Finding Greatest Common Divisor Of 2 Integers?

Oct 16, 2014

After learning about Euclid's Algorithm for finding the greatest common divisor of 2 integers, I decided to make a demo program in Java.

public static int gcd(int number1, int number2) {
int num1 = number1;
int num2 = number2;
if(number1 < number2){

[Code] .....

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Loop / Boolean - Find Greatest Common Divisor Of Two Integers

Sep 25, 2014

In attempting to find the greatest common divisor (gcd) of two integers, n1 and n2, whereas k is a possible gcd and gcd is initialized to 1, the following code has been entered:

for (int k = 2; k <= n1 && k <= n2; k++) {
if ( n1 % 2 == 0 && n2 % 2 == 0)
gcd= k;
}

When asked to change the previous line of code to this:

for (int k = 2; k <= n1 / 2 && k < n2 / 2; k++){

the questions states this revision is wrong and to find the reason.....well, I've changed it, entered "3" (per the answer key) for n1 and n2....

now I can see logically where k (2 in this example) is not <= n1/2, which is 3/2 or 1, since we're dealing w/integers, yet when I compile and run, my answer is indeed, gcd = 1. However, since this is a Boolean expression where && is being used, since the first portion evaluates to "false", the 2nd portion isn't executed and thus my result of 1?...... loops are throwing me for one, for sure....

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Recursive Method - Calculate Greatest Common Divisor Using Euclidean Method

Apr 29, 2014

Consider the following recursive method that calculates the greatest common divisor using Euclidean method.

PHP Code:

public static int GCD ( int x , int y )
{
    if ( y == 0 )                        
        return x;
    else if ( x >= y && y > 0)
        return GCD ( y , x % y );
    else return GCD ( y , x );  


Trace the above method for x=32 and y=46

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Method To Take Array Of Integers And Rearrange Numbers From Least To Greatest Using For Loops

Apr 22, 2014

I'm making a method to take an array of integers and rearrange the numbers from least to greatest, using for loops.

I'm getting the error "java. lang. ArrayIndexOutOfBoundsException: 8,

Portion of the ArrayMethods class with the sorting method

Java Code:

public static Integer[] sortArray (Integer[] a)
{
int swap;
for (int i = 0; i < a.length; i++)

[code]....

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Finding Most Common Character In A String Using For Loop

Feb 7, 2007

import javax.swing.*;
public class mostFrequent{
public static void main(String args[]){
char index;
String s;
s = JOptionPane.showInputDialog("Enter String here");
int currFrequency = 0;
for(index = 0; index<s.length(); index = index++){
int i = 0;
for(i = 'A'; i<='Z'; i++){
if(i==s.charAt(index)){
currFrequency = currFrequency + 1;
}
}
}
System.out.println("end");
}
}
//my code so far

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Feb 7, 2015

I have a problem where I have to create random integers from 1 to n + 1. When the array is displayed I have to find the missing integer from the values that are displayed and show that value. I have to use O(n^2) and O(n) operations. I have created this code so far but I cannot figure out how to make my values display n + 1. It is only displaying values 1, 2, 3, 4 and 5 in random order. I also cannot figure out how to find the missing value. I have created a boolean displayed statement but can't determine how to use it in this code.

=Java
import java.util.Random;
public class Task6
{
public static void main(String[] args)
{
int[] numbers = new int[7]; //create array of numbers
Random random = new Random();
boolean displayed = false; //boolean value to determine if number was displayed

[code].... 

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Putting List In Sorted Order (Least To Greatest)

Feb 14, 2015

I am trying to make a code that takes a list and puts the list in sorted order (least to greatest).

public class SortedIntList {
static final int capacity = 10;
private int [] data;
private boolean unique;
private int size;
public SortedIntList(){
size =0;
data = new int [10];

[Code] ....

Here what the code produces.

Testing SortedIntList()
error when adding these values to list: 4 6 4
list should = [4, 4, 6]
actual list = [4, 6, 4]
was working properly prior to adding last value of 4

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Sorting Arrays - Order From Greatest To Smallest Based On Frequency

Feb 12, 2014

These are all arraylists and not arrays

I have currently two arrays.

Java Code:

String[] chunks = {"a","b","c"};
int[] freq = {2,4,3}; mh_sh_highlight_all('java');

I am looking for a way to order these from greatest to smallest based on frequency.

