比基盜星球還有2萬公里將要到達我星球入侵。。。
此時的why星球
public class SimpleHero {
public void fight (String condition) {
if (condition == null ) {
return;
}
if ("AgainstTheWind".equals(condition)) {
System.out.println("逆風翻盤策略");
} else if ("DownwindSuppression".equals(condition)) {
System.out.println("順風壓制策略");
} else if ("BalanceInPower".equals(condition)) {
System.out.println("勢均力敵策略");
}
}
public static void main(String[] args) {
SimpleHero simpleHero = new SimpleHero();
simpleHero.fight("AgainstTheWind");
}
}
策略模式UML圖:
public interface Strategy {
public void fight();
}
public class AgainstTheWindStrategy implements Strategy {
@Override
public void fight() {
System.out.println("逆風翻盤策略");
}
}
public class BalanceInPowerStrategy implements Strategy {
@Override
public void fight() {
System.out.println("勢均力敵策略");
}
}
public class DownwindSuppressionStrategy implements Strategy {
@Override
public void fight() {
System.out.println("順風壓制策略");
}
}
public class Hero {
private Strategy strategy;
public Hero(Strategy strategy) {
this.strategy = strategy;
}
public void useStrategem() {
strategy.fight();
}
}
public class Battlegroud {
public static void main(String[] args) {
Hero hero = new Hero(new AgainstTheWindStrategy());
hero.useStrategem();
Hero hero1 = new Hero(new BalanceInPowerStrategy());
hero1.useStrategem();
Hero hero2 = new Hero(new DownwindSuppressionStrategy());
hero2.useStrategem();
}
}
tips :
策略模式優點：滿足開閉原則，當新增策略時，只需要新增策略實現類，方便擴展，避免大量的if..else。
策略模式缺點:客戶端需要知道所有的策略實現類，如果策略比較多的時候，類的數量也會比較多。
當然策略模式的應用不止是舉慄的這些，如果大家希望看些源碼解析的文章，後面給大家安排上，歡迎大家來看我文章，希望大家喜歡，更多精彩關注<Java小咖秀>。