java - 错误: variable might not have been initialized

Question

收到错误:

Pay.java:81: error: variable hourlyWage might not have been initialized JOptionPane.showMessageDialog(null, hourlyWage);

以下代码。声明了 double hourlyWage，这些语句位于 main 参数内。没看到我错过了什么，是吗？

if(skillInt == 1){
    hourlyWage = 17.00;
} else if(skillInt == 2){
    hourlyWage = 20.00;
} else if(skillInt == 3){
    hourlyWage = 22.00;
}
JOptionPane.showMessageDialog(null, hourlyWage);

Answer 1

消息指出，也许(如果 skillInt 不在 {1, 2, 3} 中)您使用未初始化的变量 (hourlyWage)。首先用一些值初始化它:

hourlyWage = 0;
if (skillInt == 1)
    //...

或添加else block :

//...
else if (skillInt == 3)
    hourlyWage = 22.0;
else
    hourlyWage = 0;

如果 skillInt 的唯一可能值是 {1, 2, 3}，那么您可能想移动第三个 if阻止仅 else :

//...
else {
    hourlyWage = 22.0;
}

顺便说一句，更漂亮的方法是 switch运算符:

switch (skillInt) {
    case 1 : hourlyWage = 17.0;
        break;
    case 2 : hourlyWage = 20.0;
        break;
    case 3 : hourlyWage = 12.0;
        break;
    default : hourlyWage = Double.POSITIVE_INFINITY;
}