1.传统if -else 写法

String nodeModelStr = "";

if (nodeType == NodeType.START){

  StartModel startModel = JSON.parseObject(nodeModelStr,StartModel.class)

}else if(nodeType == NodeType.END){

  EndModel endModel = JSON.parseObject(nodeModelStr,EndModel.class)

}

2.策略模式写法

使用了lambda表示里，map里key是NodeType，value是方法对象Function<String,BaseModel>(方法入参是String类型，返回值类型是BaseModel)

如下示例中nodeModelStr就是方法入参，返回值是BaseModel

private static Map<NodeType, Function<String,BaseModel>> checkModelTypeDispatcher = new HashMap<NodeType, Function<String, BaseModel>>(){{

        put(NodeType.START,nodeModelStr -> JSON.parseObject(nodeModelStr,StartModel.class));

        put(NodeType.END,nodeModelStr -> JSON.parseObject(nodeModelStr,EndModel.class));

}};

Function<String,BaseModel> function = checkModelTypeDispatcher.get(nodeType);

BaseModel baseModel = function.apply(JSON.toJSONString(node));

巴特西

策略模式干掉if-else，switch

1.传统if -else 写法

2.策略模式写法

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