JAVA中构造器和方法的使用

Question

class people{
string cardID;
string name;
int age;
}
（1）请为上面的类加上构造器
（2）请为age加上get（）方法（获取age的值）和set（）方法（设置age的值）

Answer 1

public class People {
    String cardID;
    String name;
    int age;
    public People(){}
    public People(String cardID, String name, int age) {
        this.cardID = cardID;
        this.name = name;
        this.age = age;
    }

    public int getAge() {
        return age;
    }

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