Java开关-各种条件运算符

Question

我发现了一些“有点”相关的问题，但是我不确定我的需求已经完全满足了这些问题。 因此，我要执行的操作是使用SWITCH / CASE清理以下IF / ELSE IF语句。 有没有办法在Java开关中使用多个条件运算符，还是严格来说是布尔值？

int alSize = Integer.parseInt(size);

if (alSize == 7 && (alType == 1 || alType == 3)){
disp = 0.12;
}else if (alSize == 9 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 0.27;
}else if (alSize == 9){
disp = 0.21;
}else if (alSize == 11 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 0.47;
}else if (alSize == 11){
disp = 0.41;
}else if (alSize == 12 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 0.75;
}else if (alSize == 12){
disp = 0.64;
}else if (alSize == 14 &&( alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 1.10;
}else if (alSize == 14){
disp = 0.96;
}else if (alSize == 16 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 1.60;
}else if (alSize == 16){
disp = 1.40;
}else if (alSize == 18 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 2.60;
}else if (alSize == 18){
disp = 2.30;
}else if (alSize == 22 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 4.0;
}else if (alSize == 22){
disp = 3.60;
}else if (alSize == 30 && (alType == 1 || alType == 3 || alType == 4 || alType == 5 )){
disp = 9.9;
}else if (alSize == 30){
disp = 9.2;
}

Answer 1

正如Kon所说，您不能将其简化为一个非常简单的开关/盒，但是您可以执行以下操作：

 boolean typeIs1345 = (alType == 1 || alType == 3 || alType == 4 || alType == 5);

    switch (alSize)
    {
        case 7:
            if (alType == 1 || alType == 3)
                disp = 0.12;
            break;
        case 9:
            disp = typeIs1345 ? 0.27 : 0.21;
            break;
        case 11:
            disp = typeIs1345 ? 0.47 : 0.41;
            break;
        case 12:
            disp = typeIs1345 ? 0.75 : 0.64;
            break;
        case 14:
            disp = typeIs1345 ? 1.1 : 0.96;
            break;
        case 16:
            disp = typeIs1345 ? 1.6 : 1.4;
            break;
        case 18:
            disp = typeIs1345 ? 2.6 : 2.3;
            break;
        case 22:
            disp = typeIs1345 ? 4.0 : 3.6;
            break;
        case 30:
            disp = typeIs1345 ? 9.9 : 9.2;
            break;
    }
}

哪个比较干净

Answer 2

case子句中只能有一个表达式。 因此，不能，您无法以自己想像的漂亮方式做到这一点。

请参阅有关开关的Javadocs

您可以做的最接近的事情是：

switch (value)
    {
        case 1:
        case 2:
             //Operation if value is 1 or 2
        break;
    }