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Java problem with Scanner objects...

Posted on 2009-04-02
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362 Views
Last Modified: 2013-12-29
Hi there;

I am taking Brand, Type and Price as input with Scanner class but the problem is the program skips input...

I used debugging feature, no use...I am guessing the problem is from the price which is double...so i created some other Scanner objects...but no joy...Please run the attached code...

Best regards...

package hardware;
 

import java.util.ArrayList;

import java.util.Scanner;
 

public class Hardware {
 

    public static void main(String[] args) {

    String brand;

    String type;

    String wireType;

    double price;

    

    ArrayList a1 = new ArrayList();
 

    Scanner sc1 = new Scanner(System.in);

    Scanner sc2 = new Scanner(System.in);

    Scanner sc3 = new Scanner(System.in);
 

    // Enter the Information of MONITOR

    System.out.println("\n***Enter the Info of MONITOR*** ");

    System.out.println("Enter Brand: ");

    brand = sc1.next();
 

    System.out.println("Enter Type (LCD/CRT):");

    type = sc1.next();
 

    sc1.close();

    System.out.println("Enter Price:");

    price = sc2.nextDouble();

    

    sc2.close();

    a1.add(new Monitor(brand, type, price));
 

    // Enter the Information of MOUSE

    System.out.println("\n***Enter the Info of MOUSE*** ");

    System.out.println("Enter Brand:");

    brand = sc3.next();
 

    System.out.println("Enter Type(OPTIC/LASER):");

    type = sc3.next();
 

    System.out.println("Enter WireType (WIRED/WIRELESS): ");

    wireType = sc3.next();
 

    a1.add(new Mouse(brand, type, wireType));
 

    // Enter the Information of KEYBOARD

    System.out.println("\n***Enter the Info of KEYBOARD*** ");

    System.out.println("Enter Brand: ");

    brand = sc3.next();
 

    System.out.println("Enter Type (BASIC/MULTIMEDIA): ");

    type = sc3.next();

    

    sc3.close();

    a1.add(new Keyboard(brand, type));
 

    int i;

    for(i=0; i<a1.size(); i++)

            System.out.println("\nObject "+i+a1.get(i));

    }
 

}

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Comment
Question by:jazzIIIlove
3 Comments
 
LVL 15

Accepted Solution

by:
fsze88 earned 300 total points
ID: 24049830
sorry, I am no Monitor, Mouse, Keyboard class. unable to debug for you...
could you try to use one Scanner only?
it works fine when I use one Scanner
 

import java.util.ArrayList;

import java.util.Scanner;

 

public class Hardware {

 

    public static void main(String[] args) {

    String brand;

    String type;

    String wireType;

    double price;

    

//    ArrayList a1 = new ArrayList();

 

    Scanner sc1 = new Scanner(System.in);

//    Scanner sc2 = new Scanner(System.in);

//    Scanner sc3 = new Scanner(System.in);

 

    // Enter the Information of MONITOR

    System.out.println("\n***Enter the Info of MONITOR*** ");

    System.out.println("Enter Brand: ");

    brand = sc1.next();

 

    System.out.println("Enter Type (LCD/CRT):");

    type = sc1.next();

 

//    sc1.close();

    

    

    System.out.println("Enter Price:");

    price = sc1.nextDouble();

    

//    sc2.close();

//    a1.add(new Monitor(brand, type, price));

 

 

 

    // Enter the Information of MOUSE

    System.out.println("\n***Enter the Info of MOUSE*** ");

    System.out.println("Enter Brand:");

    brand = sc1.next();

 

    System.out.println("Enter Type(OPTIC/LASER):");

    type = sc1.next();

 

    System.out.println("Enter WireType (WIRED/WIRELESS): ");

    wireType = sc1.next();

 

//    a1.add(new Mouse(brand, type, wireType));

 

 

 

 

    // Enter the Information of KEYBOARD

    System.out.println("\n***Enter the Info of KEYBOARD*** ");

    System.out.println("Enter Brand: ");

    brand = sc1.next();

 

    System.out.println("Enter Type (BASIC/MULTIMEDIA): ");

    type = sc1.next();

    sc1.close();

//    sc3.close();

//    a1.add(new Keyboard(brand, type));

/* 

    int i;

    for(i=0; i<a1.size(); i++)

            System.out.println("\nObject "+i+a1.get(i));

    }

*/ 

  }

}

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0
 
LVL 9

Assisted Solution

by:brunoguimaraes
brunoguimaraes earned 200 total points
ID: 24049901
As fsze88 said, it works with only one Scanner object. I created the missing classes Mouse, Monitor and Keyboard and ran this code with one Scanner and it worked.
package hardware;
 

import java.util.ArrayList;

import java.util.Scanner;
 

public class Hardware {
 

	public static void main(String[] args) {

		String brand;

		String type;

		String wireType;

		double price;
 

		ArrayList a1 = new ArrayList();
 

		Scanner sc1 = new Scanner(System.in);
 

		// Enter the Information of MONITOR

		System.out.println("\n***Enter the Info of MONITOR*** ");

		System.out.println("Enter Brand: ");

		brand = sc1.next();
 

		System.out.println("Enter Type (LCD/CRT):");

		type = sc1.next();
 

		System.out.println("Enter Price:");

		price = sc1.nextDouble();
 

		a1.add(new Monitor(brand, type, price));
 

		// Enter the Information of MOUSE

		System.out.println("\n***Enter the Info of MOUSE*** ");

		System.out.println("Enter Brand:");

		brand = sc1.next();
 

		System.out.println("Enter Type(OPTIC/LASER):");

		type = sc1.next();
 

		System.out.println("Enter WireType (WIRED/WIRELESS): ");

		wireType = sc1.next();
 

		a1.add(new Mouse(brand, type, wireType));
 

		// Enter the Information of KEYBOARD

		System.out.println("\n***Enter the Info of KEYBOARD*** ");

		System.out.println("Enter Brand: ");

		brand = sc1.next();
 

		System.out.println("Enter Type (BASIC/MULTIMEDIA): ");

		type = sc1.next();
 

		sc1.close();

		a1.add(new Keyboard(brand, type));
 

		int i;

		for (i = 0; i < a1.size(); i++)

			System.out.println("\nObject " + i + a1.get(i));

	}
 

}

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0
 
LVL 12

Author Closing Comment

by:jazzIIIlove
ID: 31565774
swift!

The thing is I have stg in my mind that there is a problem with Scanner class while scanning double variables...
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