Java使用Collections.replaceAll替换集合元素详解

import java.util.*;

public class ReplaceExample {
    public static void main(String[] args) {
        List words = new ArrayList();
        words.add("apple");
        words.add("banana");
        words.add("apple");
        words.add("cherry");

        // 将所有 "apple" 替换为 "orange"
        boolean result = Collections.replaceAll(words, "apple", "orange");

        System.out.println("替换成功: " + result); // 输出 true
        System.out.println(words); // [orange, banana, orange, cherry]
    }
}

class Person {
    String name;
    int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Person)) return false;
        Person person = (Person) o;
        return age == person.age && Objects.equals(name, person.name);
    }

    @Override
    public String toString() {
        return name + "(" + age + ")";
    }
}

List people = new ArrayList();
people.add(new Person("Alice", 25));
people.add(new Person("Bob", 30));
people.add(new Person("Alice", 25));

Collections.replaceAll(people, 
    new Person("Alice", 25), 
    new Person("Carol", 28)
);

System.out.println(people); // [Carol(28), Bob(30), Carol(28)]