InputMismatchException not working?

[Jake Cirino]

Here's my code, I wan't the user to enter integers only but this code doesn't seem to be working.

//Modes:
//Null = 0
//Quadratic = 1

import java.util.Scanner;
import java.util.InputMismatchException;

public class Start {
	
	public static int mode = 0;
	private static int nInt;
	private static Scanner input;
	
	public static void main(String args[]){
		menu();
	}
	
	public static void menu(){
		System.out.println("\nWelcome to Homework-Buddy.");
		System.out.println("Please type in a number for the mode you want below:");
		System.out.println("\n1.Quadratic Formula");
		menuAction();
	}
	
	public static void menuAction(){
		input = new Scanner(System.in);
		nInt = input.nextInt();
		
		Thread tMenuAction = new Thread(){
			public void run(){
			try {
				mode = nInt;
				//mode1();
			}catch(InputMismatchException e){
					System.out.println("Unrecognised input or invalid number.");
					
				}
			}
		};
		tMenuAction.start();
	}
	
	public static void mode1(){
		
	}
	
}

The error is at about line 30.

[John Jai]

If you want to catch the Exception, then you have to surround the code that takes the Scanner input. Below is the code that reads the input. You have misplaced your try-catch block.

nInt = input.nextInt();

[Rob Spoor]

You shouldn't catch an InputMismatchException, you should prevent it:

if (input.hasNextInt()) {
    nInt = input.nextInt();
} else if (input.hasNext()) {
    // there is something but not an int; take it away
    // show an error or something
    input.next();
}