java day07

使用java写一个简单的面向对象类的例子

编写一个电脑类，u盘类，光驱类，显示器类，电源类，电源一旦关闭，则内存无法访问

CDROM类

//光驱类
public class CDROM
{

    public void  cdromopen()
    {
        System.out.println("光驱打开");

    }
    public void cdromclose()
    {

        System.out.print("光驱关闭");

    }

}

Power类

package test25;
//电源
public class Power
{
private boolean on;
private int div;//电流
public boolean on()
{
return on;
}
public void on(boolean on)
{
	this.on=on;

}
public int getdiv()
{
return div;
}
public void setdiv(int div)
{
	this.div=div;

}

}

　computer类

//电脑
public class computer
{
private Power power;
private CDROM cdrom;
public Power getPower()
{
	return power;
}
public void setPower(Power power)
{
	this.power = power;
}
public CDROM getCdrom()
{
	return cdrom;
}
public void setCdrom(CDROM cdrom)
{
	this.cdrom = cdrom;
}
public void poweron()
{
getPower().on(true);
}
public void poweroff()
{
getPower().on(false);
}
public void oopencdrom()
{
if(getPower().on())
{
	getCdrom().cdromopen();

}
else
{
System.out.println("没开电源");
}

}
public void closeecdrom()
{
if(getPower().on())
{
	getCdrom().cdromclose();
}
else
{
System.out.println("没开电源");
}

}

public static void main(String[] args)
{
computer c1=new computer();
CDROM cr1=new CDROM();
Power power=new Power();
power.setdiv(5);
power.on(true);

c1.setCdrom(cr1);
c1.setPower(power);

c1.poweron();
c1.oopencdrom();
c1.closeecdrom();
c1.poweroff();
c1.oopencdrom();
}

}

　　最终打印结果为

光驱打开
光驱关闭

没开电源

通过上述列子了解了面向对象的基本内容，未来还很长  继续努力吧