4.23上机作业

public class Person {
 
    double height;
    int age;
    String name;
 
    public void sayHello() {
        System.out.println("Hello,my name is "+name);
    }
 
}
package www;
 
public class PersonCreate {
 
    public static void main(String[] args) {
        Person p1=new Person();
        p1.age=34;
        p1.height=1.73;
        p1.name="zhangsan";
        p1.sayHello();
        Person p2=new Person();
        p2.age=44;
        p2.height=1.74;
        p2.name="lishi";
        p2.sayHello();
    }
 
}

package fff;
public class fff {
        char color;
        int model;

        biji() {

        }

        biji(char color, int model) {
            this.color = color;
            this.model = model;
        }

        void a() {
            System.out.println("颜色：" + color + "  型号：" + model);
        }

        public static void main(String[] args) {
            biji a = new biji('a', 2020);
            a.a();
        }
    }