JAVA类和对象；类的定义

类的定义

JAVA类和对象；类的定义

public class People {
//1. 属性 -> 实例变量/成员变量
private String name;
private int age;
//3. 构造函数初始化成员变量
public People(String name,int age){// this 指向当前对象
this.name = name;
this.age = age;
}

//2. 行为 - > 实例方法/成员方法
public void eat(){
System.out.println(this.name + "吃饭");
}
public void hitBall(){
System.out.println(this.name + "打球");
}
}

//调用

public class Test {
    public static void main(String[] agrs){
        //实例化
      People p=new People("fg",38);
//行为
      p.eat();
      p.hitball();
    }
}

例题

JAVA类和对象；类的定义

public class Car {
    //属性
    String name;
    String color;
    String carid;
    //实例化；
    public Car(String name,String color,String carid){
        this.name = name;
        this.carid=carid;
        this.color=color;
    }
    //启动方法
    void start(){
        System.out.println(name +" "+ carid +" "+color+" "+"start");
    }
    //停止方法
    void stop(){
        System.out.println(name +" "+ carid +" "+color+" "+"stop");
    }
}

//调用

public class Test {
    public static void main(String[] agrs){
        //实例化
        Car car1=new Car("AE86","黄色","sb666");
        Car car2=new Car("benz","深海色","fgnb222");
        //行为
        car1.start();
        car2.start();
        car1.stop();
        car2.stop();
    }
}

运行结果

JAVA类和对象；类的定义