Class Defined Under Another Class - Sorting Elements In Reverse Order

Jul 4, 2014

I have never seen a class defined under another class ....

class pe{
static class pqsort implements Comparator<integer>
public into compare(Integer one,Integer two)
return two-one;
}
}

First I want to know how class pqsort is defined under class pe ....

And how the comparator used in this example is sorting elements in reverse order

View Replies


ADVERTISEMENT

Sorting Arrays In Descending Order With Collections Class

Jun 28, 2014

I am trying to create a java program to sort an array in ascending and descending order. Here is the program I created :

import java.util.Arrays;
import java.util.Collections;
public class ArraySort
{
public static void main(String [] args) {
int [] num = {5,9,1,65,7,8,9};
Arrays.sort(num);

[Code]...

BUT I GET THE FOLLOWING EROOR ON COMPILATION

ArraySort.java:12: error: no suitable method found for reverseOrder(int[])
Arrays.sort(num,Collections.reverseOrder(num));
^
method Collections.<T#1>reverseOrder(Comparator<T#1>) is not applicable

[Code] .....

What's wrong with my program?

View Replies View Related

Access Getter / Setter Of Bean Class Where It Defined As Member In Another Class?

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?

View Replies View Related

Extending Static Inner Class Defined Within Inheriting Class?

Jul 3, 2014

I am working on a project involving a class that has the attributes of one of its inner classes. Now, if possible, I would like to make it so that the inner class is not visible outside of the class. Also, some of the functional mechanics require that the class be an instance of the nested inner class (it extends the inner class). The following code snippet demonstrates the situation.

public class A extends A.B {
public static class B { //ideally I would like this to be private/protected.
}
}

When I try to compile this program, I get the error message "Cyclical inheritance involving A." This error does not make much sense because, since the inner class "B" is static, it requires no instance of "A" (it does not inherit from "A" or uses it). My question is "Is it possible to do something similar to this structure?" I have searched many forums in search of the answer but have not found anything that attempts to explain it. The closest problem that I have found is one relating to the inheritance of a nested inner class from another class. I would like to express that the problem that I am having involves a class defined within the inheriting class.

View Replies View Related

Can A Class Be Defined Inside Interface

Feb 15, 2014

Can a class be defined inside an Interface .

interface Inter{
class x{
public static void main(String[] args){
System.out.println("Hello World!");
}
}
}

View Replies View Related

What Happens To A Static Variable That Is Defined Within A Method Of A Class

Feb 15, 2014

What happens to a static variable that is defined within a method of a class ?

View Replies View Related

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]....

View Replies View Related

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...

View Replies View Related

Array In Reverse Order And Its Sum

Dec 3, 2014

This is how the for loop works for the row,right?

for(int i=array.length-1;i>=0;i--)
{
}

I want to know how the for loop works for the column?

View Replies View Related

Sorting Lists In Employee Class

Feb 5, 2014

A Employee Class where i want to sort there lists one by there salary and one by there name individually as per the requirement ? How we do it?

View Replies View Related

Sorting ArrayList Of A Class According To A Field

Oct 13, 2014

we have an Arraylist<Tweet>, and this class is defined as followe: public class Tweet implements Comparable<Tweet>, Serializable. now if we implement the method comparteTo, then will it be sorted automatically? I want to sort this array by any insert.

View Replies View Related

Java Class For Internal Order

Jan 8, 2015

I am just learning java now i have a problem where i have to run a test order on my internalOrder class from the orderTester class and i,m not sure how to do this ?

This is the code i have for my order class:

public static void testCase8(){
orders ords = new orders ("Pen", 8, -0.5);
System.out.println("Test Case 8:" + "
" + ords.getOrderDetails());

[Code] ....

This is the code for my Internal class

public final static double DISCOUNT = 0.4;
public InternalOrder(String productName,int quantity ){
super(productName, quantity,DISCOUNT);
}
public void printInternalReport(){
System.out.println("Printing internal report ...");
}

Now my orderTest class is passed though orders class if you need that code i will put it up...

View Replies View Related

Java Reverse Order Using Pointers?

