随机整数数组中每个值的频率

Question

需要帮助，在我必须在30球中生成1到6之间的随机跑步并获得： 1.总数得分 2. 0s，1s，2s，3s，4s和6s的数量 3.

在我获得“总跑步”和“打击率”时，我无法获得0s，1s ...的频率... 我尝试使用计数器和流方法，但似乎无法正确处理。 高度赞赏您的帮助。 谢谢你！

这是实际的代码，我现在将频率部分标记为块，以便至少其他方法执行...

import java.util.Random;
public class Assignment_2 {
    
    public static void main(String[] args) {
        Random r = new Random();
        System.out.println("Runs for 30 balls");
        int ball[] = new int[30];
        for(int i=0; i<ball.length; i++)
        {
            ball[i] = r.nextInt(6);
            System.out.print(ball[i]+" , ");**
         
    /*  int zeros = 0;
        int ones = 0;
        int twos = 0;
        int threes = 0;
        int fours = 0;
        int fives = 0;
        int sixes = 0;
            if (r.nextInt() == 0 ) {
                zeros++;
            } 
            else if (r.nextInt() == 1) {
                ones++;
            } 
            else if (r.nextInt() == 2) {
                twos++;
            }
            else if (r.nextInt() == 3) {
                threes++;
            }
            else if (r.nextInt()== 4) {
                fours++;
            }
            else if (r.nextInt() == 5) {
                fives++;
            }
            else if (r.nextInt() == 6) {
                sixes++;
            }
            System.out.println(zeros);
            System.out.println(ones);
            System.out.println(twos);
            System.out.println(threes);
            System.out.println(fours);
            System.out.println(fives);
            System.out.println(sixes);
    */
        **}
        
        System.out.println();
        
        System.out.println("Runs Scored");
        float TR=0;
        for(int i : ball)
        {
            TR += i;
        }  
        System.out.print(TR);
        
        System.out.println();
        
        System.out.println("Strike Rate");
        float SR=(TR/30)*100;
        System.out.print(SR);
        
        System.out.println();
        
        
    }
}

Answer 1

 if (r.nextInt() == 0 )

ETC比较了新生成的随机数。 You want to compare what is already used for the ball:

if ( ball[i] == 0 ) .. etc. although using an array to store the counts instead of individual variables would be cleaner and less代码。