Question

在我的代码的一部分中，我试图为MacAdress变量（dstMac）赋值。我还有一个名为indexMax的int变量，其值可以为0或1或2（将在我的程序中更改）。

现在我要尝试的是根据indexMax将值分配给dstMac。我的意思是，如果indexMax = 0，则dstMac = value0，如果indexMax = 1，则dstMac = value1，然后... （根据indexMax的值选择变量的名称）

    MacAddress dstMac; 
    MacAddress value0 = MacAddress.of("00:00:00:00:00:01");
    MacAddress value1 = MacAddress.of("00:00:00:00:00:02"); 
    MacAddress value2 = MacAddress.of("00:00:00:00:00:11");
    if (maxvalue > 50){
         dstMac = value%d, indexMax // Just for showing what I'm trying to do, I know that this is wrong
    }

我尝试了类似dstMac = String.format("value%d", indexMax);之类的操作，但收到此错误：

Type mismatch: cannot convert from String to MacAddress

那我该怎么做？

Answer 1

要实现此逻辑，可以使用某种结构来保存mac值，然后从中选择一个。只是一个示例：

List<MacAddress> addresses = Arrays.asList(value0, value1, value2);
MacAddress dstMac = Collections.min(addresses, new  Comparator<MacAddress> {
    public int compare(MacAddress a, MacAddress b) { // some custom logic to choose min mac address, for example
        if (a > b)
            return 1;
        if (a == b)
            return 0;
        return -1;
    }
});

或者您可以简单地对其进行迭代并返回第一个可接受的值：

List<MacAddress> addresses = Arrays.asList(value0, value1, value2);
MacAddress dstMac = selectOne(addresses);
....

MacAddress selectOne(List<MacAddress> addresses) {
for (MacAddress mac : addresses) {
        if (some condition) {
            return mac
        }
    }
    return null; // if there is no acceptable mac address 
}

给MacAddress变量赋值

1 个答案: