java - 如何打印与变量值对应的一组字符？

Question

我正在尝试创建一个系统，其中有人输入 0-100 之间的数字，然后程序会将数字分配到设定的边界，基本上是一个成绩存储系统。我会向您展示我的代码，然后详细说明。

public static void main(String[] args) {
//Boundary0/30/40/70 indicates which band the counter is for. e.g. 0-29, 30-39 etc
int Boundary0 = 0;
int Boundary30 = 0;
int Boundary40 = 0;
int Boundary70 = 0;
int Grade;
int count;
count = 0;
Scanner in = new Scanner(System.in);
//Read in first number
System.out.print("Enter an Integer");
 Grade = in.nextInt();



 while (Grade < 100){    
   //To count number of students
   count++;
   //To allocate each grade to corresponding tier
   if(Grade >= 0 && Grade <= 29){
          Boundary0++;
   }
   if(Grade >= 30 && Grade <= 39){
          Boundary30++;
   }
   if(Grade >= 40 && Grade <= 69){
          Boundary40++;
   }
   if(Grade >= 70 && Grade <= 100){
          Boundary70++;
   }
   Grade = in.nextInt();      
 }

 //To print each boundary seperately with the number of marks in each tier and overall total

    System.out.println("0-29:" + " " + Boundary0 );       
    System.out.println("30-39:" + " " + Boundary30);               
    System.out.println("40-69:" + " "+ Boundary40);        
    System.out.println("70-100:" + " " +Boundary70);        
    System.out.println("Amount of Students: " + count);
}
}

当用户输入一个数字时，程序会将相应的边界变量加1

然后当用户输入大于 100 的数字时，程序停止并打印

tiers 并在每一层旁边，告诉用户每一层中有多少个值。

那么我想做的是，在代码的末尾，sout 命令所在的地方，

与其从字面上说每个部分有多少数字，我想表示

例如带*s的值

0-29: *****
30-39: ****
40-69: ********
70-100: *****

抱歉，如果我不是很清楚，我认为这可能只是我自己缺乏理解......

谢谢

Answer 1

创建一个可重用的方法，为您打印 * -

public static void printStars(int n){
   for(int i = 0 ; i < n ; i++)
     System.out.print("*");
}

然后这样调用它-

System.out.println("0-29:" + " " + printStars(Boundary0));
System.out.println("30-39:" + " " + printStars(Boundary30));               
System.out.println("40-69:" + " "+ printStars(Boundary40));        
System.out.println("70-100:" + " " +printStars(Boundary70));