《java编程思想》：设计模式（不定期更新）

class Process {
    public String getName(){
        return getClass().getSimpleName();
    }
    Object process(Object input){
        return input;
    }
}

class Upcase extends Process {
    String process(Object input){
        return ((String)input).toUpperCase();
    }
}

class Lowercase extends Process {
    String process(Object input){
        return ((String)input).toLowerCase();
    }
}

public class Strategy{
    public static void process(Process p,Object s){
        System.out.println("Using Process " + p.getName());
        System.out.println(p.process(s));
    }
    public static String s="this is strategy design model!";

    public static void main(String[] args) {
        process(new Upcase(),s);
        process(new Lowercase(),s);
    }
}
输出：
Using Process Upcase
THIS IS STRATEGY DESIGN MODEL!
Using Process Lowercase
this is strategy design model!