我不知道如何将 0-9 之间随机生成的 100 个数字与数组值(也是 0-9 之间)进行比较,然后打印结果。对我放轻松,我是编码新手,我知道我很烂。我觉得我已经达到了 75%。我知道有一些方法可以减少一些代码的冗余,但我似乎很难使用这些技术。
这是我目前所拥有的:
public static void main(String[] args) {
double randomNum = 0;
for (int i = 0; i < 100; i++) {
randomNum = Math.random() * 10;
int count0 = 0, count1 = 0, count2 = 0, count3 = 0, count4 = 0;
int count5 = 0, count6 = 0, count7 = 0, count8 = 0, count9 = 0;
int [] arrayNums = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
for (double j = 0; j <arrayNums.length; j++){
if (arrayNums[0] == randomNum) {
count0++;
}
else if (arrayNums[1] == randomNum){
count1++;
}
else if (arrayNums[2] == randomNum){
count2++;
}else if (arrayNums[3] == randomNum){
count3++;
}else if (arrayNums[4] == randomNum){
count4++;
}else if (arrayNums[5] == randomNum){
count5++;
}else if (arrayNums[6] == randomNum){
count6++;
}else if (arrayNums[7] == randomNum){
count7++;
}else if (arrayNums[8] == randomNum){
count8++;
}
else{
count9++;
}
}
System.out.print("Occurrences of 0: " + count0);
System.out.print("\nOccurrences of 1: " + count1);
System.out.print("\nOccurrences of 2: " + count2);
System.out.print("\nOccurrences of 3: " + count3);
System.out.print("\nOccurrences of 4: " + count4);
System.out.print("\nOccurrences of 5: " + count5);
System.out.print("\nOccurrences of 6: " + count6);
System.out.print("\nOccurrences of 7: " + count7);
System.out.print("\nOccurrences of 8: " + count8);
System.out.print("\nOccurrences of 9: " + count9);
}
}
感谢任何帮助。
最佳答案
- 使用 HashMap 作为计数器比单独使用一个更优雅 每个项目的变量。
使用
Random.nextInt(10)
生成 0 到 9(含)之间的随机数。Map<Integer, Integer> counter = new HashMap<Integer, Integer>(); Random rand = new Random(); for (int i = 0; i < 100; i++) { int randomNum = rand.nextInt(10); Integer currentCount = counter.get(randomNum); if (null == currentCount) { counter.put(randomNum, 1); } else { counter.put(randomNum, currentCount+1); } } for (Integer key : counter.keySet()) { System.out.println(key + " -> " + counter.get(key)); }
示例输出
0 -> 12
1 -> 10
2 -> 9
3 -> 6
4 -> 8
5 -> 9
6 -> 11
7 -> 12
8 -> 14
9 -> 9
关于java - 使用数组计算出现次数 - Java,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28470173/