java工场模式——工厂方法模式

java工厂模式——工厂方法模式

package com.fsti.factory.factorymethod;public interface Output {public final static Integer MAX_CACHE_LINE = 3;void getData(String str);void out();}
package com.fsti.factory.factorymethod;public class Printer implements Output {private String[] printData = new String[MAX_CACHE_LINE];// 用以记录当前需打印的作业数private int dataNum = 0;public void getData(String str) {if (dataNum >= MAX_CACHE_LINE) {System.out.println("输出队列一满，添加失败");} else {printData[dataNum++] = str;}}public void out() {while (dataNum > 0) {System.out.println("打印机打印：" + printData[0]);// 把作业整体前移一位，并将剩下的作业数减一System.arraycopy(printData, 1, printData, 0, --dataNum);}}}
package com.fsti.factory.factorymethod;public class BetterPrinter implements Output {private String[] printData = new String[MAX_CACHE_LINE];// 用以记录当前需打印的作业数private int dataNum = 0;public void getData(String str) {if (dataNum >= MAX_CACHE_LINE) {System.out.println("输出队列一满，添加失败");} else {printData[dataNum++] = str;}}public void out() {while (dataNum > 0) {System.out.println("Better打印机打印：" + printData[0]);// 把作业整体前移一位，并将剩下的作业数减一System.arraycopy(printData, 1, printData, 0, --dataNum);}}}
package com.fsti.factory.factorymethod;public interface OutputFactory {Output getOutput();}
package com.fsti.factory.factorymethod;public class BetterPrinterFactory implements OutputFactory {public Output getOutput() {return new BetterPrinter();}}
package com.fsti.factory.factorymethod;public class PrinterFactory implements OutputFactory {public Output getOutput() {return new Printer();}}
package com.fsti.factory.factorymethod;public class Computer {private Output out;public Computer(Output out) {this.out = out;}public void keyIn(String str) {out.getData(str);}public void print() {out.out();}public static void main(String[] args) {// 客户端代码成功是与被调用对象的实现类分类// 但带来了另一种耦合：客户端代码与不同的工厂类耦合OutputFactory of = null;String type = "better";if (type.equals("better")) {of = new BetterPrinterFactory();} else {of = new PrinterFactory();}Computer c = new Computer(of.getOutput());c.keyIn("工厂模式之");c.keyIn("工厂方法模式");c.print();}}采用工厂方法设计的架构，客户端代码成功是与被调用对象的实现类分类，但带来了另一种耦合：客户端代码与不同的工厂类耦合。