Unable To Call / Test All Of The 5 Sorting Methods At Same Time In Main Class
Dec 19, 2014
For reference I am programming Java in BlueJ. I am fairly new to the language and I am having trouble with sorting.
I am trying to call / test all of the 5 sorting methods (at the same time) in the main class. To be specific, the sorted list has to technically outputted 5 times.
I figured out how to call / test Quicksort:
Sorting.quickSort(friends, 0, friends.length-1);
But the others are not working correctly. Specifically these:
For reference, this is the output when it is not sorted:
Smith, John 610-555-7384
Barnes, Sarah215-555-3827
Riley, Mark 733-555-2969
Getz, Laura 663-555-3984
Smith, Larry464-555-3489
Phelps, Frank322-555-2284
Grant, Marsha243-555-2837
This is the output when it is sorted:
Barnes, Sarah215-555-3827
Getz, Laura 663-555-3984
Grant, Marsha243-555-2837
Phelps, Frank322-555-2284
Riley, Mark 733-555-2969
Smith, John 610-555-7384
Smith, Larry464-555-3489
This is the class Sorting, which I should note is all correct:
public class Sorting{
/**
* Swaps to elements in an array. Used by various sorting algorithms.
*
* @param data the array in which the elements are swapped
* @param index1 the index of the first element to be swapped
* @param index2 the index of the second element to be swapped
*/
private static <T extends Comparable<? super T>> void swap(T[] data,
int index1, int index2){
T temp = data[index1];
data[index1] = data[index2];
[Code]...
This is the Main class in which I am supposed to call the sorting methods, SortPhoneList:
public class SortPhoneList{
/**
* Creates an array of Contact objects, sorts them, then prints
* them.
*/
public static void main (String[] args){
Contact[] friends = new Contact[7];
friends[0] = new Contact ("John", "Smith", "610-555-7384");
friends[1] = new Contact ("Sarah", "Barnes", "215-555-3827");
I am trying to make a 2d graphical animation using the java swing classes in order to make a frame. I had a basic version working when all of the code was under the main method, but when I moved some into another method it broke it. With y understanding of java my code should work as I create a variable of the method containing the code and then assign the size and exit button. However this causes many problems such as my BeaconFrame method informing me that it is unused when I have used it. Here is my code:
import javax.swing.*; import java.awt.*; public class BelishaBeacon { public void BeaconFrame() { JFrame frame = new JFrame(); JPanel panel1 = new JPanel();
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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. */
I am to create a Array class then create a Driver class (TestArray) to test all the methods in the Array Class. Here's the code i've written for the Array Class. I just nee developing the TestArray class.
import java.util.Scanner; public class Array { Scanner sc = new Scanner(System.in); private double[] array = new double[]; public void setArray(double[] arr) {
How do I use two constructors and I'm having trouble with using char for gender...
Write a program to test the Person class defined below. Your test program should create two instances of the class (each to test a different constructor) and test each of the methods. You are also required to illustrate the error in trying to access private data members from the client class (for clarity temporarily change the private modifier to public and test again). See screenshots below for sample output.
The screen shots are displayed as:
p1 name = Not Given Age = 0 Gender = U p2 name = Jane Doe Age = 0 Gender = F p1 name = John Doe Age = 25 Gender = M
and
PersonTester.jave:20: name has private access in Person System.out.println("p2 name = " + p2.name + "Age = " + p2.age + "Gender = " + p2.gender); PersonTester.jave:20: age has private access in Person System.out.println("p2 name = " + p2.name + "Age = " + p2.age + "Gender = " + p2.gender); PersonTester.jave:20: gender has private access in Person System.out.println("p2 name = " + p2.name + "Age = " + p2.age + "Gender = " + p2.gender);
3 errors
Here is the class given :
class Person { // Data Members private String name; // The name of this person private int age; // The age of this person private char gender; // The gender of this person
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package labmodule7num57; import java.util.*; public class LabModule7Num57 { // Constructors//
I am trying to pass an object of type Product p to my editProduct method, however trying to call p.getName(); doesn't work and throws a NullPointerException. The same kind of thing works for my displayRecord method (in a different class) and I can call .getName() on Product p, also passed as an argument to that method. Below is my editProduct class. The NullPointerExcepion is being thrown at line 61 (i.e., nameField.setText(p.getName());).
I don't know if I explained right, so here's a line thing of how the classes relate:
And as a side note: adding the line p = new Product(); fixes it and successfully runs the class (including the Save and Quit parts) but obviously I want it to specifically refer to the Product I pass to the method.
I'm asking a question because I don't understand how Product p could possibly be null, because the argument is passed through my DisplayRecord class, which also takes a Product p argument and works. In that class, I have declared Product prod = p; and prod is what I am passing to editProduct.
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public class locker { public static void main(String[] args) { CombinationLock();
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e.g.
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As seen below, both the PrepaidCard constructor and the setCardID method have the ability to set the card ID.
public class PrepaidCard { public PrepaidCard(String id, int token) { cardID = id; tokenBalance = token; } public void setCardID(String id, int token) { cardID = id; tokenBalance = token; } }
Now in this block of code, I can successfully pass the id and token value by calling the setCardID method from the PrepaidCard class. Now I would like to call the PrepaidCard constructor from the PrepaidCard class to pass the id and token value, instead of using the setCardID method.
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i need to sort these runners into time order shortest first, the classes both work i just cant get the method sortRunnerList() to work
Java Code:
public class Runner implements Comparable <Runner> { /* static variables */ private static int nextNumber; // To be added by students in Question 3, part (i)(a) and part(iv)(a) /* instance variables */
private int number; // runner's number private String name; // runner's name
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[code]....
I cannot post the output because the amount of data seems to have crashed the two previous posts I made on this topic due to the size of the problem.
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i wanna to call youtubeviewer from a window by actionlistener and i have tried N times....
Java Code:
public class YouTubeViewer { public YouTubeViewer(){ NativeInterface.open(); SwingUtilities.invokeLater(new Runnable() { public void run() { JFrame frame = new JFrame("YouTube Viewer"); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.getContentPane().add(getBrowserPanel(), BorderLayout.CENTER);
[Code]...
note:necessary library for youtubeviewer is DJ Native Swing. if i call directly by main function,it will work.but if i call from actionlistener cant work (maybe crash).
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[Code] ....
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This is the code I wrote but it obviously doesn't work?
package Practical8;
public class Person{ Private String name; public String format(){ return String.format( "Name: %s", name );
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The method add(TimeSpan) is undefined for the type TEST
Why i get this error?
package timespan; // Represents a time span of hours and minutes elapsed. // Class invariant: minutes < 60 public class TimeSpan { private int hours; private int minutes;
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class test{ public static void main(String [] args){ Scanner input = new Scanner(System.in); //create new Scanner object //for input int number1; int number2;
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1. Is this true this would be called several times? why?
2. If the previous statement was true, how to avoid it, I mean not call the method from a service?