java - Java中的数组常量初始化

Question

考虑下面的 java 示例代码，它想要搜索操作中允许的任务

public boolean acceptableTaskForAction(String taskName,String actionName) {


    String[] allowedActions;
    switch (taskName){
    case "Payment" :
        allowedActions = { "full-payment", "bill-payment"};

    case "Transfer" :
        allowedActions = { "transfer-to-other", "tarnsfer-to-own"};

    }

    for (String action : allowedActions){
        if (actionName.equals(action)){
            return true;
            }
    }
    return false;
}

如你所知，上面的代码不会编译为数组常量只能在初始化器中使用

我想过定义不同的参数，这样就可以了

public boolean acceptableTaskForAction(String taskName,String actionName) {


    String[] allowedActionsForPayment= { "full-payment", "payment"};
    String[] allowedActionsForTransfer= { "transfer-to-other", "tarnsfer-to-own"};
    String[] allowedActions={};
    switch (taskName){
    case "Payment" :
        allowedActions = allowedActionsForPayment;

    case "Transfer" :
        allowedActions = allowedActionsForTransfer;

    }

    for (String action : allowedActions){
        if (actionName.equals(action)){
            return true;
            }
    }
    return false;
}

你有没有想到其他的解决办法!？您认为最好的解决方案是什么？

Answer 1

你可以按照你的情况做这样的事情

String[] allowedActions;
switch (taskName){
case "Payment" :
    allowedActions = new String[] { "full-payment", "bill-payment"};
    break;
case "Transfer" :
    allowedActions = new String[] { "transfer-to-other", "tarnsfer-to-own"};
    break;
}

数组常量只能在初始化器中使用，但您始终可以创建一个新的 String[] 并在需要时分配它。