Is It Correct To Declare A Class Inside Main Method

Jan 21, 2014

I saw an example where an (inner)class is declared inside the main method, this is correct or not and why/when it's reasonable to use?so smth like this

public class myClass()
{
public static void myMethod(myInnerClass obj)
{
if (obj.method())

[code]....

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Can Declare A Class Inside Interface?

May 8, 2013

I have a doubt regarding to java.

Can we declare a class inside an interface?

Ans :yes

But what will be the situation?

I am not getting why it is required...........

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Declare String Inside Of Loop - Use It Outside

Apr 26, 2015

I'm trying to code a little text RPG. I've made a little "personality test", with 4 questions (answers a b c), where every letter stands for a type of personality. The analysis of the result is simple counting of the answers, if you have 3 answers a (4 questions), then a has won. If 2 on a, and 2 on b, a simple Random method shows weather result a or b.

Now... the test should give you a "partner" (imagine the pokemon game with 3 different starter pokemon). I have now 3 string variables, like 3 different partners. They are all declared somewhere outside, but i only need one later.

Like...the test is completed, you have your partner and how can i make now that the program is just showing me my partner? Like...when i type " System.out.println(partner); " (outside of the test loop! ) that i only get the one i got through the test?

I was trying to declare in every loop the partner String with every result. But outside the loop java isn't recognising that String, bcs...ofc...it was declared for the loop. So i had in every if or else if clause a " String partner = anwsA;" and answB and answC, thats why i cant declare them outside.

Short: i need a partner String variable that could have 3 possible results... i jut need one

I'm using Eclipse Luna 4.4

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Error Passing Value Of A Variable From One Class To Main Method Of Another Class

Jan 8, 2014

I've 3 classes.

1. Circle
2. GetInputFromUser
3. testCircle

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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How To Call A Method That Exist Within A Class Into Main Method

Feb 13, 2014

I am just trying to test this array, for a locker combination program that involves classes...but the array is printing out the whacky numbers for the location. When I try to call the method in the main, it does not work. How do I call a method that exist within a class into the main method?

public class locker { 
public static void main(String[] args) {
CombinationLock();

[code]....

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How To Import Class Into Class With Main Method

Mar 3, 2014

Im writing a simple program to understand classes and objects. Basically what I have is a file called Program.java where I have my main method.I have another file called Person.java which I want to use to create Person objects. That person can have a name, email adress, phone number, etc.I put both these files in the same folder.in Program.java my first statement is:

Java Code: import Person.java mh_sh_highlight_all('java');

My problem is that when I compile Program.java i get an error message saying that the package Person.java does not exist.So my question is, when you create a class that you want to use for objects, how do you import that class into your class with the main method so that you can use instances of your other class?

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Calling Method Of A Class From Main Class?

Aug 31, 2014

// Add range to Vehicle.
class Vehicle {
int passengers; // number of passengers
int fuelcap; // fuel capacity in gallons
int mpg; // fuel consumption in miles per gallon

// Display the range.
void range() {
System.out.println("Range is " + fuelcap * mpg);

[Code] ....

I'm compiling it in Eclipse and this continues to show in the console display

Minivan can carry 7. Exception in thread "main" java.lang.NoSuchMethodError: Vehicle.range()V
at AddMeth.main(AddMeth.java:34)

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Performing Method On Instance Inside Abstract Class

Mar 12, 2015

How do I create an instance of a class in a method?

I am a bit rusty whenever I think of instances. I always think of main method and objects when I see instance which gets me confused on what to do when I am not in a main method. The example:

I have a abstract class, School, and inside School I have some methods that must preform some action on an instance. For example, there is a move() method that must move the instance of School. Another method named, personOld(), which returns whether or not an instance of School surpassed some determined age.

How do I do this and create this instance?

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Splitting Up Main Method / Class?

Jan 29, 2014

I've written a program just for the sake of it (to learn) and it seem's like theres quite a lot in the main method that perhaps could be split up into seperate classes. I'm not too sure where should start with this though, or what my thought process should have been as I was writing the program.

import java.util.Scanner;
 public class Loops {
 public static void main(String[] args) { 
int answer = 16; 
Scanner scan = new Scanner(System.in); 
// Question
 System.out.println("What is 4 x 4 ?"); 

[code]...

