.out.println("请输入第行"+(i+1)+"第"+(j+1)+"列");
        brr[i][j] = sc.nextInt();
    }
}

for (int i = 0; i < brr.length; i++){
    for (int j = 0; j <brr[i].length; j++){
        System.out.print("brr["+i+"]["+j+"]="+brr[i][j]+"   ");
    }
    System.out.println();
}