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State pattern, 状态模式，是一种对象行为模式。又称状态对象(Objects for States).
【意图】允许一个对象在其内部状态改变时改变其行为。对象看起来像是改变了它的类。
【类图】如下所示：
【代码】部分代码如下，全部代码可以在 http://code.google.com/p/cyiridiumsitewikineed/source/browse/trunk/src/designpattern/org/iridium/dp/state 查看。
public interface State { void oper1(); void oper2();}public class ConcreteStateA implements State { @Override public void oper1() { System.out.println("state a, oper1"); } @Override public void oper2() { System.out.println("state a, oper2"); }}public class ConcreteStateB implements State { @Override public void oper1() { System.out.println("state b, oper1"); } @Override public void oper2() { System.out.println("state b, oper2"); }}public class Context { private State state; public void oper1() { state.oper1(); } public void oper2() { state.oper2(); } public State getState() { return state; } public void setState(State state) { this.state = state; }}public class Client { public static void main(String[] args) { Context contex = new Context(); State stateA = new ConcreteStateA(); contex.setState(stateA); contex.oper1(); contex.oper2(); State stateB = new ConcreteStateB(); contex.setState(stateB); contex.oper1(); contex.oper2(); }}以上代码，执行 Client.main 后，输出如下内容：
state a, oper1state a, oper2state b, oper1state b, oper2Page updated
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