The resulting arrays should be:

Java Code:

chunks = {"b","c","a"};
freq = {4,3,2}; mh_sh_highlight_all('java');

Because b is most frequent, and a is least frequent.

One way I can think of doing this is a two dimensional String array

Java Code: String[][] fullHold = {{"b","c","a"},{"4","3","2"}}; mh_sh_highlight_all('java');

Then sort based on the character values of the second row.

How can I sort a two dimensional array based on a single row (where it will rearrange the other rows in accordance).

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JOption Pane - Output Number With Greatest Value From User Input

Nov 7, 2014

Using JOptionPane,ask for 10 numbers from the user.Use an array to store the values of these 10 numbers.Output on the screen the number with the greatest value.

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Jun 29, 2014

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May 12, 2014

Which of these is not a real differentiator for programming languages:

a) Object-oriented / Process-Oriented
b) Interactive / Automated
c) Interpreted / Compiled
d) Strongly-Typed / Weakly-Typed
e) All of the above
f) B and C
g) B and D

Almost all support OOP, Interactive/Automated, Interpreted/Compiled but not sure about Strongly typed/Weakly typed.

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Apr 6, 2015

I have two ArrayLists and I want to compare them for common elements, and based on the result I want to update the first Arraylist to only have these elements. sort of like the opposite of RemoveAll() which removes elements in common and keep the ones that are unique. so far I thought of using for loop and .contains() in case it was fault,element not present, remove from list. but I was wondering
in what other ways, perhaps APIs i can use to do that?

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Find Common Elements In Collection?

Mar 19, 2014

I need to create an algorithm that finds the common element(s) in all arrays that has a signature of public Comparable[] findCommonElements(Object[] collection) that has an efficiency of at most O(knlogn), uses a query array, and accepts as input a collection of arrays. I am aware my time would be better spent learning how to use array lists and hash sets, but I am supposed to use concepts already covered, and these have not been.

I feel like this code should work, but it is returning null for the array of common elements. Which means it obviously is not working correctly. I am also likely going to need implementing the sort algorithm, but I wanted to get the part of finding the common elements set first.

public class CommonElements2<T extends Comparable<T>>
{
Comparable[] tempArr;
Comparable[] common;
Comparable[] queryArray;
/*
sort algorithm goes here
*/
public Comparable[] findCommonElements(Object[] collections)

[code]....

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Mar 16, 2015

I have developed a web portal using jsp and struts 2. I have approximately 10 JSP pages which looks exactly the same and have two text areas and two hidden fields. All 10 pages are exactly the same except for hidden field value. Can't i have a single common jsp page. How can i achieve it. A sample page i am attaching...

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ page pageEncoding="UTF-8"%>
<%@ page language="java"%>

[Code]....

As this is an Assignment page so hidden field value is assignment. If the page is OBJECTIVEs then value will be OBJECTIVE.

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Sep 17, 2014

i need to find common String between to Strings :

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Customer Name 2: Joseph Smith, MD.

I need to search the string for a match, in this example "Smith"

Example 2:
Customer Name1: New York Market Place
Customer Name 2: NY Marketplace

I need to search the string for a match, in this example Market place

Example 3:
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Customer Name 2: Corner Deli

I need to search the string for a match, in this example Deli Corner

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May 14, 2015

I am using the following regex - [a-zA-Z0-9]{9,18} which means I can use alphabets and numbers with minimum length as 9 and maximum length as 18.It should not take special characters.

It takes values like ADV0098890 etc. but it is also taking ADV0098890[] which is wrong.
 
How can I prevent that ?

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Feb 5, 2015

when a new object is created in Java it follows the idiom:

Object obj = new Object();
where the Object() constructor matches the object type Object.

But what if it doesn't? I understand from the Oracle Docs on creating objects and polymorphism that the constructor must be in that object's class or one of its subclasses. However, suppose we wanted to declare a new stack. My first instinct would be:

Stack s1 = new Stack();
But I assume it's valid to do it this way, too:

Object s2 = new Stack(); // Is there a difference here? What are we really saying about s2? I'm guessing s2 is simply an empty stack, but only has access to the Object class methods? I'm not sure why someone would ever do this, but I want to solidify my understanding of the Java hierarchy. Are there really any circumstances where someone would use a subclass's constructor when creating a new object?

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Aug 18, 2014

I have two different "business objects", and they have multiple attributes in common(around 25 I believe, all of which are simply a String). Basically, these objects are used for documentation purposes on the same file.

