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package mode.State; public abstract class State { protected int x ; public abstract State setX(int x); public abstract String status(); public State(int x) { super(); this.x = x; } } 

package mode.State; class StateOK extends State { public StateOK(int x) { super(x); // TODO 自动生成的构造函数存根 } @Override public State setX(int x) { // TODO 自动生成的方法存根 this.x = x; return x>=42?(new StatusNo(x)):this ; } @Override public String status() { // TODO 自动生成的方法存根 return "OK"; } } 

package mode.State; public class StatusNo extends State { public StatusNo(int x) { super(x); // TODO 自动生成的构造函数存根 } @Override public State setX(int x) { // TODO 自动生成的方法存根 return x<=22?(new StateOK(x)):this; } @Override public String status() { // TODO 自动生成的方法存根 return "NO"; } } 

package mode.State; public class Measure { public String loc = "DL"; private State state = new StateOK(0); public void changeState(int x) { state = state.setX(x); } public void output() { System.out.println("地区："+loc+"\n State:"+state.status()); } } 

package mode.State; public class Client { public static void main(String[] args) { Measure measure = new Measure(); int [] x = {18,22,42,20,45}; for (int i:x) { measure.changeState(i); measure.output(); } } }