java list替换

import java.util.ArrayList;
import java.util.List;

public class ListReplaceExample {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Apple");
        list.add("Banana");
        list.add("Cherry");

        System.out.println("Original List: " + list);

        // 替换索引为1的元素
        list.set(1, "Blueberry");

        System.out.println("Modified List: " + list);
    }
}

Original List: [Apple, Banana, Cherry]
Modified List: [Apple, Blueberry, Cherry]

import java.util.ArrayList;
import java.util.List;

public class ListReplaceByExample {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Apple");
        list.add("Banana");
        list.add("Cherry");
        list.add("Banana");

        System.out.println("Original List: " + list);

        // 替换所有的 "Banana" 为 "Blueberry"
        for (int i = 0; i < list.size(); i++) {
            if ("Banana".equals(list.get(i))) {
                list.set(i, "Blueberry");
            }
        }

        System.out.println("Modified List: " + list);
    }
}

Original List: [Apple, Banana, Cherry, Banana]
Modified List: [Apple, Blueberry, Cherry, Blueberry]

import java.util.Collections;
import java.util.List;
import java.util.ArrayList;

public class ConcurrentListExample {
    public static void main(String[] args) {
        List<String> synchronizedList = Collections.synchronizedList(new ArrayList<>());
        synchronizedList.add("Apple");
        synchronizedList.add("Banana");

        // 在多线程环境中安全地修改列表
        synchronized (synchronizedList) {
            synchronizedList.set(1, "Blueberry");
        }
    }
}