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
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