2.带有状态机的机器

package stateMachine;
/**
* 机器类，包含多种状态，处理流程
* @author seacean
* @date 2013-8-29
*/
public class Machine {
//机器本身包含所有的状态机
private State soldOutState;
private State noQuarterState;
private State hasQuarterState;
private State soldState;
private State state; //机器的当前状态
private int count = 0;//机器中当前糖果的数量
/**
* 初始化机器，引入所有的状态机，初始化糖果数量，初始化机器状态
* @param count
*/
public Machine(int count) {
this.soldOutState = new SoldOutState(this);
this.noQuarterState = new NoQuarterState(this);
this.hasQuarterState = new HasQuarterState(this);
this.soldState = new SoldState(this);
this.count = count;
if (this.count > 0) {
this.state = noQuarterState;
}
}
/**
* 释放糖果时的内部处理程序
*/
public void releaseBall() {
System.out.println("a gumball comes rolling out the solt...");
if (count > 0) {
count -= 1;
}
}
public void insertQuerter() {
state.insertQuarter();//加入硬币
}
public void ejectQuarter() {
state.ejectQuarter();
}
public void turnCrank() {
state.turnCrank();
state.dispense();
}
public State getSoldOutState() {
return soldOutState;
}
public State getNoQuarterState() {
return noQuarterState;
}
public State getHasQuarterState() {
return hasQuarterState;
}
public State getSoldState() {
return soldState;
}
public State getState() {
return state;
}
public int getCount() {
return count;
}
public void setState(State state) {
this.state = state;
}
}
　　3.下面是状态机的一些实现类
package stateMachine;
/**
* 机器处于没有投硬币的状态
* @author seacean
* @date 2013-8-29
*/
public class NoQuarterState implements State {
private Machine machine;
public NoQuarterState(Machine machine) {
this.machine = machine;
}
@Override
public void insertQuarter() {
System.out.println("please insert a quarter!");
machine.setState(machine.getHasQuarterState());
}
@Override
public void ejectQuarter() {
System.out.println("please insert a quarter!");
}
@Override
public void turnCrank() {
System.out.println("please insert a quarter!");
}
@Override
public void dispense() {
System.out.println("please insert a quarter!");
}
}

 

package stateMachine;
/**
* 机器处于有硬币，有糖果，没有摇动的状态
* @author seacean
* @date 2013-8-29
*/
public class HasQuarterState implements State {
private Machine machine;
public HasQuarterState(Machine machine){
this.machine=machine;
}
@Override
public void insertQuarter() {
System.out.println("You can not insert another quarter!");
}
@Override
public void ejectQuarter() {
System.out.println("Quarter returned!");
machine.setState(machine.getNoQuarterState());
}
@Override
public void turnCrank() {
System.out.println("You turned ... ");
machine.setState(machine.getSoldState());
}
@Override
public void dispense() {
System.out.println("No gumball dispensed!");
}
}

本文内容不用于商业目的，如涉及知识产权问题，请权利人联系SPASVO小编(021-61079698-8054)，我们将立即处理，马上删除。