java - 如何使用此 "removeDuplicate(ArrayList list)"方法删除重复的整数？

Question

(Remove duplicates) Write a method that removes the duplicate elements from an array list of integers using the following header:

public static void removeDuplicate(ArrayList<Integer> list)

Write a test program that prompts the user to enter 10 integers to a list and displays the distinct integers separated by exactly one space.

import java.util.ArrayList;
import java.util.Scanner;

class RemoveDuplicates {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);

    ArrayList<Integer> list = new ArrayList<>(10);
    System.out.print("Enter 10 integers: ");

    while (in.hasNextInt()) {
      list.add(in.nextInt());
    }

    System.out.println("The list is " + list);
  }

  public static void removeDuplicates(ArrayList<Integer> list) {

    int value = 0;

    do {

      if (!list.contains(value) && value != 0) list.add(value);

    } while (value != 0);

    for (int i = 0; i < list.size(); i++) System.out.print(list.get(i) + " ");
  }
}

Answer 1

编辑:

您的程序将连续接受输入，因此您应该限制扫描仪在计数达到 10 时停止接受输入。

你应该改变你的 while 循环

while (list.size()<10) {
            list.add(in.nextInt());
        }

然后你还没有调用你的方法removeDuplicates(list);，所以你应该在接受这样的输入后调用它

删除重复项(列表);

<小时/>

只需添加HashSet即可从 arraylist 中它会自动删除它

Set<Integer> set = new HashSet<>(listContainDupRec)

如果您想按升序或降序对元素进行排序，请使用 TreeSet