Java 去除Arraylist中的重複元素

使用LinkedHashSet數據類型是最簡單的去除ArrayList重複元素的方法。有點類似python裏的set數據類型。上代碼

import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashSet;
 
public class ArrayListExample 
{
    public static void main(String[] args) 
    {
        // ArrayList with duplicate elements
        ArrayList<Integer> numbersList = new ArrayList<>(Arrays.asList(1, 1, 2, 3, 3, 3, 4, 5, 6, 6, 6, 7, 8));
         
        System.out.println(numbersList);
 
        LinkedHashSet<Integer> hashSet = new LinkedHashSet<>(numbersList);
         
        ArrayList<Integer> listWithoutDuplicates = new ArrayList<>(hashSet);
         
        System.out.println(listWithoutDuplicates);
    }
}

代碼結果如下

[1, 1, 2, 3, 3, 3, 4, 5, 6, 6, 6, 7, 8]
[1, 2, 3, 4, 5, 6, 7, 8]

方法摘自：https://howtodoinjava.com/java/collections/arraylist/remove-duplicate-elements/