java设计模式--工厂方法简单示例

 

package com.utstar.pattern.factorymethod;

public class ExportFile implements Export{
    public void export(String s){
        System.out.println(s);
    }
}

package com.utstar.pattern.factorymethod;

public class ExporDb implements Export{
    public void export(String s){
        System.out.println(s);
    }
}

package com.utstar.pattern.factorymethod;

public class ExportDbOperate extends ExportOperate{
    public Export factoryMethod(){
        return new ExporDb();
    }
}

package com.utstar.pattern.factorymethod;

public class ExportFileOperate extends ExportOperate{
    public Export factoryMethod(){
        return new ExportFile();
    }
}

package com.utstar.pattern.factorymethod;

public interface Export {
    public void export(String s);
}


package com.utstar.pattern.factorymethod;

public abstract class ExportOperate{
    public abstract Export factoryMethod();
    public void operate(String s){
        factoryMethod().export(s);
    }
}

package com.utstar.pattern.factorymethod;

public class TextFactoryMethod{
    public static void main(String args[]){
        ExportOperate test = new ExportDbOperate();
        test.operate("Hello world!");
        test = new ExportFileOperate();
        test.operate("hello world!");
    }
}