public interface IReceiver {//包含两个方法，压缩和解压缩public boolean compress(String source, String to);public boolean uncompress(String source, String to);
}

public class ZipReceiver implements IReceiver{@Overridepublic boolean compress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the Zip compress method");/*** 对文件的具体压缩代码*/return true;}@Overridepublic boolean uncompress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the zip uncompress method");/*** 对文件的具体解压缩代码*/return true;}}public class GzipReceiver implements IReceiver{@Overridepublic boolean compress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the Gzip compress method");return true;}@Overridepublic boolean uncompress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the Gzip uncompress method");return true;}}

public abstract class AbstractCmd {protected ZipReceiver zip = new ZipReceiver();protected GzipReceiver gzip = new GzipReceiver();public abstract boolean execute(String source, String to);
}

public class ZipCompressCmd extends AbstractCmd{@Overridepublic boolean execute(String source, String to) {// TODO Auto-generated method stubreturn super.zip.compress(source, to);}
}public class ZipUncompressCmd extends AbstractCmd{@Overridepublic boolean execute(String source, String to) {// TODO Auto-generated method stubreturn super.zip.uncompress(source, to);}}public class GzipCompress extends AbstractCmd{@Overridepublic boolean execute(String source, String to) {// TODO Auto-generated method stubreturn super.gzip.compress(source, to);}}public class GzipUncompress extends AbstractCmd{@Overridepublic boolean execute(String source, String to) {// TODO Auto-generated method stubreturn super.gzip.uncompress(source, to);}}

public class Invoker {//执行的命令private AbstractCmd command;public Invoker(AbstractCmd command){this.command = command;}public void execute(String source, String to){this.command.execute(source, to);}
}public class Client {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubAbstractCmd command = new ZipCompressCmd();Invoker invoker = new Invoker(command);invoker.execute("c:/windows","D;/zip");}
}

public interface Algorithm{//包含两个方法，压缩和解压缩public boolean compress(String source, String to);public boolean uncompress(String source, String to);
}public class ZipAlgorithm implements Algorithm{@Overridepublic boolean compress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the Zip compress method");/*** 对文件的具体压缩代码*/return true;}@Overridepublic boolean uncompress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the zip uncompress method");/*** 对文件的具体解压缩代码*/return true;}}public class GzipAlgorithm implements Algorithm{@Overridepublic boolean compress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the Zip compress method");/*** 对文件的具体压缩代码*/return true;}@Overridepublic boolean uncompress(String source, String to) {// TODO Auto-generated method stubSystem.out.println("this is the zip uncompress method");/*** 对文件的具体解压缩代码*/return true;}}public class Context{private Algorithm al;public Context(Algorithm al){this.al = al;}public boolean compress(String source, String to){this.al.compress(source,to);}public boolean uncompress(String source, String to){this.al.uncompress(source,to);}
}public class Client{public static void main(String[] args){Context text = new Context(new ZipAlgorithm());text.compress("c:/windows","d:/file");}
}

public class Human {//人生有三种状态童年、成年和老年public static HumanState childState = new ChildrenState();public static HumanState adultState = new AdultState();public static HumanState oldState = new OldState();public HumanState state = null;public void setHumanState(HumanState state){this.state = state;this.state.setHuman(this);}public void work(){this.state.work();}
}public abstract class HumanState {protected static Human human = null;public void setHuman(Human human){this.human = human;}public abstract void work();
}public class ChildrenState extends HumanState{@Overridepublic void work() {// TODO Auto-generated method stubSystem.out.println("童年是最无忧无虑的，在家的港湾的庇护下快乐的成长");//切换到下一个人生状态super.human.setHumanState(Human.adultState);}}public class AdultState extends HumanState{@Overridepublic void work() {// TODO Auto-generated method stubSystem.out.println("成为了社会的中坚力量，有了自己的家庭和事业");super.human.setHumanState(Human.oldState);}}public class OldState extends HumanState{@Overridepublic void work() {// TODO Auto-generated method stubSystem.out.println("一路上收藏点点滴滴的微笑，坐着摇椅和心爱的人慢慢聊");}}public class Client {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubHuman human = new Human();human.setHumanState(new ChildrenState());human.work();     //有状态切换在ChildrenState的work()
        human.work();human.work();}}