随机生成阵列打印

Question

处理一个问题，要求创建一个随机生成的 100 个字符的数组(在本例中为 " * "(。字符的总和必须是100，并且必须打印在10行上，其中每行打印随机数量的"*"，但末尾的字符总数("*"(必须为100。我刚开始对Java非常陌生。到目前为止，我已经得到了以下内容，需要帮助。

下面是一个示例输出和我到目前为止的代码：

输出：

0 |*******
1 |*********
2 |***************
3 |*******
4 |******************
5 |*******
6 |****************
7 |*****
8 |****
9 |************

法典：

import java.util.Scanner;
import java.util.Random; 
public class ArrayTest{
  public static void main(String [] args){
    
    
    // The for loop to ensure there is a total of 10 rows 
    
      for(int a=0; a<10; a++){
      Random bytes = new Random();
    
   // Printing the  '*' at random
      int number = bytes.nextInt(10);
      for(int b=0; b<number; b++){
        for(int c=0; c<number; c++){
          System.out.print("*");
        }
        System.out.println();
      }            
      
    }
  }
}

Answer 1

如果允许空行，您可以执行以下操作。您可以引入一个count作为 '* 的总数，让生成的随机数作为一行的星数。打印每一行后，获取计数的剩余部分并将其传递到随机生成器中。检查下面的代码：

class ArrayTest{
    public static void main(String [] args){
        Random bytes = new Random(); //take this out of the loops as mentioned in the comments
        int count = 100; //keep track of 100 '*'s
        for(int a=0; a < 10; a++){ //limit to random 10 rows
            if (count > 0) { //if count reaches 0, don't print anything
                int rand = bytes.nextInt(count + 1);
                for(int b=0; b < rand; b++){ //print random amount of '*'s
                    System.out.print("*");
                    --count; //decrement count for each '*' print
                }
            }
            System.out.println(); //note the next line print is outside the inner for loop
        }
    }
}

这种方法的问题是，如果随机数接近 100，在前几次迭代中，最后几行将为空。

要打印至少 1 个"*"：

Random bytes = new Random(); //take this out of the loops as mentioned in the comments
    int count = 90; //keep track of 100 '*'s, since we anyway print 10 '*'s, keep the count to 90, 
    for(int a=0; a < 10; a++){ //limit to random 10 rows
        System.out.print("*"); //print 1 anyway
        if (count > 0) { //if count reaches 0, don't print anything
            int rand = bytes.nextInt(count + 1);
            for(int b=0; b < rand; b++){ //print random amount of '*'s
                System.out.print("*");
                --count; //decrement count for each '*' print
            }
        }
        System.out.println(); //note the next line print is outside the inner for loop
    }