lingxing.java

本源码主要是上课时所做实验

import java.io.*;
public class Lingxing{
  public static void blank(int x){
   for(int c=0;c< x;c++){
     System.out.print(" ");
   }
   
  }
  public static void star(int y){
    for(int d=0;d< y;d++){
     System.out.print('*');
     System.out.print(" ");
    }
    
  }
  

  public static void main(String args[]){
    String st;
    BufferedReader bu;
    int number;
    try{
     System.out.print("请输入菱形的大小：");
     bu=new BufferedReader(new InputStreamReader(System.in));
     st=bu.readLine();     
    }
    catch(IOException e){
      System.out.println("不是数字型");
      return;
    }
    try{
       number=Integer.parseInt(st);
     }
     catch(NumberFormatException h){
       System.out.println("输入值为非数值");
       return;
     } 
    
    for (int m=number;m>=0;m--){
     blank(m);
     star(number-m);
     blank(m-1);
     System.out.println();  
    }
    for (int m=1;m< number;m++){
     blank(m);
     star(number-m);
     blank(m-1);
     System.out.println();
    }
    
  }
}