循环打印问题

Question

不知道这样的图形怎么用循环打印
     *
   *  *
  *    *
 *      *
*        *
 *      *
  *    *
   *  *
    * 

Answer 1

import java.util.Scanner;
class TT{
public static void main(String[] args){
System.out.println("请输入你要的级数：");
Scanner s=new Scanner(System.in);
int y=s.nextInt();
print(y);
}
public static void print(int line){
int m=line/2;
for(int i=0-m;i<=m;i++){
for(int j=0-m;j<=m;j++){
System.out.print((Math.abs(i)+Math.abs(j))==m ? "*":" ");
}
System.out.println();
}
}
}

Answer 2

崩溃！前几天我刚刚回答了这个问题！public class Work {
    public static void main(String[] args) throws IOException {
            System.out.println("请输入一个菱长:");
            int len; // 菱长
              String outstr=new String(); // 输出
              int i,j,x,y; 
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String str = br.readLine();
            len=Integer.parseInt(str);             
            for(i=0;i<=len*2;i++){ 
            for(j=0;j<=len*2;j++){ 
            x=len-i; 
            x=x<0?-1*x:x; 
            y=len+(len-x); 
            outstr+=(j==x||j==y?"*":"　"); 
            } 
            outstr+=" "; 
            } 
            System.out.println(outstr); 
            }