工厂模式

package com.jdk7.chapter2.factory;

public class Factory {
    //定义具体的类型，该类型只属于该类
    public static final String SELECTTION_SORT = "SelectSort";
    public static final String BUBBLE_SORT = "bubbleSort";
    public static final String LINEARINSERT_SORT = "linearInsertSort";
    public static final String QUICK_SORT = "quickSort";
    
    //因为这里调用了静态常量SELECTTION_SORT等，所以该方法要为静态的
    public static SortNumber getSortNumber(String id){
        if(id.equalsIgnoreCase(SELECTTION_SORT)){
            return new SelectSort();
        }else if(id.equalsIgnoreCase(BUBBLE_SORT)){
            return new BubbleSort();
        }else if(id.equalsIgnoreCase(LINEARINSERT_SORT)){
            return new LinearInsertSort();
        }else if(id.equalsIgnoreCase(QUICK_SORT)){
            return new QuickSort();
        }else{
            System.out.println("factory中无该类型");
            return null;
        }
    }
}

package com.jdk7.chapter2.factory;

public class FactoryTest {
    public static void printIntArray(int[] array){
        if(array==null){
            return;
        }else{
            for(int i=0;i<array.length;i++){
                System.out.print(array[i]+" ");
            }
        }
        System.out.println();
    }
    
    public static void main(String[] args) {
        int[] array = new int[] {5,8,7,6,1,4,3,2};
        
        System.out.println("===============SELECTTION_SORT===============");
        int[] a = Factory.getSortNumber(Factory.SELECTTION_SORT).sortASCNumber(array);
        printIntArray(a);
        
        System.out.println("===============BUBBLE_SORT===============");
        int[] b = Factory.getSortNumber(Factory.BUBBLE_SORT).sortASCNumber(array);
        printIntArray(b);
        
        System.out.println("===============LINEARINSERT_SORT===============");
        int[] c = Factory.getSortNumber(Factory.LINEARINSERT_SORT).sortASCNumber(array);
        printIntArray(c);
        
        System.out.println("===============QUICK_SORT===============");
        int[] d = Factory.getSortNumber(Factory.QUICK_SORT).sortASCNumber(array);
        printIntArray(d);
    }
}

执行结果：
===============SELECTTION_SORT===============
1 2 3 4 5 6 7 8 
===============BUBBLE_SORT===============
1 2 3 4 5 6 7 8 
===============LINEARINSERT_SORT===============
1 2 3 4 5 6 7 8 
===============QUICK_SORT===============
1 2 3 4 5 6 7 8 

其余类代码详见：http://www.cnblogs.com/celine/p/8290254.html