将变量传递给catch - Java

rideCountFile 必须在try块之前声明才能被catch块访问.

int rideCountFile;
try{
    Scanner input = new Scanner(file);
    rideCountFile = input.nextInt();
    final int[] rideCount = {rideCountFile};
    onCreate2(rideCount);
} catch (FileNotFoundException ex){
    rideCountFile = 0;
    // call onCreate2 again if you wish
    final int[] rideCount = {rideCountFile};
    onCreate2(rideCount);
}

当然,除非你需要rideCountFile在后面的代码中使用你没有包含的内容,否则你在catch块中根本不需要它,所以代码可以简化为:

try{
    Scanner input = new Scanner(file);
    int rideCountFile = input.nextInt();
    final int[] rideCount = {rideCountFile};
    onCreate2(rideCount);
} catch (FileNotFoundException ex){
    onCreate2(new int[] {0});
}