The program can choose to update a given Document at any point in time, even if changes haven't been made to existing version. So what I'm trying to do, is check to see if these attributes differ any between the two files(the exisitng copy, and the new request). If so, I'll update...else I simply throw out the request. The workload can be rather intense at times so I don't want to bog down the system anymore then necessary.

Simply pulling down every attribute for each and comparing seems like a lot of overhead, any more efficient way to achieve these results?

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Jul 16, 2013

I have a small problem to solve by which I would like to merge 2 sorted maps into 1.

Map A
-------
Keys, Values
1, A
2, B
3, C
4, D
5, E

Map B
-------
Keys, Values
1, 10
2, 20
3, 30
4, 40
5, 50

Final Map should look like:

Keys, Values
A, 10
B, 20
C, 30
D, 40
E, 50

The final map would have all the values from Map A as a key and the values from Map B as values in the Final Map. Is there a way to do this using Java?

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Jan 31, 2015

I have done one program, that calculates the Least Common Multiple. The idea is to use WindowsBuilder on Ecplise in order to run it in a separate window. But when I started nothing happens. The code is:

import java.awt.BorderLayout;
import java.awt.EventQueue; 
import java.unit.Scanner;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

[Code] ....

Just wondering what could I do to make it happen. One thing came up on my mind - this is that need to connect the button with the function of the method, but still not sure will work.

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1) I need a common template that has 4 parts, Header, Footer, Menu, Content
2) The header, footer and menu are to be in a separate files of which are called from the main template
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4) The menu has to change the content section only

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This is the code I have currently.

Index (Main Template)
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:h="http://xmlns.jcp.org/jsf/html">

[Code] .....

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Jan 29, 2014

"What happens if you modify the common object references in these lists, myArrList and urArrList ? We have 2 cases here: In the first one, you reassign the object reference using either of the lists. In this case, the value in the second list will remain unchanged.In the second case, you modify the internals of any of the common list elements - in this case, the change will be reflected in both lists."

I have written the following code, which tests the first case mentioned above, and i get the output as expected: myarrList remains unchanged. How can i test the second case ? My thoughts are ....'second case is untestable the following code, because String is immutable. I need to use StringBuilder or something else to write code for test of second case mentioned'.

ArrayList<String> myarrList = new ArrayList<>();
myarrList.add("one");
myarrList.add("two");
ArrayList<String> urarrList = new ArrayList<>();
urarrList.add("three");
urarrList.add("four");
System.out.println("ArrayLists setup");

[code]....

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Dec 17, 2014

My program is user input 20 char and the program will print the most common. So I use another int arr which count the number appears in the original array. i know its not so Effective but I don't know why it run but it stop in the middle. I got this code :

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 20
at Ex2.common(Ex2.java:39)
at Ex2.main(Ex2.java:23)

import java.util.Scanner;
class Ex2 {
public static void main(String[] arg) {
Scanner reader = new Scanner (System.in);
char[] arr=new char[20];
System.out.println("Please enter 20 chars:");
for (int i=0;i<20;i++)

[Code] ....

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Dec 3, 2014

I have assigned random numbers to an 2D array, and I had to write a method that prompts the user for a number between 100 and 200. If that number is in the array, it should return 1. If not, 0. It only stays 0 though, even when the number matches one of the numbers in the array.

public static int Findit(int[][] numbers, int guess) {
int Findit = numbers[0][0];
int i = 0;
int x = 0;
boolean found = false;
for(i=0;i<numbers.length;i++)

[Code] ....

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import de.uos.fmt.musitech.data.score.NotationSystem;
import de.uos.fmt.musitech.data.score.NotationVoice;
import de.uos.fmt.musitech.data.score.ScoreNote;
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import de.uos.fmt.musitech.data.structure.Note;
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import de.uos.fmt.musitech.data.structure.linear.Part;
import de.uos.fmt.musitech.score.mpegsmr.Attributes;
import de.uos.fmt.musitech.utility.math.Rational;

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Finding GCF Of Two Numbers

Nov 18, 2014

I have been struggling to find out what to change to allow my code to find the GCF of two numbers. The instance variable in the class is num, so I need to find the GCF of a and num. It works for the example problem of 25 and 15, returning 5, however it will not work for other problems.

public int findGCD(int a)
{
int result = 0;
int newNum = num;
if ((a > num) && (a % num != 0))

[Code] .....

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