Java 中的 Switch Case 语句是否有任何替代方案?任何好的设计模式?我的 Switch case 语句增加如何避免 [英] Is there Any Alternative for Switch Case Statements in Java ? Any Good Design Pattern ? My Switch case Statement Increasing How to Avoid

问题描述

在代码下面，我写了为每个条件执行 switch-case 语句.现在我正在考虑删除 switch-case 语句并应用一些设计模式来解决这个问题.//主要迭代 - 对于每张纸for (Entry>> entry : testCaseSheetsDataMap.entrySet()) {

Below Code, I wrote to execute the switch-case statement, for each condition. Now I am thinking to remove the switch-case statement and apply some design pattern to overcome this issue. // main iteration - for every sheet for (Entry>> entry : testCaseSheetsDataMap.entrySet()) {

            String sheetNameKey = entry.getKey().trim();
            String testCaseName = testCaseSheetMasterMap.get(sheetNameKey).trim();
            List<Map<String, Object>> executableRowsList = new ArrayList<Map<String, Object>>();
            executableRowsList = entry.getValue();

            CitiMainAuxiliary auxiliary = new CitiMainAuxiliary();

            switch (testCaseName) {

            case "Anonymous Mode Log In":
                auxiliary.runAllLogin(executableRowsList, testCaseName, Constants.ANONYMOUS);
                break;
            case "Login Mode":
                auxiliary.runAllLogin(executableRowsList, testCaseName, Constants.LOGIN);
                break;
            case "Cookied Mode Login":
                auxiliary.runAllLogin(executableRowsList, testCaseName, Constants.COOKIED);
                break;
            case "OBO Mode Login":
                auxiliary.runAllLogin(executableRowsList, testCaseName, Constants.OBO);
                break;

            case "Anonymous Mode Megamenu":
                auxiliary.runMegaMenu(executableRowsList, testCaseName, Constants.ANONYMOUS);
                break;
            case "Login Mode Megamenu":
                auxiliary.runMegaMenu(executableRowsList, testCaseName, Constants.LOGIN);
                break;
            case "Cookied Mode Logon - Megamenu Check":
                auxiliary.runMegaMenu(executableRowsList, testCaseName, Constants.COOKIED);
                break;
            case "OBO Logon - Megamenu Check":
                auxiliary.runMegaMenu(executableRowsList, testCaseName, Constants.OBO);
                break;

            }

        } // end-for testCaseSheetsDataMap

推荐答案

如前所述，您可以使用 polymorphism 和 Strategy 模式.

As was mention you can use polymorphism and Strategy pattern.

例如，您可以创建 Map>>策略并填充它

For example you can create Map<String, BiConsumer<CitiMainAuxiliary, List<Map<String, Object>>> strategies and populate it

strategies.put("Anonymous Mode Log In", (aux, list)-> aux.runAllLogin(list,...))

之后，您可以使用代替 switch 语句strategy = strategy.get(testCaseName);strategy.accept(...)

After that instead of switch statement you can use strategy = strategies.get(testCaseName); strategy.accept(...)

如果您不能使用 Java 8，您可以创建一个接口并使用 Map 而不是 BiConsumer 的映射.也许接口的实现更好，因为在每个特定的类中你都可以初始化你的常量，比如 COOKIED 或 OBO

If you can't use Java 8 you can create an Interface and use Map<String, YourInterface> instead of map of BiConsumer. Maybe the implementation with interfaces is better, because in every particular class you can initialize your Constants, like COOKIED or OBO

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