如何计算和仅打印重复项? [英] how to count and print out only duplicates?

问题描述

我知道如何遍历整个数组，但是我只需要重复出现的次数.我是初学者，所以只是循环和数组的基本用法.

I know how to go through whole array, but I only need number of duplicate occurrences. I'm at beginners level, so just basic use of loops and arrays.

int[] array = {12, 23, -22, 0, 43, 545, -4, -55, 43, 12, 0, -999, -87};

for (int i = 0; i < array.length; i++) {
    int count = 0;
    for (int j = 0; j < array.length; j++) {
        count++;   
    }
    System.out.println(array[i] + "\toccurs\t" + count + "X");
}

推荐答案

如果您不仅仅使用循环和数组，则可以做得更好，但是一种简单的算法是使用两个嵌套的 for 循环，并在其中放置 if 语句，当发现重复项时该计数器将递增计数器.

You can do better if you use more than just loops and arrays, but a simple algorithm would be to use two nested for loops, and put an if statement inside that increments a counter when a duplicate is found.

int[] array = {12, 23, -22, 0, 43, 545, -4, -55, 43, 12, 0, -999, -87};

for (int i = 0; i < array.length - 1; i++) {
    int count = 1;
    for (int j = i + 1; j < array.length; j++) {
        if (array[i] == array[j]) {
            count++;
        }
    }
    if (count > 1) {
        System.out.println(array[i] + "\toccurs\t" + count + " times");
    }
}

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