java——Object覆写toString

覆写前：

/**
 * Created by xabcd on 2019/2/16.
 */

    class total_print extends Object{
        String name = "张三:" ;
        int age = 25;
    }

/**
 * Created by xabcd on 2019/2/16.
 */
public class test_print
{
        public static void main(String args[])
        {
            total_print p = new total_print();
            System.out.println(p);
        }

}



结果：
total_print@4554617c




覆写后：

/**
 * Created by xabcd on 2019/2/16.
 */

    class total_print extends Object{
        String name = "张三:" ;
        int age = 25;
    public String toString()
    {
        return"我是："+this.name+",今年："+this.age+"岁";
    }
    }

/**
 * Created by xabcd on 2019/2/16.
 */
public class test_print
{
    public static void main(String args[])
    {
        total_print p = new total_print();
//此时本行相当于  System.out.println(p.toString());
        System.out.println(p);
    }

}

结果： 我是：张三:,今年：25岁