Java BufferedReader.readLine() 不等待用户输入

Question

I am having an issue with my instance of BufferedReader not waiting for the user to input before moving forward.

static BufferedReader in;

public class {
    public static void main(String[] args) {
        try{
            in = new BufferedReader(new InputStreamReader(System.in));
            String input;
            System.out.println("prompt");
            input = in.readLine();
            if(input.equals("Y")){
                //do something
            }else {
                //do something else
            }
        }catch(IOException ioe) {
            ioe.printStackTrace();
        }
    }
}

What happens is I when I run the program, it simply skips over the in.readLine() and throws a null exception at the if statement. I am at a loss on what is happening, as I used the same code for another project that still works.

Thanks!

Answer 1

Found the answer. Using gradle to run the program and my task didn't have the parameter for standardInput = System.in. Still getting used to project building software!

Answer 2

Yes you have to treat the exception, just add this:

public static void main(String[] args) throws IOException {
 
        in = new BufferedReader(new InputStreamReader(System.in));
        String input;
        System.out.println("prompt");
        input = in.readLine();
        if(input.equals("Y")){
            System.out.println("it works !!");
        }else {
            System.out.println("it's not a Y :(");
        }
    }