java arraylist 替换

import java.util.ArrayList;

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

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

        System.out.println(list); // 输出: [Apple, Blueberry, Cherry]
    }
}

import java.util.ArrayList;

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

        // 替换所有值为"Banana"的元素
        for (int i = 0; i < list.size(); i++) {
            if ("Banana".equals(list.get(i))) {
                list.set(i, "Grape");
            }
        }

        System.out.println(list); // 输出: [Apple, Grape, Cherry, Grape]
    }
}

if (index >= 0 && index < list.size()) {
    list.set(index, newValue);
} else {
    System.out.println("索引越界");
}