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if(strategyName == "StrategyA"){
     new StrategyA().methodName();
}else if(strategyName == "StrategyB"){
     new StrategyB().methodName();
}(strategyName == "StrategyC"){
     new StrategyC().methodName();
}

Class Dispatcher{
    private Map<String, Strategy> map = new HashMap<String, Strategy>();

    public void putStrategyMap(String name, Strategy strategy ){
        map.put(name, strategy);
    }

    public void do(String name){
        map.get(name).methodName();
    }
}

Class StrategyClient{
    public static void main(String[] args) {
	Dispatcher context = new Dispatcher();
        context.putStrategyMap("StrategyA", new StrategyA());
        context.putStrategyMap("StrategyB", new StrategyB());
        context.putStrategyMap("StrategyC", new StrategyC());

	context.do("StrategyA");
	context.do("StrategyB");
	context.do("StrategyC");
    }
}