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

public class ConsoleReader {

    Scanner reader;

    public ConsoleReader() {
        reader = new Scanner(System.in);
        //reader.useDelimiter(System.getProperty("line.separator"));
    }

    public int readInt(String msg) {
        int num = 0;
        boolean loop = true;

        while (loop) {
            try {
                System.out.println(msg);
                num = reader.nextInt();

                loop = false;
            } catch (InputMismatchException e) {
                System.out.println("Invalid value!");

            }
        }
        return num;
    }

}

...
} catch (InputMismatchException e) {
    System.out.println("Invalid value!");
    reader.next(); // this consumes the invalid token
}

String line = reader.nextLine();
Scanner sc = new Scanner(line);

public int readInt(String msg) {
        int num = 0;
        boolean loop = true;

        while (loop) {
            try {
                System.out.println(msg);
                String line = reader.nextLine();
                Scanner sc = new Scanner(line);
                num = sc.nextInt();
                loop = false;
            } catch (InputMismatchException e) {
                System.out.println("Invalid value!");

            }
        }
        return num;
    }

public int readInt(String msg) {
        int num = 0;
        try {
            System.out.println(msg);
            num = (new Scanner(System.in)).nextInt();
        } catch (InputMismatchException e) {
            System.out.println("Invalid value!");
            num = readInt(msg);
        }
        return num;
    }

package nzt.nazakthul.app;

import java.util.*;

public class NztMainApp {

    public static void main(String[] args) {
    ReadNumber readObj = new ReadNumber();
    readObj.readNumber();
    }

}

class ReadNumber {
int no;

    int readNumber() {
    Scanner number = new Scanner(System.in);
    int no=0;
    boolean b=true;
    do {

        try {
            System.out.print("Enter a number:t");
            no = number.nextInt();
        } catch (InputMismatchException e) {
            System.out.println("No Number");
            //e.printStackTrace();

            b=false;
        }

    }

    while (b);
    return no;

    }

}