Question

我试图搜索我的arraylist，“lottoraws”，是否包含我的随机数组c所拥有的整数。我想打印多少个数组c，它们是arraylist。这告诉了有多少纠正到了lottoraw。

//代码：

lottoraws=new ArrayList<int []>();
 }

public void addLottoraws(int 5) { // for example 5

    int[] a = {};

//------------------------Generate random numbers into arraylist

    Random random = new Random();
    for (int i = 0; i < 5; i++) {

        a = new int[7];

        for (int j = 0; j < 7; j++) {
            int rand = (int) (random.nextInt(35));
            a[j] = rand;
        }
        lottoraws.add(a);
    }

    for (int k = 0; k < lottoraws.size(); k++) {
        System.out.println(Arrays.toString(lottoraws.get(k)));
    }

    // -------------------------Generate random numbers into array
    int[] c = new int[7];

    for (int j = 0; j < 7; j++) {
        int rand = (int) (Math.random() * 35 + 1);
        c[j] = rand;
    }
    System.out.println("Dragen rad: \n" + Arrays.toString(c));

    //------------------------...--..-.-.-.-.-.---------Show result

Answer 1

In the below method counterMap will have the number as well its count.

        Random random = new Random();
        List lottoraws = new ArrayList();
        for (int i = 0; i < 5; i++) {

//         int[] a1 = new int[7];

            for (int j = 0; j < 7; j++) {
                int rand = (int) (random.nextInt(35));
//              a1[j] = rand;
                lottoraws.add(rand);
            }

        } // at the end of this loop, our list will have 35 elements. 

        for (int k = 0; k < lottoraws.size(); k++) {
            System.out.println(lottoraws.get(k));
        }

        // -------------------------Generate random numbers into array
        int[] c = new int[7];

        for (int j = 0; j < 7; j++) {
            int rand = (int) (Math.random() * 35 + 1);
            c[j] = rand;
        } // our array will now have 7 random numbers
        System.out.println("Dragen rad: \n" + Arrays.toString(c));

        Map counterMap = new HashMap();

        for(int i=0;i<lottoraws.size();i++){
            int lstNum = (int) lottoraws.get(i);
            int searchCount = Arrays.binarySearch(c, lstNum);
            if(searchCount>-1){
                if(counterMap.containsKey(lstNum)){
//                  System.out.println("found");
                    int counterInc = (int)counterMap.get(lstNum);
                    counterMap.put(lstNum,++counterInc);
                } else
                    counterMap.put(lstNum,1);
            }
        }
        System.out.println(counterMap);

在Arraylist中搜索数组的内容

1 个答案: