为什么scanner.hasNextInt() 不正确？

如何解决为什么scanner.hasNextInt() 不正确？

这里是if，用于检查scanner.hasNextInt() 发生了什么：

if (scanner.hasNextInt()){
            System.out.println("we");
        }else{
            System.out.println("kill me");
        }

输出总是杀了我，这是为什么？ 如有必要，这里是整个代码：

public class LightBot {
String map[] [];
int crow,ccol,cdir;
LightBot(String fileName,int row,int col,int dir){
    try {
        Scanner scanner= new Scanner(fileName);
        int [] tall=new int[100];
        int i=0;
        FileReader inputFil = new FileReader(fileName);
        BufferedReader in = new BufferedReader(inputFil);
        String s =in.readLine();
        System.out.println("r");
        if (scanner.hasNextInt()){
            System.out.println("we");
        }else{
            System.out.println("kill me");
        }
        while(scanner.hasNextInt()){
            System.out.println("sru gjl g");
            try {
                tall[i++] = Integer.parseInt(s);
                System.out.println("ff");
            }
            catch (NumberFormatException ex) {
                System.out.println("WTF");
                continue;
            }
        }
    }catch (IOException error) {
        System.out.println("error");;
    }


}
public static void main(String args[]){
    LightBot l= new LightBot("test.txt",0);
}

}