java如何修改list中對(duì)象的值

小億
255
2024-04-19 17:40:19
欄目: 編程語言

要修改List中對(duì)象的值,可以通過索引來獲取對(duì)象,然后修改對(duì)象的屬性值。以下是一個(gè)示例代碼:

假設(shè)有一個(gè)Student類,具有屬性name和age,現(xiàn)在有一個(gè)List list存儲(chǔ)了多個(gè)Student對(duì)象,我們想要修改其中一個(gè)Student對(duì)象的屬性值:

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

class Student {
    private String name;
    private int age;

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

public class Main {
    public static void main(String[] args) {
        List<Student> list = new ArrayList<>();
        list.add(new Student("Alice", 20));
        list.add(new Student("Bob", 22));
        list.add(new Student("Charlie", 21));

        // 修改第二個(gè)Student對(duì)象的屬性值
        Student student = list.get(1);
        student.setAge(23);

        // 輸出修改后的List
        for (Student s : list) {
            System.out.println(s);
        }
    }
}

在上面的示例中,我們通過list.get(1)獲取第二個(gè)Student對(duì)象,并通過setAge方法修改了該對(duì)象的age屬性值。然后遍歷List并輸出修改后的結(jié)果。

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