使用另一个类中的方法从一个类中获取实例变量？

Question

如何从Dog类中获取实例变量hitpoint，并通过eat( x )方法将它们传递给Lion类？

我试图让Lion吃() Lion类中存储在一个新变量中的实例变量中的Dog和减号。

狮类

package helloworld;

public class Lion {
public String name;
public int heightCMeters;
public int lengthCMeters;
public float weightKilos;
public int hitPoints;

public Lion(int hitPoints, String name, int heightCMeters, int lengthCMeters, float weightKilos) {
    this.name = name;
    this.heightCMeters = heightCMeters;
    this.lengthCMeters = lengthCMeters;
    this.weightKilos = weightKilos;
}
public void lionDetails() {
    System.out.println("Name: " + this.name);
    System.out.println("Height CM: " + this.heightCMeters);
    System.out.println("Length CM: " + this.lengthCMeters);
    System.out.println("Weight Kilos: " + this.weightKilos);
}
public void eat(X x) {
    int hitPoints = x.hitPoints  - 10;
    System.out.println(x)
}
}

类犬

package helloworld;

public class Dog {
public String name;
public int heightCMeters;
public int lengthCMeters;
public float weightKilos;
public int hitPoints;

public Dog(int hitPoints, String name, int heightCMeters, int lengthCMeters, float weightKilos) {
    this.name = name;
    this.heightCMeters = heightCMeters;
    this.lengthCMeters = lengthCMeters;
    this.weightKilos = weightKilos;
}
public void dogDetails() {
    System.out.println("Name: " + this.name);
    System.out.println("Height CM: " + this.heightCMeters);
    System.out.println("Length CM: " + this.lengthCMeters);
    System.out.println("Weight Kilos: " + this.weightKilos);
}
public void eat(X x) {
    int hitPoints = x.hitPoints - 10;
    System.out.println(x)

}
}

Answer 1

基本上，狮子可以吃狗，而相反的是事实(这很奇怪，狗没有足够的勇气攻击狮子)。无论如何，您需要的是一个代表吃动物的动物的abstract class，这个类应该包含您提到的hitPoint。

abstract class X {
 public int hitPoints; 
}
// Lions are edible
class Lion extends X{

  public void eat(X x) { // pass an edible object
  int hitPoints = x.hitPoints  - 10;
  System.out.println(x)
  }
}  

//Dogs are edible as well
class Dog extends X{

 public void eat(X x) { // pass an edible object
  int hitPoints = x.hitPoints  - 10;
  System.out.println(x)
  }
}

现在，狮子要吃狗，

Lion predator = new Lion();
Dog prey = new Dog(); 
predators.eat(prey); // this passed dog will be eaten 

Answer 2

最好的方法是为Lion类编写测试类或编写主要方法，这将维护两个类的命中点。

 class Test{

    public static void main(String[] args){

         Dog puppy=new Dog(10,"Moti",12,12,31);
         Lion oldLion=new Lion(20,"Old Lion",12,12,43);

         oldLion.eat(puppy);

    }

 }

Answer 3

您必须有一个抽象类Animal，，其中定义了所有公共方法。

对于eat方法的Lion类，

public void eat (Animal animal) {
    this.hitPoints-=animal.hitPoints;
}

对于eat方法的Dog类，也有相同的逻辑。