详解Java中List的正确的删除方法

package com.example.a;
 
import java.util.ArrayList;
import java.util.List;
 
public class Demo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("a");
        list.add("b");
        list.add("b");
        list.add("c");
        list.add("d");
 
        removeB(list);
    }
 
    private static void removeB(List<String> list) {
        // 待填充
    }
}

private static void removeB(List<String> list) {
    for (int i = list.size() - 1; i >= 0; i--) {
        if ("b".equals(list.get(i))) {
            list.remove(i);
        }
    }
    System.out.println(list);
}

private static void removeB(List<String> list) {
    List<String> newList = list.stream()
            .filter(e -> !"b".equals(e))
            .collect(Collectors.toList());
    System.out.println(newList);
}

private static void removeB(List<String> list) {
    Iterator<String> it = list.iterator();
    while (it.hasNext()) {
        String s = it.next();
        if ("b".equals(s)) {
            it.remove();
        }
    }
    System.out.println(list);
}

private static void removeB(List<String> list) {
    for (String s : list) {
        if ("b".equals(s)) {
            list.remove(s);
        }
    }
    System.out.println(list);
}

private static void removeB(List<String> list) {
    for (int i = 0; i < list.size(); i++) {
        if ("b".equals(list.get(i))) {
            list.remove(list.get(i));
        }
    }
    System.out.println(list);
}

package com.example.a;
 
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;
 
public class Demo {
    private static List<String> list = new ArrayList<>();
 
    public static void main(String[] args) {
        reset();
        // method1();
        // method2();
        // method3();
        // method4();
    }
 
    private static void reset(){
        list.clear();
        list.add("a");
        list.add("b");
        list.add("c");
        list.add("d");
        list.add("e");
    }
 
    
    
    public static void method1() {
        for (int i = 0; i< list.size(); i++) {
            list.remove(i);
        }
        System.out.println(list);
    }
 
    
    
    public static void method2() {
        for (int i = 0; i< list.size(); i++) {
            list.remove(0);
        }
        System.out.println(list);
    }
 
    
    
    public static void method3() {
        int len = list.size();
        for (int i = 0; i < len; i++) {
            list.remove(i);
        }
        System.out.println(list);
    }
 
    
    
    public static void method4() {
        int len = list.size(); // 保证只获取一次长度
        for (int i = 0; i< len; i++) {
            list.remove(0);
        }
        System.out.println(list);
    }
}