2022.6.30DAY591

        Today I want to talk about   About the problem , What is the problem , How to define the problem , How to correctly understand the problem , How to solve the problem .

        What is the problem , Baidu for a while , In talking about , The problem is the gap between reality and expectation , There are two ways to solve problems , One is to lower expectations , One is to change the reality . With the deepening of the summary , I also found many problems of myself , Have those problems been solved by me , Obviously not , I also want to solve these problems , But in the end, it was not solved , Instead, new problems are accompanied by old problems , Those old problems were put aside , Then, when summarizing in the future, it is found that it is an old problem . Solve a problem , Need some way to solve , such as , How to pass some kind of exam , Get the certificate , How to get up early every day . This really requires some methodology , But will something happen , When you have exhausted all the methods you can use , But this problem has not been solved . I don't know if there is such a situation , however , Einstein once said such incredible things ：“ The answers to all difficult questions are at a higher level , You must improve your mind , cognition , level , To solve the problem .” Do I mean , More important than methodology , Raise the mind , cognition , level ？ What impresses me most is playing games , When I got my mobile phone in junior high school, I especially liked playing games , At that time , How I want to grow up , Play mobile phones when you grow up , It doesn't matter to play games , Play as you like , Now , I'm not interested in games anymore （ Maybe the operation is too delicious ）. The original distress , Now it doesn't seem to be a thing at all , Still use what means to resist . Maybe Einstein said this sentence is more meaningful .

read ：《 All four disciplines 》48%

English : nothing , Didn't arrange the time

motion ：3 km , ran 2.5 Then it was interrupted , Sweat profusely after running .

review ：《 Digital logic circuit 》 Chapter two , On the simplification of logical formulas , It is required to master the application of logical formulas .《 Artificial intelligence 》 Deterministic reasoning

public class Animal {
    public  void eat(){
        System.out.println(" Animals eat ");
    }
}

public class Cat extends Animal{

    @Override
    public void eat() {
        System.out.println(" Cats eat fish ");
    }
}

public class AnimalDemo {


    public static void main(String[] args) {
        // There are parent class references to child class objects 
        // polymorphic 
        Animal a=new Cat();
    }
}