对象类型作为参数以及返回值

使用对象类型作为方法的参数

public class Phone {
    String brand; //品牌
    double price; //价格
    String color; //颜色

    //打电话
    public void call(String who){
        System.out.println("给"+who+"打电话");
    }
    //发短信
    public void sendMessage(){
        System.out.println("发短信");
    }
}

public class PhoneTest {
    public static void main(String[] args) {
        Phone phone = new Phone();
        phone.brand = "苹果";
        phone.price = 10000;
        phone.color = "黑色";
        method(phone);
    }
    public static void method(Phone phone){
        System.out.println(phone.brand);
        System.out.println(phone.price);
        System.out.println(phone.color);
    }
}

 

 当一个对象作为参数，传递到方法当中时，实际上传递进去的是对象的地址值

 

 

 

使用对象类型作为方法的返回值

public class Phone {
    String brand; //品牌
    double price; //价格
    String color; //颜色

    //打电话
    public void call(String who){
        System.out.println("给"+who+"打电话");
    }
    //发短信
    public void sendMessage(){
        System.out.println("发短信");
    }
}

public class PhoneTest {
    public static void main(String[] args) {
        Phone phone = getPhone();
        System.out.println(phone.brand);
        System.out.println(phone.price);
        System.out.println(phone.color);
    }
    public static Phone getPhone(){
        Phone phone = new Phone();
        phone.brand = "苹果";
        phone.price = 10000;
        phone.color = "黑色";
        return phone;
    }
}