Using Scanner Class In A Child Or Derived Class?

May 7, 2015

1. I want to use a scanner in my child class so that I may populate my parent class. It won't allow me something about scanner constructor. I posted this issue second which is my child's method Tests

2. I can't call my addTestsAnswers method from main to my child class but can call my child's display method from main.

import java.util.Scanner;
public class Tests extends Assessment{
private String q;
private String a;
private int userInput;
  Scanner scan = new Scanner();
Scanner scn = new Scanner();
Scanner u = new Scanner();
  public void addTestsAnswers(){

[code]....

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Inheritance In Java - Child Class Get Copy Of Methods And Variables Of Parent Class?

Mar 1, 2015

Does child class gets a copy of the methods and variables of parent class?

public class test1 {
public static void main(String a[]) {
Child c = new Child();
c.print();

[Code] ....

why is the output 1?

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Servlets :: Calling DoGet Of Child Class From Service Of Parent Class

May 28, 2014

Regarding the lifecycle of servlet , in headfirst servlet i can find :

You normally will NOT override the service() method, so the one from HttpServlet will run. The service() method figures out which HTTP method (GET, POST, etc.) is in the request, and invokes the matching doGet() or doPost() method. The doGet() and doPost() inside HttpServlet don’t do anything, so you have to override one or both. This thread dies (or is put back in a Container-managed pool) when service() completes.

How can I call the doGet method of the subclass from the superclass. i am not getting this .

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Accessing Parent Class Method Using Child Class Object?

Feb 4, 2015

I want to know is there any way we can call parent class method using child class object without using super keyword in class B in the following program like we can do in c++ by using scoop resolution operator

class A{
public void hello(){
System.out.println("hello");
}
}
class B extends A{
public void hello(){
//super.hello();
System.out.println("hello1");

[code]....

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Creating New Constructor In Child Class Which Is Not In Parent Class

Feb 7, 2014

I've a parent class with a argument constructor like below(a sample code)

public class Parent {
Parent(String name) {
System.out.println(name);
}
public static void main(String[] args) {
}
}

Also I've child.class which extends Parent.class as shown below,

public class child extends Parent {
child(String name) {
super(name);
}
}

Now, I want create/modify the constructor which is in child, by taking "int i" as an input instead of "String name". How can I do that? Run time I want to execute child constructor not a parent constructor.

Condition is: Without making any changes to the Parent class

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Private Members Cannot Be Accessed In Derived Class

Jul 3, 2014

When we say derived class that means copy of base class plus subclass specific implementations. But when it comes to private members it cannot be accessible in subclass scope. Does it mean byte code generated for subclass doesn't has byte code of private members of super class ?

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Accessing Private Field Of Derived Object In Base Class?

Apr 1, 2013

I have this piece of code I wrote a while ago to test something. The issue is accessing a private field of Base class in Base but of a Derived object.

Here is the code:
class Base
{
private int x;
public int getX()

[Code]....

The commented code does not work but casting d to Base does.

Forgot to mention that the compilation error is that x has private access in Base.

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How To Use JFrame In Child Class - Two Extend Calls

Feb 4, 2014

I am working with a program where I am required to use a JFrame in a child class. The only way that I know how to access a JFrame is to do, example (public class Example extends JFrame), but since it is already extending the parent class, I am kind of stuck. I do not think that you can extend two separate classes, so..... I am stuck.

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Getting Scanner Class To Accept Strings

Feb 2, 2014

Basically, I'm just trying to let the user enter the name. It crashes whenever the input isn't an int. Also, here's the bit of code I'm using that has to do with that. I don't feel like putting the entire class, so here's that bit of code:

PHP Code: String yourName = user.nextLine(); mh_sh_highlight_all('php');

Anyway, I just haven't figured out how. Also, the scanner is called user in this class.

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Scanner Class - Can't Seem To Access Methods

May 9, 2014

I have two classes built for this assignment. One with getters, setters and constructor and a test class. The test class works fine up until the point when the user wants to (M)odify an employee that he/she built with the loadEmployee method. What happens is I need to enter multiple "M" inputs before anything pops up, and when something pops up, it's the displayMenu instead of modifyEmployee method. I imagine it has something to do with the amount of sc.nextLine()

import java.util.Scanner; // utilize scanner via console
import java.text.NumberFormat; // allows numbers to be format in form of currency
//Example of "big loop" in main to repeat using a No Trip (0,N) test first
public class EmployeeTest {
// space provided to make code easier on eyes...

[code]...

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Query About Use Of NextLine Method Of Scanner Class

Apr 10, 2014

My code is as follows:

import java.util.Scanner;
public class GetUserInput {
public static void main (String args[]) {
int i;
float f ;
String s;

[code]....

My Query is: input.nextLine() does not wait for user input. Instead it continues execution from next line. But if I move up input.nextLine(); before both input.nextInt(); and input.nextFloat() in the above code, the execution works fine, input.nextLine(); waits for user input. edited code and output are as follows.

import java.util.Scanner;
public class GetUserInput {
public static void main (String args[]) {
int i;
float f ;
String s;

[code]....

