java - 仅打印 int 数组中的重复项以及它们出现的次数

Question

我试图仅打印数组中的重复元素以及每个元素出现的次数。

示例:

Number 0 appears 3 times; 
Number 12 appears 2 times; 
Number 43 appears 2 times

我的代码打印数组的所有元素，而不是仅打印重复的元素。

我必须提到我不能使用 HashMap ，仅conditional statments .
谢谢 下面是代码:

    int[] array = new int[] { 12, 0, -22, 0, 43, 545, -4, -55, 12, 43, 0, -999, -87 };
    int counter = 0, temp = 0;// variable that holds the temporary value of each element
    Arrays.sort(array);
    for (int i = 0; i < array.length; i++) {
        temp = array[i];
        counter = 0;
        for (int j = 0; j < array.length; j++) {
            if (temp == array[j]) {
                counter++;
            }
        }
        System.out.println("Number:" + array[i] + "occurs :" + counter + " times");
    }

Answer 1

您可以使用HashMap或简单排序，因为您的每个评论简单方法如下

  int[] array = new int[]{12, 0, -22, 0, 43, 545, -4, -55, 12, 43, 0, -999, -87};
                int counter = 0, 
                temp = 0;//variable that holds the temporary value of each element
                Arrays.sort(array);
                temp=array[0];
                int count=1;
                for(int i=1;i<array.length;i++)
                {
                    //System.out.println(array[i]);
                    if(temp==array[i])
                    {
                        count++;
                    }
                    else
                    {
                        if(count==1)
                        {
                            count=1;

                        }
                        else{
                        System.out.println(array[i-1]+" "+count);
                        count=1;
                        }
                        temp=array[i];
                    }
                }