Head Firstデザインパターン 第2版 ―頭とからだで覚えるデザインパターンの基本

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State

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public class GumballMachine {

State soldOutState;

State noQuarterState;

State hasQuarterState;

State soldState;

State state;

int count = 0;

public GumballMachine(int numberGumballs) {

soldOutState = new SoldOutState(this);

noQuarterState = new NoQuarterState(this);

hasQuarterState = new HasQuarterState(this);

soldState = new SoldState(this);

this.count = numberGumballs;

if (numberGumballs > 0) {

state = noQuarterState;

} else {

state = soldOutState;

}

public void insertQuarter() {

state.insertQuarter();

}

public void ejectQuarter() {

state.ejectQuarter();

}

public void turnCrank() {

state.turnCrank();

state.dispense(); ...