3.类和类关系练习

package computer;

public class Computer {
    private boolean state;
    private int number;
    public Computer(){}
    public Computer(int number){
        this.number = number;
    }
    public int getNumber(){
        return this.number;
    }
    public boolean getState(){
        return this.state;
    }
    public void beOpen(){
        System.out.println(this.number +"电脑被打开");
    }
    public void beUsing(){
        System.out.println(this.number + "电脑被使用");
    }
    public void beClose(){
        System.out.println(this.number + "电脑被关闭");
    }
}

package computer;

public class MachineRoom {
    public void welcomeStudent(Student student){
        String name = student.getName();
        System.out.println("欢迎" + name + "学生进入机房");
        Computer computer = new Computer(1);
        student.useComputer(computer);
    }
}

package computer;

public class Student {
    private String name;
    public Student(){}
    public Student(String name){
        this.name = name;
    }
    public String getName(){
        return this.name;
    }
    public void useComputer(Computer computer){
        System.out.println(this.name+"开始使用电脑");
        computer.beOpen();
        computer.beUsing();
        computer.beClose();
    }
}

package computer;

public class Test {
    public static void main(String[] args) {
        MachineRoom machineRoom = new MachineRoom();
        Student student = new Student("小红"); //此时student是对象属性
        machineRoom.welcomeStudent(student);
    }
}

"C:Program Files (x86)Javajdk1.7.0_71binjava.exe" ...
欢迎小红学生进入机房
小红开始使用电脑
1电脑被打开
1电脑被使用
1电脑被关闭