上机练习2 类与对象

课堂练习4：

编写代码模拟手机与SIM卡的组合关系。

要求：

           SIM卡类负责创建SIM卡；

           Phone类负责创建手机；

          手机可以组合一个SIM卡；

          手机可以更换其中的SIM卡。

package PhoneSim;

public class SIM {
	private int sNum; //卡号  
	  
    public int getsNum() {  
        return sNum;  
    }  
  
    public void setsNum(int sNum) {  
        this.sNum = sNum;  
    }  
}

package PhoneSim;

public class Phone {
	private SIM pSIM;   //手机卡  
	  
    public SIM getpSIM() {  
        return pSIM;  
    }  
  
    public void setpSIM(SIM pSIM) {  
        this.pSIM = pSIM;  
    }  
}

package PhoneSim;

public class TestMobileSIM {
	public static void main(String args[]) {  
        Phone phone = new Phone();  
        SIM simOne = new SIM();  
        SIM simTwo = new SIM();  
          
        simOne.setsNum(1234);  
        simTwo.setsNum(9876);  
          
        phone.setpSIM(simOne);  
        System.out.println("手机卡号为:"+phone.getpSIM().getsNum());  
        phone.setpSIM(simTwo);  
        System.out.println("更换手机卡号为:"+phone.getpSIM().getsNum());  
    }  
}

课堂练习5：

package test;

public class CPU {
	int speed;

	public int getSpeed() {
	    return speed;
	}

	public void setSpeed(int speed) {
	    this.speed = speed;
	}
}

package test;

public class HardDisk {
	int amount;

	public int getAmount() {
	    return amount;
	}

	public void setAmount(int amount) {
	    this.amount = amount;
	}
}

package test;

public class PC {
	CPU cpu; 
	HardDisk HD; 
	public void setCpu(CPU cpu) { 
	this.cpu = cpu; 
	} 
	public void setHD(HardDisk hD) { 
	HD = hD; 
	} 
	public void show(){ 
	System.out.println("CPU is "+cpu.getSpeed()); 
	System.out.println("HD is "+HD.getAmount()); 
	} 
}

package test;

public class Test {
	public static void main(String[] args) {
	    // TODO Auto-generated method stub

	    CPU cpu= new CPU();
	    cpu.setSpeed(2200);
	    HardDisk  disk=new HardDisk();
	    disk.setAmount(200);
	    PC pc=new PC();
	    pc.setCpu(cpu);
	    pc.setHD(disk);
	    pc.show();

	}
}