Oct 9, 2014

This is what I have to do:Write a program that takes a string of someone's name and prints it out last name first. Your program must use pointers, not array subscripts. You may use the available string manipulation functions if you find an opportunity.

Example:

"George Washington"
"Washington, George"

I am not sure how to reverse the name, I have been looking in my textbook and online and cannot figure it out. This is what I have put together so far, it does not run. At the end it says unnecessary return value.

import java.util.*;
import java.util.Scanner;
public class Test {
public static void main ( String [] args ) {
Scanner sc = new Scanner(System.in); 
System.out.print("Enter name: ");
String name = sc.nextLine(); 
String lastname = "";
String firstname = "";
for(int i = 0; i < name.length(); i++) {
if(name.charAt(i) == ' ')

View Replies View Related

How To Reverse Order Of Words In A Sentence

Nov 29, 2012

I want to write an application that inputs a sentence, tokenizes the words with method split and reverse the words (not the letters)...I am stuck at the last part: how to reverse them...should I use the method reverse(); ?

Here is my code..

import java.util.Scanner;
import java.util.StringTokenizer;
public class ReversedWords {
//execute application
public static void main( String [] args) {
//get sentence

[code]....

View Replies View Related

Reverse Order Array Output

Oct 10, 2014

I'm trying to make this code's output display like a sentence, since right now it displays downward and doesn' look right.

public class ReverseOrder {
public static void main(String[] args) {
String phrase = "The rain in Spain falls mainly on the Plain";
char[] phraseArray;
phraseArray = phrase.toCharArray();
for(int i = phraseArray.length - 1; i >= 0; i--){
System.out.println(phraseArray[i]);
}
} // end main
} // end ReverseOrder class

View Replies View Related

Sorting Dates - Saving Result In Class

May 18, 2014

So, I have two classes (bubble sort and insert sort) which are sorting dates. I need to save their comparings and reallocation of elements.

And I don't know how to do it. The point is if I want save that dates(comparings and reallocation) to Result class i need to create new instances of class in each sorting classes so i can't later do something with that, because I have null in Main class.

To avoid that problem i have tried to make Result class as singleton.. I mean: "public static final Results INSTANCE = new Results();" and then in classes "static Results result = Results.INSTANCE" without constructor and to save for example comparings i had method:

Java Code:

int SetComparings(){
return comparings++;
} mh_sh_highlight_all('java');

But it do not work too, because it overwrites old dates. Is there anyway to do not create instance of class? I don't want to copy whole code because it is too long and cant be unreadable, but i will put you structure of my program:

Java Code:

class BubbleSort{}
class InsertSort{}
class Results{}
class Sorting{} // class with switch to choose which way of sorting use
public class Main{} mh_sh_highlight_all('java');

View Replies View Related

OrderTester - Java Class For Internal Order

Jan 8, 2015

I have a problem where i have to run a test order on my internalOrder class from the orderTester class and I am not sure how to do this. This is the code i have for my orderTester class:

public static void testCase8(){
orders ords = new orders ("Pen", 8, -0.5);
System.out.println("Test Case 8:" + "
" + ords.getOrderDetails());

[Code] ....

this is the code for my Internal class

public InternalOrder(String productName,int quantity ){
super(productName, quantity,DISCOUNT); }
public void printInternalReport(){
System.out.println("Printing internal report ...");
}

Now my orderTest class is passed though orders class and intrenalOrder class if you need that code i will put it up.

View Replies View Related

How To Print TreeMap Values In Reverse Order

Apr 3, 2014

Below codes find the character frquency how to print this in reverse order using comparator or else

public static void main(String arr[]) {
String s="bebeao";
Map<Character,Integer> chars=new TreeMap<Character,Integer>();
for(int i=0;i<s.length();i++) {
char x=s.charAt(i);
Integer count=chars.get(x);
if(count==null)

[Code] .....

View Replies View Related

Print Greetings With Names In Reverse Order And With Punctuation

Apr 10, 2014

Write an application, HiFour that prompt for four names and then prints the greetings, but with the names in reverse order and with punctuation as shown in the example.

Enter four names: Alice Bob Carol Dave

Hi Dave, Carol, Bob, Alice.