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Create And Simulate ATM Interface Using Scanner Class

Sep 28, 2014

I need to create and simulate an ATM interface for my computer programming class using scanner class, if else & switch statements. I've been working on this assignment all day and I'm still no closer to figuring out how to do it. I'm currently working in NetBeans to try and solve it. I have attached the pdf , what I need to do. This is what I have so far:

package bankatmifelse;
//Gator Bank ATM Program
import java.util.Scanner;
public class BankATMIfElse {

[code]...

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Anomaly While Using Scanner Class For Taking Inputs

Feb 1, 2015

There is a problem that I am facing while using the Scanner class for taking inputs from the user. Suppose if I need to take an integer and a String input from the user, and I take the integer input first then the place where the user has to input the String skips and the variable shows a "" nothing on printing it. Suppose in this code snippet

import java.util.Scanner;
public class Test
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter a number");
int n = sc.nextInt();
System.out.println("Enter a word");
String str = sc.nextLine();
System.out.println("Enter integer is " + n);
System.out.println("Entered statement is " + str);
}
}

The output is
Enter a number
13
Enter a word
Enter integer is 13
Entered statement is

I need to know why this happens and how should I avoid it. I've seen that taking the String input first solves the issue but while taking the input in a loop to populate a database the program only lets the user enter the first statement and the following statements are skipped.

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Sep 12, 2014

My code runs and populates an arraylist. However my break statement, while stopping the loop ends up being added to the arraylist. And I'm not sure how to fix this error.

public static void main(String args[]) throws Exception
{
// declaring variables
String input = "";
// creating array list
ArrayList<String> nameList = new ArrayList<String>();

[Code] ....

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Apr 23, 2014

I'm not getting why my program is giving error.

package rockjava;
import java.text.NumberFormat;
import java.util.Scanner;
public class file4 {
public static void main(String[] args)

[Code] ....

Please Input Num of Pods + Num of Keys= 20.5
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextFloat(Unknown Source)
at alijava.file4.main(file4.java:14)

(It is not accepting double values. However working fine for integers.)

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Feb 24, 2015

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E.g..

/* variables in String tag...
ANS_s20Tx12VDstr
ANS_:Tx67MSvis
ANS_zRx11MSctr
...
..
*/

Scanner scan = new Scanner( tag );
int ptr = tag.indexOf( "_" );
ptr++;
if ( Character.toLowerCase( tag.charAt( ptr ) ) == 's' )
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Mar 5, 2015

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Is this possible? Or am I trying to do something thats not possible? Or maybe I've missed something really obvious?

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Feb 18, 2014

Class UserAssessBean{
private String username;
private int userid;
private ArrayList<ModuleBean> module;
--{get/set}--

[Code] ....

How can i access the getters/setters of module bean, when it was returned as array list in UserAssessBean?

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I have a quick polymorphism question. I have a parent class and a sub class that extends the parent class. I then declare an array of parent class but instantiate an index to the sub class using polymorphism. Do I have to have all the same methods in the child class that I do in the parent class? Here is an example of what I mean.

public class ParentClass
{
public ParentClass(....){ }
public String doSomething(){ }
}
public class ChildClass extends ParentClass
{
public ChildClass(....)

[Code] ....

Is polymorphism similar to interfaces where the child class needs all the same methods?

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I am working on a program that simulates a bug moving along a horizontal line, My code works correctly when I test it in it's own class but when I tried testing my constructor and methods in a test class I received an error saying, "package stinkBug does not exist" on lines with my methods. However, stinkbug is not a package.

Java Code:

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/

[code]....

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Jan 8, 2014

I've 3 classes.

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2. GetInputFromUser
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package ABC;
public class Circle {
private double radius;
public double getRadius() {
return radius;

[Code] .....

In the testCircle class, in the line: getRadius = ui1.GetInput();

It's showing the error: The method GetInput(float) in the type GetInputFromUser is not applicable for the arguments ()

And when I do: getRadius = ui1.GetInput(rad);

It's showing the error: rad cannot be resolved

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public class A(){
void print(){}
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class B{
void function_B(){}
}
class C{
void function_C(){}
}

Here, A, B, C are in the same package. But class D is in different package.

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Aug 1, 2014

So i declared a class in main class but it seems there's error when i compile:

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This is my java class:

public class trainer extends person{
String classType;
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super(name,gender,address,id);
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[Code] ....

And this is the way i declared in main class:

trainer tr = new trainer();

And what i want to do is:

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Nov 16, 2014

I am a beginner here at JAVA and I am trying to program a Gratuity Calculator using both interface class and object class but it keeps on compiling with errors saying "cannot find symbol".I tried everything to fix it but it just keeps on stating symbol.

[CODE]
public class GratuityCalculator extends JFrame
{
/* declarations */
 
// color objects
Color black = new Color(0, 0, 0);
Color white = new Color(255, 255, 255);
Color light_gray = new Color(192, 192, 192);
 
[code]....

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