Java嵌套If语句-或与！=相比较

Question

String card1="A";
int total=0;
Scanner input_var=new Scanner(System.in);
if (card1=="A"){
    System.out.println("Do you want a 1 or 11 for the Ace?: ");
    int player_ace_selection=input_var.nextInt();
    if ((1|11)!=(player_ace_selection)){
        System.out.println("Please enter a 1 or 11: ");
        int new_selection=input_var.nextInt();
        total=total + new_selection;
    }
    else {
        total=total + player_ace_selection;
    }
}
System.out.println(total);

Answer 1

表达式(111)使用二进制或，生成11:

    11 = 01001
     1 = 00001
(11|1) = 01001

因此，比较与11！=player_ace_selection相同

您应该将代码更改为使用逻辑或，即。

if (1!=player_ace_selection && 11!=player_ace_selection) {
    ...
}