Java 类中toString方法的作用

学习自https://www.cnblogs.com/thiaoqueen/p/6555307.html

System.out.println(A);

如果A是一个对象，则输出toString方法的内容
例子:

public class ToString {
    @Override
    public String toString() {
        return "this is toString";
    }
}

public class Test2 {
    public static void main(String[] args) {
        ToString toString = new ToString();
        System.out.println(toString);
    }
}

输出结果

this is toString

public class ToString {

    public String getString() {
        return "this is toString";
    }
}

public class Test2 {
    public static void main(String[] args) {
        ToString toString = new ToString();
        System.out.println(toString);
        System.out.println(toString.getString());
    }
}

输出结果

entity.ToString@12a3a380
this is toString