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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Nov 6, 2014
This code is designed to interpret an array of integers and rearrange it so that the even numbers come before the odd. But it fails when I run it against my test?
public void evensLeft(int[] array) {
int myFun[] = new int[array.length];
int k = 0;
for (int i = 0; array.length-1 > i; i ++) {
if (array[i]%2==0) {
myFun[k] = array[i];
k++;
[Code] ....
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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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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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Mar 7, 2014
I'm trying to generate random 100 numbers, from 0 to 9, in an array using Math.random, but it only outputs 0s which is very confusing to me. Also, I need to be able to count how many different integers there are like 0s, 1s, 2s... 8s, 9s.
Here's my code, I only got as far as the array then got stumped on the counting part.
import java.util.Arrays;
public class countDigits {
public static void main(String[] args) {
//Create random generator and values
int numbers = (int)(Math.random() * 10);
int arrayCount = 1;
[Code] ....
and my results
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
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Nov 8, 2014
So I need to generate 10 random integers in the range 1-20 but i have to store them in an array called numbers. Then I have to call a method called displayArray which displays the contents of the array and for the assignment i have to use a for loop to traverse the array. The method header for the displayArray method is:
public static void displayArray(int[] array)
This is what I have done
public class RandomIntegers {
static int numbers = 0;
public static void displayArray(int[] array) {
System.out.println(numbers + "Numbers Generated");
[Code] .....
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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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Feb 24, 2015
how to read and understand the API's. I've got an array list and I was wondering if there was a method that can randomly re arrange the elements in terms of their index positions.
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May 7, 2014
I am trying to create a method that takes an array of integers and prints it out using System.out.print. I'm having trouble creating the right way to print it out since I cannot find a way to convert the int array to a string to print it out.
public static String printArray(int[] num){
for (int i=0; i<num.length;i++){
String msg = num[i];
}
return System.out.print(msg + " ");
}
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Jan 27, 2015
Write the following method that shuffles an array list of numbers.
public static void shuffle(ArrayList<Number> list)
package shuffleArrayList;
import java.util.ArrayList;
import java.util.Arrays;
public class ShuffleArrayList
{
public static void main(String[] args)
[code]....
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Feb 12, 2014
How to convert numbers into string without using an array and a method ....
Example of arrayed code:
The code here is working but i want to use the other way for not using array just like switches and if and loops only.
I made a code here but i did'nt run what i want to output .....
package UnderPackage;
import java.util.Scanner;
public class NumberToWords {
static Scanner input = new Scanner(System.in);
public static void main(String[] args) {
int number;
int b;
[Code] ....
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Nov 19, 2014
I was trying to get sum of numbers between two given integer and managed to do it.
public int sum(int a, int b) {
int sum=0;
while(a <= b) {
sum+=a;
a++;
}
return sum;
}
in here; when I enter the values i.e 2 and 5, it calculates 2+3+4+5 and gives me the result 14.
my question is, how could I exclude a and b in this calculation ( in this case exclude 2 and 5 and return 3+4 )
Bonus question ; how could I only calculate the odd (or even) numbers between those integers?
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Sep 12, 2014
I have a code like following. x and y are both Integers and have same values (e.g. 5). But they are interpreted as different values. Then, it validates the following condition.
Java Code: if (x != y) {
"x and y are different..."
} mh_sh_highlight_all('java');
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Aug 14, 2014
I want users to input their phone Number But I want to make sure it is a phone number so they don't just do 1 and then leave it.
public static void main(String[] args) {
// Create the Scanner
Scanner in = new Scanner(System.in);
// Create the Variables
int phone;
if(phone > 100000000000 || phone < 100000000000) {
System.err.println("Error");
}
By the Way there are 12 digits in the if statement so that is 11 0's. Because all phone numbers are 12 digits.But when I run it, it comes up with an error saying The literal 100000000000000000000 of type int is out of range.I don't know how to make it so that the int has a limited number.
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Aug 14, 2014
I want users to input their phone Number But I want to make sure it is a phone number so they don't just do 1 and then leave it.
public static void main(String[] args) {
// Create the Scanner
Scanner in = new Scanner(System.in);
// Create the Variables
int phone;
if(phone > 100000000000 || phone < 100000000000) {
System.err.println("Error");
}
By the Way there are 12 digits in the if statement so that is 11 0's. Because all phone numbers are 12 digits.But when I run it, it comes up with an error saying The literal 100000000000000000000 of type int is out of range.I don't know how to make it so that the int has a limited number.
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Feb 13, 2014
i am working on the same project and i got the code to make them print going down but not sideways.
public class ArrayofHope
{
public static void main(String args[])
{
System.out.println("Decimal Character
");
for(int j = 65; j <= 90; j++)
{
System.out.print(j);
System.out.println(" " + (char)j); //Character
}
}
}
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Nov 15, 2014
We were given a class lab that asks us to write a program that create a multidimensional array ( 5 x 5 ), populates the array using nested loops with letter from A until Y, and displays the array to the screen. and the result should look like this:
A B C D E
F G H I J
K L M N O
P Q R S T
U V W X Y
How to write this program.. I have tried all my best but the results are not coming like this..