--- Update ---

here's a version without code comments as they might make it harder to read here -

import java.util.Scanner;
 public class Loops {
 public static void main(String[] args) {
 int answer = 16;
 Scanner scan = new Scanner(System.in);
 System.out.println("What is 4 x 4 ?");
 int userAnswerInt = 0;

[code]...

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Access A Method Of Class From Main

Feb 9, 2014

This time I have to make a Black Jack game ( I guess this is a classic) I have created Three classes for this BlackJack( Main), Card, and Player.

What I am trying to do is put the Give one card to the player and remove it from the deck into a separate procedure because I will be doing this several times during the game.

This is the code I have so far Under the class BlackJack.

Java Code:

package black.jack;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

[Code] .....

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Swing/AWT/SWT :: Non-final Variable Inside Inner Class Defined In Different Method

Aug 9, 2014

this code won't compile because selected row must be declared as final because of it being defined outside the window listener. Is their anyway around this? If I make it final the first time that the variable is called it keeps it starting value until the GUI is closed.

butEdit.addActionListener (new ActionListener () {
@Override
public void actionPerformed (java.awt.event.ActionEvent evt) {
int selectedRow = table.getSelectedRow ();
final String [] values = custTableModel.getRowValues (selectedRow);

[code]....

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Cannot Refer To Non-final Variable Inside Inner Class Defined In Different Method

Apr 3, 2014

Created a java.sql.connection object. Refering those obj inside public void run() { } If i declare as final inside a method, i can't refer those outside method due to scope. Cannot refer to a non-final variable dbConnObj inside an inner class defined in a different method...

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Create Method In Main Class And Use It On Object

Feb 26, 2015

I've been writing classes over and over for school. So I create a class outside of my main class. I create a new constructor and then create objects from my main class. I hope that makes sense. So i use methods in that class to work with the object. So I have an object name I've created <dot> method name. So I can create objects and then use methods from the class, but I'm wondering can I create a method in my main class and use it on that object? I don't understand how to do that.

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How To Call String From Main Method In Different Class

Dec 9, 2014

The following code is located in my main class called InjectionFix. I have another class where I need to call or initiate the string in the code below. How can I achieve this. I tried to create an Object of the class but I cant do this because my other class doesnt contain a main method.How can I get the other class to initiate the code below which is loacted in my main class.
 
public static String escapeDN(String name) {
  StringBuilder sb = new StringBuilder();
  // space or # character at the beginning of a string
  if ((name.length() > 0) &&
        ((name.charAt(0) == ' ') ||
             (name.charAt(0) == '#'))) {

[Code] .....

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Binary Search Tree - Calling FindSmallest Method In Main Class

Nov 3, 2014

How should I call my findSmallest method in the main class.. Here is the code:

public class Tester {
public static void main(String[] args){
try {
BinaryTree<Integer> myTree2 = new BinaryTree<Integer>();
 
myTree2.insert(5);
myTree2.insert(2);
myTree2.insert(7);

[Code] ....

So the question is what kind of parameter I should pass in myTree2.findSmallest()??? Here is my findSmallest method..

public E findSmallest(Node<E> parent){
if(parent.left.left == null){
E returnValue = parent.left.data;
parent.left = parent.left.right;
return returnValue;
} else {
return findSmallest(parent.left);
}
}

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Declare Array Of Parent Class But Instantiate Index To Sub Class Using Polymorphism

Apr 14, 2015

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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Declare A Class That Can Be Used To Represent A Quadrilateral

Jul 16, 2014

2. Declare a class called Quadrilateral that can be used to represent a quadrilateral. What instance variables are required? This class should include the following methods:

• Accessor and mutator methods. Notice that negative and zero lengths should not be accepted.
• A method called isParallelogram that returns a Boolean value indicating if the quadrilateral is a parallelogram.
• A method called isRectangle that indicates if the quadrilateral is a rectangle. This method should invoke the method isParallelogram and return a Boolean value.
• A method called isSquare that returns the Boolean value “true” if the quadrilateral is a square. This method should invoke the method isRectangle and return a Boolean value. URL...

import java.awt.Point;
public class Quadrilateral{
private Point p1, p2, p3, p4;
public Quadrilateral (Point p1, Point p2, Point p3, Point p4) {

this.p1 = p1;
this.p2 = p2;
this.p3 = p3;
this.p4 = p4;
}
}

that is all i got, my professor has never mentioned on anything about quadrilateral,and i have 0 knowledge about this.

