Java从List中删除元素的几种方式小结

import java.util.Iterator;
import java.util.List;
import java.util.LinkedList;
​
public class ListDeletion {
    public static void main(String[] args) {
        List<String> list = new LinkedList<>();
        list.add("apple");
        list.add("banana");
        list.add("cherry");
​
        // 使用迭代器删除元素
        Iterator<String> iterator = list.iterator();
        while (iterator.hasNext()) {
            String element = iterator.next();
            if ("banana".equals(element)) {
                iterator.remove();  // 安全地删除元素
            }
        }
​
        System.out.println(list);  // 输出: [apple, cherry]
    }
}

import java.util.ArrayList;
import java.util.List;
​
public class ListDeletionTemporary {
​
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("apple");
        list.add("banana");
        list.add("cherry");
​
        List<String> itemsToRemove = new ArrayList<>();
        for (String item : list) {
            if ("banana".equals(item)) {
                itemsToRemove.add(item);
            }
        }
​
        list.removeAll(itemsToRemove);
        System.out.println(list);  // 输出: [apple, cherry]
    }
}

public class ListDeletionStream {
​
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(Arrays.asList("apple", "banana", "cherry"));
​
        List<String> filteredList = list.stream()
                .filter(s -> !"banana".equals(s))
                .collect(Collectors.toList());
​
        System.out.println(filteredList);  // 输出: [apple, cherry]
    }
}

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
​
public class ListDeletionRemoveIf {
​
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(Arrays.asList("apple", "banana", "cherry"));
        list.removeIf(s -> s.equals("banana")); // 删除等于 "banana" 的所有元素
​
        System.out.println(list);
    }
}

import java.util.LinkedList;
import java.util.ListIterator;
​
public class ListDeletionListIterator {
​
    public static void main(String[] args) {
        // 创建一个LinkedList并添加一些元素
        LinkedList<String> list = new LinkedList<>();
        list.add("One");
        list.add("Two");
        list.add("Three");
        list.add("Four");
        list.add("Five");
​
        System.out.println("Original list: " + list);
​
        // 获取ListIterator
        ListIterator<String> iterator = list.listIterator();
​
        // 移动到第一个元素
        if (iterator.hasNext()) {
            iterator.next();  // 移动到"One"
        }
​
        // 删除特定元素
        while (iterator.hasNext()) {
            String element = iterator.next();
            if ("Three".equals(element)) {  // 删除"Three"
                iterator.remove();
            } else if ("Four".equals(element)) {  // 删除"Four"
                iterator.remove();
            }
        }
​
        System.out.println("Modified list: " + list);
    }
}

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
​
public class ListDeletionParallelStream {
​
    public static void main(String[] args) {
        // 创建一个ArrayList并添加一些元素
        ArrayList<String> originalList = new ArrayList<>();
        originalList.add("One");
        originalList.add("Two");
        originalList.add("Three");
        originalList.add("Four");
        originalList.add("Five");
​
        System.out.println("Original list: " + originalList);
​
        // 使用并行流过滤出需要保留的元素
        List<String> filteredList = originalList.parallelStream()
                .filter(item -> !"Three".equals(item) && !"Four".equals(item))
                .collect(Collectors.toList());
​
        System.out.println("Filtered list: " + filteredList);
    }
}