应该添加什么来计算和输出每个行为的可变能量的增加或减少？

Question

应该添加什么来计算和输出每个行为的可变能量的增加或减少？能量的初始值：个人、学生和学生工作者为10，专业人员和研究人员为8。

person: speak -2, eat +3, walk -3, sleep +3
student: speak -2, eat +3, walk -1, sleep +3, study -1
studentworker: speak -2, eat +3, walk -1, sleep +2, work -3, study -2
researcher: speak -2, eat +3, walk -2, sleep +3, research -2
professor: speak -2, eat +3, walk -2, sleep +3, research -1, teach -1

null

java prettyprint-override">    class Person
    {
        int Energy = 10;
        void sleep() { System.out.println("sleep"); this.Energy += 3;}
        void eat() { System.out.println("eat"); this.Energy += 3; }
        void speak() { System.out.println("speak"); this.Energy -= 2;}
        void walk() { System.out.println("walk"); this.Energy -=3;}
        
        public void person(int Energy)
        {
            this.Energy = Energy;
        }
    }

    class Student extends Person
    {       
            int Energy = 10;
            void study()
            {
                System.out.println("study");
                this.Energy -= 1;
            }
    }

    class StudentWorker extends Student
    {
        int Energy = 10;
        void work()
        {   
            this.Energy -= 3;
            System.out.println("work");
        }
    }

    class Researcher extends Person
    {   
        int Energy = 8;
        void research()
        {   
            this.Energy -= 2;
            System.out.println("research");
        }
    }

    class Professor extends Researcher
    {   
        int Energy = 8;
        void teach()
        {   
            this.Energy -=1;
            System.out.println("teach");
        }
    }
    
    public class _java {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Person p = new Person();
            
            Student s = new Student();
            System.out.println("Case 1: Student: ");
            p.sleep(); p.eat(); p.walk(); p.speak(); s.study();

            StudentWorker sw = new StudentWorker();
            Researcher r = new Researcher();
            
            Professor pf = new Professor();
            System.out.println("Case 2: Professor: ");
            pf.teach(); p.speak(); p.walk(); r.research(); p.sleep();
            System.out.println();
            
            System.out.println("Case 3: Person: ");
            p.sleep(); p.eat(); p.speak(); p.walk();
        }
    }

Answer 1

您应该重新阅读一些关于继承、控制对字段和构造函数的访问的基本教程，以解决代码中的以下问题：

1. 类person缺少一个默认构造函数，以及一个具有int energy参数的构造函数（而不是方法void person=应该是setterpublic void setEnergy（int value))

class Person {
    public Person() {
        this(10);
    }
    public Person(int energy) {
        this.energy = energy;
    }
// ...
}

但是通过getters/setters访问字段要好得多，这里可以实现spendenergy/gainenergy这样的方法来减少/增加能量量：

// class Person
public void setEnergy(int value) {
     this.energy = value;
}
public int getEnergy() {
     return energy;
}
public void spendEnergy(int delta) {
    this.energy -= delta;
}
public void gainEnergy(int delta) {
    this.energy += delta;
}

然后在sleep、eat、walk等中使用这些方法修改能量和重写方法walk、sleep等，以提供特定的值，例如：

// class Person
void eat() {
    System.out.println("eat");
    gainEnergy(3);
}
void walk() {
    System.out.println("walk");
    spendEnergy(3);
}

// class Student
void study() {
    System.out.println("study");
    spendEnergy(1);
}
void walk() {
    System.out.println("walk");
    spendEnergy(1);
}

// class StudentWorker
void sleep() {
    System.out.println("sleep");
    gainEnergy(2);
}
void study() {
    System.out.println("study");
    spendEnergy(2);
}
void work() {
    System.out.println("work");
    spendEnergy(3);
}

// walk from Student is used with energy spend 1

class Researcher extends Person {
    public Researcher() {
        super(8);
    }
// ...
}