简单工厂模式UML图形及代码

参考：http://blog.csdn.net/lovelion/article/details/17517213 

简单工厂模式：

//抽象图表接口：抽象产品类  
interface Chart {  
    public void display();  
}  
  
//柱状图类：具体产品类  
class HistogramChart implements Chart {  
    public HistogramChart() {  
        System.out.println("创建柱状图！");  
    }  
      
    public void display() {  
        System.out.println("显示柱状图！");  
    }  
}  
  
//饼状图类：具体产品类  
class PieChart implements Chart {  
    public PieChart() {  
        System.out.println("创建饼状图！");  
    }  
      
    public void display() {  
        System.out.println("显示饼状图！");  
    }  
}  
  
//折线图类：具体产品类  
class LineChart implements Chart {  
    public LineChart() {  
        System.out.println("创建折线图！");  
    }  
      
    public void display() {  
        System.out.println("显示折线图！");  
    }  
}  
  
//图表工厂类：工厂类  
class ChartFactory {  
    //静态工厂方法  
    public static Chart getChart(String type) {  
        Chart chart = null;  
        if (type.equalsIgnoreCase("histogram")) {  
            chart = new HistogramChart();  
            System.out.println("初始化设置柱状图！");  
        }  
        else if (type.equalsIgnoreCase("pie")) {  
            chart = new PieChart();  
            System.out.println("初始化设置饼状图！");  
        }  
        else if (type.equalsIgnoreCase("line")) {  
            chart = new LineChart();  
            System.out.println("初始化设置折线图！");              
        }  
        return chart;  
    }  
}