打印机类设计与实例-优快云博客

本文链接：https://blog.youkuaiyun.com/wsbbdbjay/article/details/80173378

本文介绍了一种基于抽象类的打印机类设计模式，并通过针式打印机、喷墨打印机及激光打印机的具体实现进行了演示。此外，还展示了一个简单的测试类来验证不同打印机的行为。

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package page2_149;
/**
* 打印机类
* @author win8
*
*/
public abstract class Printer {

public abstract void print();
}

package page2_149;

/**
* 针式打印机类
* @author win8
*
*/
public class DotMatrixPrinter extends Printer {

@Override
public void print() {

System.out.println("针式打印机正在打印");

}

}

package page2_149;
/**
* 喷墨打印机类
* @author win8
*
*/
public class InkpetPrinter extends Printer {

@Override
public void print() {

System.out.println("喷墨式打印机正在打印");

}

}

package page2_149;
/**
* 激光打印机类
* @author win8
*
*/
public class LaserPrinter extends Printer {

@Override
public void print() {
System.out.println("激光打印机正在打印");

}

}

package page2_149;
/**
* 测试类
* @author win8
*
*/
public class Test {
public static void main(String[] args) {
Printer p = new DotMatrixPrinter();
p.print();
Printer p1 = new InkpetPrinter();
p1.print();
Printer p2 = new LaserPrinter();
p2.print();
}

}

package page2_149;

public abstract class Niuben {
private String name;
private String likedo;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getLikedo() {
return likedo;
}

public void setLikedo(String likedo) {
this.likedo = likedo;
}

public abstract void print();
}

package page2_149;

public class Wang extends Niuben {

public Wang() {
super.setName("王小强");
super.setLikedo("喜欢吃四川菜,练太极拳");

}

@Override
public void print() {
System.out.println("我叫"+this.getName()+","+"我是牛犇的中国朋友,"+"我"+getLikedo()+".");

}

}

package page2_149;

public class John extends Niuben {

public John() {
super.setName("约翰");
super.setLikedo("喜欢吃砒霜,打橄榄球");
}
@Override
public void print() {
// TODO Auto-generated method stub
System.out.println("我叫"+this.getName()+","+"我是牛犇的美国朋友,"+"我"+getLikedo()+".");
}

}

package page2_149;

public class Master {
public Niuben come(int num) {
if(num==1) {
return new Wang();
}else if(num==2) {
return new John();
}
return null;

}

public void serve(Niuben f) {
if(f instanceof Wang) {
Wang w=(Wang)f;
w.print();
}else if(f instanceof John){
John j=(John)f;
j.print();
}
}

}

package page2_149;

import java.util.Scanner;

public class Test2 {
public static void main(String[] args) {
Scanner input =new Scanner(System.in);
System.out.println("招待的是(1,中国朋友 2,美国朋友)");
int num=input.nextInt();
Master m=new Master();
m.serve(m.come(num));
}
}

第五章习题