JAVA --类与对象（六）传参

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