打印M
public static void main(String[] args){
int num = 9;
int arr[][] = new int[3][9];
int x = 2;
int y = 0;
boolean order = false;
for(int i=1;i<=9;i++){
arr[x][y] = i;
y++;
if(!order){
x--;
}
if(order){
x++;
}
if(x<0){
order = true;
x += 2;
}
if(x>2){
order = false;
x -= 2;
}
}
for(int i=0;i<arr.length;i++){
for(int j=0;j<arr[i].length;j++){
if(arr[i][j]=0){
System.out.print(" ");
}esle{
System.out.print(arr[i][j]);
}
}
System.out.println();
}
}