JAVA --类与对象（六）传参

淩亂°似流年 2022-12-03 08:55 129阅读 0赞

## 基本类型的传参 ##

方法内无法修改方法外的基本类型变量。

public class hero {
        
    	int hp;
    	float armor;
    	float movespeed;
    	String name;
    	public void huixue(int xp) {
        
    		hp+=xp;
    		xp = 0;
    	}
    	public hero(String name,int hp) {
        
    		this.name = name;
    		this.hp = hp;
    	}
    	public static void main(String args[]) {
        
    		hero a = new hero("二狗",50);
    		System.out.println("姓名:" + a.name);
    		System.out.println("当前血量:" + a.hp);
    		a.huixue(50);
    		System.out.println("经过血瓶的治疗后，血量为:" + a.hp);
    	}
    }

## 引用 ##

基本类型的赋值操作：

int i = 0;

类类型的指向操作：  
(此时的a,不叫做变量，叫引用)

hero a = new hero();

## 类类型传参 ##

public class hero {
        
    	int hp;
    	float armor;
    	float movespeed;
    	String name;
    	public void huixue(int xp) {
        
    		hp+=xp;
    		xp = 0;
    	}
    	public hero(String name,int hp) {
        
    		this.name = name;
    		this.hp = hp;
    	}
    	public void attack(hero a,int damage) {
         //这里是类类型传参
    		a.hp -=damage;
    	}
    	public static void main(String args[]) {
        
    		hero a = new hero("二狗",50);
    		hero b = new hero("提莫",50);
    		System.out.println("姓名:" + a.name + "当前血量:" + a.hp);
    		System.out.println("姓名:" + b.name + "当前血量:" + b.hp);
    		a.huixue(50);
    		System.out.println("经过血瓶的治疗后，" + a.name + "血量为:" + a.hp);
    		System.out.println("二狗对提莫发起攻击，提莫血量为:" + b.hp);
    		a.attack(b, 20);      //这里是普通方法传参
    	}
    }

综合练习：在方法中，使参数引用指向一个新的对象

外面的引用是指向原来的对象？还是新的对象？

public class heros {
        
    	int hp;
    	String name;
    	float armor;
    	int movespeed;
    	public heros() {
        
    	}
    	public heros(String name,int hp) {
        
    		this.name = name;
    		this.hp = hp;
    	}
    	public void fuhuo(heros h) {
        
    		h = new heros("提莫",383);
    	}
    	public static void main(String args[]) {
        
    		heros a =new heros("德玛",383);
    		a.hp-=400;
    		a.fuhuo(a);
    		System.out.println("提莫的血量为：" + a.hp);
    	}
    }

答案是：-17