Used Selection Sort Method On Array

Nov 11, 2014

I have a question about selection sort. If I had an array of numbers, 1 2 3 4 100 0, and used the selection sort method (below) on the array,would the 0 slowly work it's way down to the end?

Nest loop = full rotation of nest loop

Nest loop 1: 1 2 3 4 100 0
Nest loop 2: 1 2 3 4 100 0
Nest loop 3: 1 2 3 4 100 0
Nest loop 4: 1 2 3 4 100 0
Nest loop 5: 1 2 3 4 0 100
Nest loop 6: 1 2 3 0 4 100
etc.

METHOD:

static void selectionSort(int[] arr){
int n = arr.length;
for(int i = 0;i<n;i++){
int min = i;
for(int j = i+1;j<n;j++){
if(arr[j]<arr[min]){
min = j;
}
}
int temp = arr[i];
arr[i] = arr[min];
arr[min] = temp;
}
}

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Selection Sort Method - Sorting Array And Return Result Of Each Step

Nov 20, 2014

This time I am having difficulties with selection sort method, but not with the method itself (I think). So I need to sort an array and return the result of each step.

This is the main code:

public class Functionality {
public static int[][] selctionsort(int[] a) {
for (int i=0; i<a.length; i++) {
int least = i;
for (int j=i+1; j<a.length; j++)

[Code] ....

And this is the Test folder:

import static org.junit.Assert.assertArrayEquals;
 public class PublicTests {
public static void main(String[] args) {
int[] a = new int[] { 35, 7, 63, 42, 24, 21 };
int[][] b = new int[][] { new int[] { 7, 35, 63, 42, 24, 21 },

[Code] ....

Now I am not sure what should I write in return since the 2nd (test) project has int[][] and in my main project I am working with int [].

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Mar 5, 2014

I'm trying to make a selection sort method that will sort a list of Strings alphabetically.

I have a test list of Strings like so:

Joe, Steve, Oscar, Drew, Evan, Brian, Ryan, Adam, Zachary, Jane, Doe, Susan, Fred, Billy-Bob, Cindy, Mildred, Joseph, Hammer, Hank, Dennis, Barbara

However, whenever I run the method, the element that should go last, Zachary, in this case, ends up getting moved to the front for some reason. I'm not sure why.

I tried changing what the first element was initialized to, to the variable i as that would logically work as well, but it ends up missing the first element in the list.

Java Code:

public static void selectionStringAscendingSort (String[] words){
int i, j, first;
String temp;
for ( i = 1; i < words.length; i++ ) {
first = 0; //initialize to subscript of first element
for(j = i; j < words.length; j ++){ //locate smallest element between positions 1 and i.
if( words[ j ].compareTo(words[ first ]) <0 )
first = j;
}
temp = words[ first ]; //swap smallest found with element in position i.
words[ first ] = words[ i ];
words[ i ] = temp;
System.out.println(Arrays.toString(words));
}
System.out.println(Arrays.toString(words));
} mh_sh_highlight_all('java');

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Making Selection Sort Into A Recursive Method

Oct 21, 2014

How would I modify this version of a selection sort into a recursive method?

public static void selectionSortRecursive(Comparable [] list, int n)
{
int min;
Comparable temp;
for(int index =0; index < n-1; index++){
min = index;

[code]....

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May 21, 2014

This is a lab for one of my CS classes, and the assignment is to create a randomly filled array (values 10-100) and use these values as the height of an array of rectangles (essentially a bar graph)that will be drawn on a page. After that's done, the code should use the selection sort method to sort the bars least to greatest, being repainted as it's sorted.

I'm receiving no errors, the original draws just fine, and the code sorts the first position and then...it just hangs. Like it's in an infinite loop but I have all of the modifiers in place (I think. I've been staring at this code for three days straight and I don't think I really see it anymore). I've tried talking to my professor and I get that her private life is really busy right now, but she just keeps blowing me off and I don't know what to do. Anyway, done with back story and whining so here's the code.

Rectangle class:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Rectangle

[code]....

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Copying Random Generated Numbers To Selection Sort Method

Mar 19, 2015

Java Code:

import java.util.ArrayList;
import java.util.Random;
public class NumSorting {
public static int numOfComps = 0,
numOfSwaps = 0;
public static void main(String[] args)

[Code] ....

What is wrong with my code in this sorting program? It won't copy the random generated numbers to the sort method. How to get the random generated numbers to copy to the sort method. Below is what the program is displaying.

Original order : 3 2 5 4 1

Selection Sort

Original order:

[I@7a84e4

Number of comps = 10

Number of swaps = 0

Sorted order : 0 0 0 0 0

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Nov 19, 2014

I know it is possible to do this using the Array class but I don't want to use that. I am trying to use selection or bubble sort but I believe selection is what I want. This program asks the user to input 2 arrays with 10 integers each, sorts them from smallest to largest, then states whether they are the same or not. Comparing the two arrays.

import java.util.Scanner;
public class SetDifference
{
public static void main (String args[])
{
Scanner sc = new Scanner (System.in);
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int array2[] = new int[10];

[Code] .....

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Oct 21, 2014

How would I modify this version of a selection sort into a recursive method?

public static void selectionSortRecursive(Comparable [] list, int n)
{
int min;
Comparable temp;

[code]....

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May 20, 2014

I am trying to write a program that graphically displays a selection sort. It needs to sort bars of various heights, and the bars heights are generated from an array of random integers. The program needs to show the bars swapping as they are being sorted, I am having trouble getting the bars to draw, it needs to look like a bar graph. Here is my code thus far (not counting my boiler plate):

import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.Timer;
import java.awt.*;
import java.util.Random;
public class SelectionSortPanel extends JPanel

[Code] ....

Also right now it is giving an error from the compareTo method?

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Nov 8, 2014

I have an arrayList with these values:

Mike Smith with a customer id of 100 has an account number of 1000 and a balance of $5,000.00
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Sam Overstreet with a customer id of 102 has an account number of 1002 and a balance of $45,000.00
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and so on .....

I am trying to do a selection sort by the account holders last name. I understand how to do if the Arraylist holds integers, but my arraylist holds multiple fields. I am not allowed to use collections as this is a homework assignment.

here is the Account Class

public class Account implements Comparable<Account> {
private int acctNum;
private double balance;
private Customer cust; // note we are putting a Customer object in the Account clas
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[Code] ....

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Nov 26, 2014

Here is the code I have at the moment:

/**
* Use selection sort to sort the tracks by name. Return a new, sorted ArrayList of tracks.
*
* @return an ArrayList containing the tracks sorted by name, or null if no tracks exist
*/
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// YOUR CODE HERE
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[Code] ....

Here are my 2 issues (there are 2 lines with compiler errors): I feel like I understand selection sort and binary search, but am not sure how to apply it to the more abstract idea of a Track ArrayList (hence the 2 compiler errors). What should I use to make it work. Lastly, I'm very uncomfortable with recursion, so my guess is there is also probably some logical issue with it in the getTracksSortedByName method.

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[Code] ....

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