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Context.java
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58 lines (50 loc) · 1.22 KB
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package design.strategy;
public class Context {
//持有抽象策略角色的引用，用于客户端调用
private Strategy strategy;
//获得策略类
public Strategy getStrategy() {
return strategy;
}
//设置所需策略
public void setStrategy(Strategy strategy) {
this.strategy = strategy;
}
//根据设置的策略类返回对应的结果
public int getResult(int a,int b)
{
return strategy.strategy(a, b);
}
}
abstract class Strategy {
//定义抽象策略的方法
public abstract int strategy(int a,int b);
}
class AddStrategy extends Strategy {
//定义实现加法的策略方法
public int strategy(int a, int b)
{
return a+b;
}
}
class SubStrategy extends Strategy {
//定义减法的策略方法
public int strategy(int a, int b)
{
return a-b;
}
}
class MultiplyStrategy extends Strategy {
//定义乘法的策略方法
public int strategy(int a,int b)
{
return a*b;
}
}
class DivStrategy extends Strategy {
//定义除法的策略方法，这里为了简单就不考虑除数为零的情况了
public int strategy(int a,int b)
{
return a/b;
}
}