设计模式_2_策略模式

1.策略模式(Strategy)

2.UML类图

3.代码实现

abstract class CashSuper
{
//算法方法
public abstract double acceptCash(double money);
}

public class CashReturn extends CashSuper {

private double moneyCondition = 0.0d;
private double moneyReturn = 0.0d;

public CashReturn(String moneyCondition,String moneyReturn){
this.moneyCondition = Double.parseDouble(moneyCondition);
this.moneyReturn = Double.parseDouble(moneyReturn);
}

@Override
public double acceptCash(double money) {
// TODO Auto-generated method stub
double result = money;
if (money >= moneyCondition) {
result = money - Math.floor(money / moneyCondition) * moneyReturn;
}
return result;
}

}

public class CashNormal extends CashSuper {

@Override
public double acceptCash(double money) {
return money;
}

}

public class CashRebate extends CashSuper {

private double moneyRebate = 1d;

public CashRebate(String moneyRebate){
this.moneyRebate = Double.parseDouble(moneyRebate);
}

@Override
public double acceptCash(double money) {
return money * moneyRebate;
}

}

public class CashContext {

CashSuper cs = null;

public CashContext(String type){

char charType = type.charAt(0);
//char charType = (char)type;
switch (charType){
case 'n':
cs = new CashNormal();
break;
case 'r':
CashReturn cr1 = new CashReturn("300","100");
cs = cr1;
break;
case '8':
CashRebate cr2 = new CashRebate("0.8");
cs = cr2;
break;

}
}

public double getResult(double money){
return cs.acceptCash(money);
}

}

public class strategy {

double total = 0.0d;
public static void main(String[] args) {
CashContext cc = new CashContext('r');
double totals = 0d;
totals = cc.getResult(100 * 300);
total = total + totals;
}
}