从另一个类添加方法

Question

目前，我有 3 个类：Weapon.java、Warrior.java 和 Game.java。我正在尝试从 Weapon.java 访问打击方法。我假设我必须调用类，然后调用罢工方法，但不知道该怎么做。

public class Weapon {
    // Part 1 of ICE16

// 3 properties: String type, int power, and String strikeMessage 
private String type = ""; 
private int power; 
private String strikeMessage; 

// In class Weapon, create a constructor that assigns values to each of these internal private properties of the class in the order above. 
public Weapon (String type, int power, String strikeMessage) {
    this.type = type; 
    this.power = power; 
    this.strikeMessage = strikeMessage; 
}

// Method 1
public int getPower() {
    return power; 
}

// Method 2 
public void strike() {
    System.out.println("Weapon of type " + type + " has power " + power);
    System.out.println(strikeMessage);
}

// Method 3
public void setPower(int power) {
    this.power = power; 
}

}

public class Warrior {
// Part 2 of ICE16

// 4 properties: int age, String name, int expLevel, Weapon weapon 
private int age = 0; 
private String name = ""; 
private int expLevel = 0; 
private Weapon weapon; 

// Create a constructor that assigns each value to the property 
public Warrior(int age, String name, int expLevel, Weapon weapon) {
    this.age = age; 
    this.name = name; 
    this.expLevel = expLevel; 
    this.weapon = weapon; 
}

// Method 1 
public void attack() {
    System.out.println("Warrior, " + name + " with experience level " + expLevel + "attacks!");
} 

// Call strike method from Weapon.java


// Method 2 
public void assignWeapon(Weapon weapon) {
    this.weapon = weapon; 
}

Answer 1

Warrior 类有一个 Weapon 成员，您可以使用它来调用方法：

weapon.strike();

Answer 2

你已经拥有了大部分。在你的attack() 方法调用武器的strike()

public void attack() {
    this.weapon.strike();
    System.out.println("Warrior, " + name + " with experience level " + expLevel + "attacks!");
} 

Answer 3

通过将 Weapon 类设为基类来扩展它，然后您的子类继承 Weapon 类的所有公共成员

public class Warrior Extends Weapon

在调用strike方法之前，创建一个Weapon类的对象，将正确的参数传递给构造函数

Weapon j = new Weapon("gun", 25, "very deadly");

然后你可以继续使用对象引用变量调用strike方法

j.strike();