Java 学生类：属性、构造方法和 toString 方法

public class Student { private String id; private String name; private int age;

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

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

public static void main(String[] args) {
    Student student = new Student("201000802011", "黎明", 20);
    System.out.println(student.toString());
}

}