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Swing/AWT/SWT :: How To Add Setbounds Inside Static Void Main In Java

Dec 31, 2014

I am making an application in java, inside static void main, i want to customize all buttons, text areas and want to put them on desired location inside application. I have tried to use setbounds but can not use it, how can i use it, or is there any other way or layout to make my application components customized layout.

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Correct Declaration Of Method

Oct 26, 2014

Netbeans tells me it's an illegal start of expression during the initialisation of the interactWithUser method.
public class InvertLetter {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/**
* String mit den Kleinbuchstaben.
*/
final String lowercase = "abcdefghijklmnopqrstuvwxyz";

[Code] ....

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Set Method Return Type Determined Inside Method

Dec 25, 2014

I need to write a method that will consume string representation of Object type and will return one object of this type. How to set return type for the method in this case?

Here is exmaple :

public <?> identifyType(String typeString){
if (typesString.matches("String")){
return new String("");
}else if (typeString.matches("Integer")){
return new Integer(0);
}
//....etc..}

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How To Create Object For Multiple Class Inside Single Class

Apr 22, 2015

How to create object for "class B" and call the "function_B" from other different class D where class D has no connection with class A? Here is my program.

public class A(){
void print(){}
}
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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How To Return Array From A Method / Back Into Main Method That Prints Out Stuff

May 27, 2014

I'd like to know how to return a new array, I wrote in a method below the main method. I want to print the array but system.out.print doesn't work for arrays apparently. What structure i should use?

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Writing A Method That Returns Words Without Four Letters Back To Main Method

May 27, 2014

I have to write a method called censor that gets an array of strings from the user as an argument and then returns an array of strings that contains all of the original strings in the same order except those with length of 4. For example if cat, dog, moose, lazy, with was entered, then it would return the exact same thing except for the words with and lazy.

Currently, my code so far just prints [Ljava.lang.String;@38cfdf and im stuck.

import java.util.Scanner;
 public class censorProgram {
public static void main (String args[]){
Scanner input = new Scanner (System.in);
System.out.println ("How many words would you like to enter?");
int lineOfText = input.nextInt();
 
[Code] ....

I have to make new string array in the method and return words without four letters in the main method

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Random Generator Method Is Not Giving Correct Average?

Aug 4, 2014

Create an array that will store 7 temperatures.

Populate the array with 7 random temperatures from 1 to 100 degrees. (hint use a for loop and a Random number Generator)After the temperatures are in the array, calculate the average of the temperatures in the array.

Print out the average.Print out each temperature in a statement comparing it to the average such as:

The average temperature is 48.94

Temperature 1 is 5.0 and is below average.

Temperature 2 is 67.8 and is above average.

import java.util.Random; 
public class ArrayOfTemperatures
{
public static void main(String[] args) {
// Declare an array
int[] randomtemps = new int[7];
temps[0] = 45;

[code]....

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Why Is Logic Not Correct With Method Public Static Boolean ContainsColor

Feb 12, 2015

Why is the logic not correct with the method public static boolean containsColor(String color, Circle [] ca)? It only returns me only false values.

Java Code: public class Circle {
private double radius;
private String color;
public Circle()
{
radius = 1;
color = "red";

[code]....

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Declaring Class In Main Class - Constructor Cannot Applied To Given Types

Aug 1, 2014

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

constructor xx in class xx cannot applied to given types

This is my java class:

public class trainer extends person{
String classType;
public trainer(String name, String gender, String address, int id, String classType) {
super(name,gender,address,id);
this.classType=classType;

[Code] ....

And this is the way i declared in main class:

trainer tr = new trainer();

And what i want to do is:

tr.toString();

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