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Nov 9, 2014
I don't want to use an array. I do not know of a function built into Java to allow me to do this.
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Jan 21, 2015
This program simply adds integers to an ArrayList and then prompt the user if they would like to delete specific numbers that they don't want.
The output that I get when I want to delete numbers like 2 and 4 from 1 2 3 4 5 is 1 2 3 4 5 instead of 1 3 5.
Java Code:
import java.util.ArrayList;
import java.util.Scanner;
public class AL
{
// A regular array like int arr[] has to have its size declare before run-time and it's not dynamic which mean it can not grow or expand on its own.
static Scanner input = new Scanner(System.in);
// You have to use reference types(Integer, Double, Float); not primitive types(int).
[Code] .....
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Oct 29, 2014
I'm trying to make a piece of code that writes a for Loop program using OOP. I need to create a class, name that class and have it contain several reverse methods and use a runner class to test it.So far this is the code I've come up with. Does it work or not?
public class loopDemo{
public static void main(string[]args){
String alphabet = "abcdefghijklmnopqrstuvwxyz";
public String reverse(){
char myBoi;
int myIta;
String tebahpla
for(myIta=25j i>=0 ji++){
tebahpla+= alphabet.charAt(myIta);
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Feb 13, 2014
I have double checked this code over and over and I just can't find the problem.
What I'm trying to do is take a file and input it into an 2D array.
Ultimately, I should convert the array of integers to an array of characters, then print it out. The file contains a set of ASCII values.
After printing it out, I should then create methods to manipulate the image produced.
Using 2D arrays is a requirement for this exercise.
I think that somehow I'm overcomplicating this and the solution is a lot more simple than I think, but I can't think of what to change.
The error I am getting is:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 40
at main.main(main.java:17)
Java Code:
import java.util.*;
import java.io.*;
public class main {
public static void main(String[] args)
throws FileNotFoundException {
String[][] data = new String[22][40];
[Code] .....
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Mar 12, 2015
Develop a method that accepts as data input three integer numbers, calculates the sum and the product of the numbers, and displays the sum and product.
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Apr 24, 2014
I've just written a program that generates 100 numbers that range from 0 ~ 25 using arrays, the program calls another method that sorts the even numbers into a separate array and returns the array. I need it to display both arrays, however, when I run my program, the numbers of both arrays are mixed together, and I'm not sure how to separate them.
[ public class Array1
{
public static void main(String[] args)
{
int array [ ] = new int[100];
for (int i = 0; i < array.length; i++)
{
array[i] = (int) (Math.random() * 26);
[Code] .....
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Jun 26, 2014
I am wondering how one rearranges an existing complex UI using scene builder. I have tried, for example, to add a scrollpane around another pane that was already nested deep in my layout and did not find a way to do this. Is this not supported or am I just not getting how it's done? Typical practical examples of this would be that one introduces a split pane around an existing part of the layout and moves existing controls/panes including all their configuration (resource keys, bindings etc.) into one part of the split pane to add more functionality into another.
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Feb 4, 2015
Java Code:
// Demonstrate a two-dimensional array
class TwoDArray {
public static void main(String args[]) {
int twoD[] [] = new int[4] [5];
int i, j, k = 0;
[Code] .....
Output:
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
(1) I don't understand how repeating the loop creates the structure of the output. Taking the second loop away and putting the "System.out.print(twoD[i] [j] + " " );" under k++ creates the output to print a number on each line. How do I write the code not having the second loop, assigning k to each value that is moved through the grid then printing it out but having the output the same?
Java Code:
for(i=0; i<4; i++)
for(j=0; j<5; j++) {
twoD[i][j] = k;
k++;
System.out.print(twoD[i] [j] + " " );
System.out.println();
} mh_sh_highlight_all('java');
(2) I don't understand why you can't put a new line sandwiched between the first for loop
Java Code:
for(i=0; i<4; i++)
System.out.println();
for(j=0; j<5; j++) {
twoD[i][j] = k;
k++; mh_sh_highlight_all('java');
It compiles, but I get the message:
" Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at TwoDArray.main(TwoDArray.java:11) "
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Jan 20, 2015
import java.util.Arrays;
import javax.swing.JOptionPane;
public class Student {
public static void main(String args[]) {
String [] A =new String [4]; //krijon tabelen e emrave
[Code] ....
It Prints [firstname,secondname,thirdname,fourthname]
and [0,0,7,9]
The problem is that the first 2 integers of the second array are always 0 even if i put another grade like for example 6 or 7...
Our teacher asked to input the names and grades of the students using JOptionPane and then find the MINIMUM grade and how many times this grade is repeated...
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