How to call member variables and member methods of objects in Java

Use objects to access members in a class:

对象名.成员变量；
对象名.成员方法();

Default value of member variables:

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Specific example code:

public class StudentTest_01 {
    public static void main(String[] args) {
        //创建对象格式，类名 对象名 = new 类名();

        //无参数使用方法
        Student s2 = new Student();
        s2.setName("千寻1");
        s2.setAge(25);
        System.out.println("姓名："+ s2.getName());
        System.out.println("年龄："+ s2.getAge());
        System.out.println("‐‐‐‐‐‐‐‐‐‐");

        //有参数使用方法
        Student s = new Student("千寻2",23);

        System.out.println("姓名："+ s.getName()); //null
        System.out.println("年龄："+ s.getAge());  //0
        System.out.println("‐‐‐‐‐‐‐‐‐‐");

        //调用成员方法
        s.study();
        s.eat();
    }
}

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