java - if 语句中的多个条件 - first 始终为真

Question

为什么第一个if陈述总是正确的？

private String setDepartment (){
   int code = Integer.parseInt(JOptionPane.showInputDialog("Enter The Department Code:\n" +
            "1:Sales\n" +
            "2:Development\n" +
            "3:Accounting\n" +
           "4:None"));

    /*Why this if statement is always true? How do i solve it? */
    if (code !=1 || code !=2 || code !=3 || code !=4)
    {
        JOptionPane.showMessageDialog(null, "Invalid Number.Enter a number between 1-4");
        setDepartment();
    }

    if (code==1){
        return "Sales";
    }
    else if (code==2){
        return "Development";
    }
    else if (code==3){
        return "Accounting";
    }
    else
        return "";
    }

标签： javaif-statement

Answer 1

替换||为&&：

if (code !=1 && code !=2 && code !=3 && code !=4)