小编mic*_*ott的帖子

我有一个问题,为什么在main方法调用printPersonPrinting()方法时隐式调用toString()方法.

public class PersonPrinting {

    private String name;
    private int age;

    public PersonPrinting(String aName, int anAge) {
        name = aName;
        age = anAge;
    }

    public String toString() {
        return name + " " + age;
    }

    public void printPersonPrinting() {
        System.out.println(this);
    }

    public static void main (String [] args) {
        PersonPrinting p = new PersonPrinting("Dan",10);
        //printPersonPrinting is called, but toString isn't. 
       //But the output is formatted by toString method.
        p.printPersonPrinting();
    }
}

此代码的输出是 - > Dan 10

谢谢!!