类和对象（五）

10.对象的打印

public class Person{
    String name;
    String gender;
    int age;
    
    public Person(String name,String gender,int age){
        this.name = name;
        this.gender = gender;
        this.age = age;
    }
    
    public static void main(String[] args){
        Person person = new Person("Jim","男",18)；
        System.out.println(person);
    }
}

// 打印结果：day20210829.Person@1b6d3586

如果想要默认打印对象中的属性该如何处理？答案：重写toString方法即可。

public class Person{
    String name;
    String gender;
    int age;
    
    public Person(String name,String geender,int age){
        this.name = name;
        this.gender = gender;
        this.age = age;
    }
    
    @override
    public String toString(){
        return "[" + name + "," + gender + "," + age + "]";
    }
    
    public static void main(String[] args){
        Person person = new Person("Jim","男",18);
        System.out.println(person);
    }
}



//输出结果：[Jim,男,18]