View Replies View Related

Order Of Numbers - Reverse Array Program

Apr 23, 2015

import java.util.Scanner;

public class ReverseOrder {
public static Scanner input = new Scanner(System.in);
public static void main(String[] args){
int[] numbers;
double[] reverse;

numbers = readArray();
reverse = reverseOrder(numbers);

[Code] ....

I have to write a program that takes an order of numbers and print the reverse order of those numbers.

the out put i receive is:

How many numbers do you want to enter?
4
Please enter 4 integers separated by a space:
1 2 3 4
Your numbers in reverse order are:[D@1f96302

View Replies View Related

Sorting Array Of Objects Based On One Of Class String Variables

Apr 8, 2014

I have a school assignment that involves me sorting an array of objects based on one of the class String variables. I am using as the title says a simple selection sort method. The problem I'm having is that when I run the program in debug mode, it never seems to enter the if statement in the inner loop. I would like to say I've tried a number of things to figure it out, but honestly I'm just stumped as to why it's not working.

Here is the code:

public static void sortTransactions(Transaction[] oTransaction){// This is the sorting method, obviously it's not done so it currently just prints to screen.
System.out.println("Successful call to sortTransaction()");
String min = "";
int curInd = 0;
Transaction[] temp = new Transaction[1];

[Code] ....

The output when I check to see if the array is sorted verifies that the array never does get sorted.

View Replies View Related

Print Statement Not Printing In Order To Call A Method From Another Class

Mar 17, 2015

I have wrote the necessary program for the class which was : Modify the customer class to include changeStreet(), changeState(), and changeZip methods. Modify the account class to include a changeAddress() method that has street city and zip parameters. Modify the Bank application to test the changeAddress method.

The problem arose when I went to test it. For some reason when it asks "Would you like to modify your account information? (y/n)" it will not allow the user to input anything and thus test the class. Here is my code

Class Customer
import java.util.*;
import java.io.*;
public class Customer {
private String firstName, lastName, street, city,state, zip;

[Code] ....

View Replies View Related

Store String Input In Array And Print In Reverse Order

Apr 5, 2014

I have a college question ask me to write a class StringRevert which does the following:

-prompting user for an interger n
-creating an array of n string
-repeatedly read character string from user input and store them in the array until end of array is reached or user input -quit(quit should not saved in array)
-print the string from array in reverse order, from last enter to first enter.
-assume user always supplie correct input

This is what I've done so far but how to get it working.

import java.util.Scanner;
public class StringRevert {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("enter value of n: ");
int n1 = in.nextInt();
String[] n = new String[n1];

[Code] ....

View Replies View Related

Reverse Double Linked List In Java - Descending Order

Sep 12, 2014

I have the following double linked list and I'm supposed to order it descending (reverse) using the printInReverse() method; since the list orders itself ascending when the numbers are added, how could I order it descending in this method? Here's the code without implementing descending/reversing methods:

package test;
import java.util.Scanner;
public class MyList {
private Scanner userInput;
private Integer selectedOption;
private MyListElement firstElement = null;
private boolean exitRequested = false;

[Code] ....

I tried to declare a previousElement variable but I didn't figure out how I'd do that.

View Replies View Related

Display Contents Of File In Reverse Order - Output To Console

Jun 24, 2014

Create a class that allows the user to select a file and output the contents of the file to the console. Recommend using a text file to display, java files are text files. You may want to put this code in a method to allow you to complete the remainder of this assignment without overwriting your code.

- You should ask the user to enter the full path to your file to make certain you are processing the correct file.

- Modify your code/add a method to display the contents of the file in reverse order. You do not need to reverse the characters on each line but simply output the lines of the file in reverse order.

Hint: read the content of the file into an ArrayList and then traverse the ArrayList.

this is what i go so far.

package classActivity;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
public class Select
{
public static String enterFilePath()

[Code] ....

View Replies View Related

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:

Sorting.mergeSort(friends, 0, friends.length-1);
Sorting.PbubbleSort(friends, 0, friends.length-1);
Sorting.PinsertionSort(friends, 0, friends.length-1);
Sorting.selectionSort(friends, 0, friends.length-1);

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");

[Code]...

View Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved