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//æŠ½è±¡½{–ç•¥
abstract class Strategy {
    public abstract void AlgorithmInterface();
}

//å…·ä½“çš„ç–ç•¥ç®—æ³•A
class ConcreteStrategyA extends Strategy{
    @Override public void AlgorithmInterface(){
        System.out.println ("ä½¿ç”¨½{–ç•¥A");
    }
}

//å…·ä½“çš„ç–ç•¥ç®—æ³•B
class ConcreteStrategyB extends Strategy{
    @Override public void AlgorithmInterface(){
        System.out.println ("ä½¿ç”¨½{–ç•¥B");
    }
}

//çŽ¯å¢ƒ
class Context{
    Strategy strategy;
    public Context(Strategy strategy){
        this.strategy = strategy;
    }
    public void contextInterface(){
        strategy.AlgorithmInterface();
    }
    //æ”¹å˜½{–ç•¥
    public void setStratery(Strategy strategy){
        this.strategy = strategy;
    }
}

//‹¹‹è¯•
public class Client{
    public static void main (String[] args) {
        Context c = new Context(new ConcreteStrategyA());
        c.contextInterface();
        //å¯ä»¥å¾ˆæ–¹ä¾¿åœ°æ”¹å˜½{–ç•¥åQŒè€Œä¸å¿…ä¿®æ”¹åŽŸæ¥çš„ä»£ç
        c.setStratery(new ConcreteStrategyB());
        c.contextInterface();
    }
}
/*è¾“å‡ºåQ?br /> ä½¿ç”¨½{–ç•¥A
ä½¿ç”¨½{–ç•¥B
*/

import java.util.ArrayList;

//æŠ½æŽ’åºè±¡½{–ç•¥
abstract class SortStrategy{
    abstract public void sort(ArrayList list);
}

//å¿«æŽ’½{–ç•¥
class QuickSort extends SortStrategy{
    @Override public void sort(ArrayList list){
        System.out.println ("QuickSorted list");
    }
}

//å¸Œå°”æŽ’åº½{–ç•¥
class ShellSort extends SortStrategy{
    @Override public void sort(ArrayList list){
        System.out.println ("ShellSorted list");
    }
}

//å½’åÆˆæŽ’åº½{–ç•¥
class MergeSort extends SortStrategy{
    @Override public void sort(ArrayList list){
        System.out.println ("MergeSort list");
    }
}

//çŽ¯å¢ƒ
class SortedList{
    private ArrayList list = new ArrayList();
    private SortStrategy sortStrategy;

    public SortedList(SortStrategy sortStrategy){
        this.sortStrategy = sortStrategy;
    }

    public void sort(){
        sortStrategy.sort(list);
    }
    //æ”¹å˜½{–ç•¥
    public void setStrategy(SortStrategy sortStrategy){
        this.sortStrategy = sortStrategy;
    }
}

//‹¹‹è¯•
public class StrategyApp {
    public static void main (String[] args) {
        SortedList studentRecords  = new SortedList(new QuickSort());
        studentRecords.sort();
        //æ”¹ç”¨å¸Œå°”æŽ’åº
        studentRecords.setStrategy(new ShellSort());
        studentRecords.sort();
    }
}
/*è¾“å‡ºåQ?br /> QuickSorted list
ShellSorted list
*/