接口定義類

IinkBox.java

package printerDemo.iface;

public interface IInkBox {

public String getColor();

}

IPaper.java

package printerDemo.iface;

public interface IPaper {

String getSize();

}

接口實現類

A4PaperImpl.java

package printerDemo.impl;

import printerDemo.iface.IPaper;

public class A4PaperImpl implements IPaper{

@Override

public String getSize() {

return "A4";

}

}

B5PaperImpl.java

package printerDemo.impl;

import printerDemo.iface.IPaper;

public class B5PaperImpl implements IPaper{

@Override

public String getSize() {

return "B5";

}

}

ColorInkBoxImpl.java

package printerDemo.impl;

import printerDemo.iface.IInkBox;

public class ColorInkBoxImpl implements IInkBox{

@Override

public String getColor() {

return "紅色";

}

}

核心“業務”類

Printer.java

核心“業務”類

package printerDemo;

import printerDemo.iface.IInkBox;

import printerDemo.iface.IPaper;

public class Printer {

private IInkBox inkBox = null;

private IPaper paper = null;

public void print(String content) {

if(null == inkBox || null == paper) {

System.out.println("墨盒和紙張出現錯誤");

return;

}

String color = inkBox.getColor();

String type = paper.getSize();

System.out.println("以下文字是" + color + "色的");

System.out.println("使用紙張：" + type);

System.out.println("打印內容：" + content);

}

public IInkBox getInkBox() {

return inkBox;

}

public void setInkBox(IInkBox inkBox) {

this.inkBox = inkBox;

}

public IPaper getPaper() {

return paper;

}

public void setPaper(IPaper paper) {

this.paper = paper;

}

}

PrinterTest.java

主函數

package printerDemo;

import printerDemo.impl.A4PaperImpl;

import printerDemo.impl.B5PaperImpl;

import printerDemo.impl.ColorInkBoxImpl;

public class PrinterTest {

public static void main(String[] args) {

Printer printer = new Printer();

printer.setInkBox(new ColorInkBoxImpl());

printer.setPaper(new A4PaperImpl());

printer.print("測試內容");

printer.setPaper(new B5PaperImpl());

printer.print("測試內容");

}

}

總結

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