import java.util.*;
interface State {
    public void insertQuarter();    // 投币
    public void ejectQuarter();     // 退币
    public void turnCrank();       // 按下“出纸巾”按钮
    public void dispense();        // 出纸巾
}
class TissueMachine {
    (1) soldOutState, noQuarterState, hasQuarterState, soldState, state;
    state = soldOutState;
    int count = 0; // 纸巾数
    public TissueMachine(int numbers) { /* 实现代码省略 */ }
    public State getHasQuarterState() { return hasQuarterState; }
    public State getNoQuarterState() { return noQuarterState; }
    public State getSoldState() { return soldState; }
    public State getSoldOutState() { return soldOutState; }
    public int getCount() { return count; }
    // 其余代码省略
}

class NoQuarterState implements State {
    TissueMachine tissueMachine;
    public void insertQuarter() {
        tissueMachine.setState((2));
    }
// 构造方法以及其余代码省略
}


class HasQuarterState implements State {
    TissueMachine tissueMachine;
    public void ejectQuarter() {
        tissueMachine.setState((3));
    }
// 构造方法以及其余代码省略
}

class SoldState implements State {
    TissueMachine tissueMachine;
    public void dispense() {
        if (tissueMachine.getCount() > 0) {
            tissueMachine.setState((4));
        } else {
            tissueMachine.setState((5)); }
    }
}