Insertion Sort Using ArrayList
Sep 27, 2014
Im trying to do an insertion sort using ArrayLists and I keep getting this error after the sorting section where it doesnt sort anything at all, but still displays my previous array list.:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 7, Size: 7
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at Utilities.insertionSort(Utilities.java:102)
at Utilities.main(Utilities.java:66)
My code:
import java.util.*;
import java.lang.*;
public class Utilities {
public static void main(String[] args) {
ArrayList<String> equipment = new ArrayList<String>();
[Code] ......
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Jul 20, 2014
I could have copied the code for a standard algorithm such as insertion sort, but I wanted to do it on my own to see how well I think. I came up with a working solution below. This is efficient or not or if I can make improvements. Would this approach ring any alarm bells in an interview ?
public static void insertionSort(int[] unsortedArray) {
int[] a = unsortedArray;// alias for the array
int s = 0;// index before which all elements are in order.
int tmp = 0;// temporary variable
int last = a.length - 1;
[code]....
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Jan 1, 2014
I can't spot where my java implementation of insertion sort differs from the pseudocode here:Well, there is one difference in the parameters used by the insert method, which is inconsistent in the pseudocode.I'm pretty sure it should be calling insert (a,n) instead of (a,i,n);
insert(a,k) i←k
x ← a[k]
while x < a[i − 1]
x ← a[i]
a[i ] ← a[i − 1] i ←i −1
a[i]←x return
insertion-sort(a,n)
m ← select-min(a,1,n) swap(a,1,m)
fori from2upton
insert(a,i,n) return
Here is my attempt at a java implementation, which doesn't actually seem to do anything.I've kept variable names as in the pseudocode. Might technically be bad practice, butI think it should make it easier to follow in this particular scenario.public class InsertionSort {
public static void main(String[] args) {
int[] array = { 99, 2, 44, 14, 14, 44, 11, 33, 14, 14, 51 };
insertionSort(array, 10);
for (int i : array)
System.out.print(i + " ");
[code]...
Why am I so interested in this pseudocode when there are simpler java-ready examples of insertion sort on the internet? Simply because this is the code the professor uses, so I should be able to understand it.
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Feb 4, 2014
public class Employee {
private String firstName;
private String eeid;
}
I want to sort using empoyee firstName.. If two employee names are same, i need to sort based on eeid.. using insertion sort
if (key == "name") {
for (int i = 1; i < list.length; i++) {
Employee t = list[i];
int j;
for (j = i - 1; j >= 0 && t.getLastName().compareTo(list[j].getLastName())<0; j--)
list[j + 1] = list[j];
list[j + 1] = t;
}
}
It will sort using names.. But if two names are same, it wont sort based on eeid.. I want to achieve only using insertion sort..
EX:
vivek 8
broody 2
chari 3
vivek 5
chari 1
output:
broody 2
chari 1
chari 3
vivek 5
vivek 8
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Apr 14, 2015
I am working on my generic insertion sort program. When I completed and run my code, I am having trouble with my code. So, I am just trying to see if I get an correct array from a file. However, i just get so many nulls in the array. Therefore, I can't run my insertionSort function because of null values.
Here is my code
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
[Code].....
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Jun 9, 2014
im trying to create an insertion sort method for a vector. I know how to insertionsort for an array, but for a vector im having problems
Source code:
PHP Code: package test;
import java.util.*;
import java.io.*;
public class LinearSearch {
public static void main (String[] args) {
Vector myVector = new Vector();
[Code]...
I'm getting errors at lines 38 and 39 "Left-hand side of an assignment must be a variable". "Syntax-error(s) on token(s) misplaces contructor(s)". How can i fix them ??
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Aug 29, 2014
In class we were give the algorithm for a non-decreasing algorithm here:
This is pseudo code given for the non-decreasing.
for j = 2 to A.length
key = A[j]
i = j - 1
while i > 0 and A[i] > key
A[i+1] = A[i]
i = i -1
A[i = 1] = key
//I was asked to make it non-increasing, so this is what I have.
for j = A.length - 1 to 1
key = A[j]
i = j - 1
while i > 0 and A[i] < key
A[i+1] = A[i]
i = i + 1
A[i-1] = key
Is there anything wrong with this algorithm? Will it give me the non-increasing sort?
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Jan 25, 2015
I have to write the Insertion Sort Algorithm using Java codes and at the same time find the time of execution for different sizes of array, filled with random numbers. If I try to show the numbers inserted into the array randomly, they don't appear at the console.
import javax.swing.JOptionPane;
public class Insertion {
public static void main(String[]args){
int SizeArr = new Integer(JOptionPane.showInputDialog("Enter the size of teh array")).intValue();
int [] r= new int [SizeArr];
{for(int d=0; d<r.length; d++)
[Code]...
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Jun 30, 2014
How can i sort my ArrayList, which contains cars, with year and used year, i want to sort them first from year, and then from used year . what should i use?
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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
Hank Jones with a customer id of 101 has an account number of 1001 and a balance of $45,000.00
Sam Overstreet with a customer id of 102 has an account number of 1002 and a balance of $45,000.00
Hank Jones with a customer id of 101 has an account number of 1003 and a balance of $48,000.00
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
private static int nextAcct = 1000;// used to keep track of the next available account number
[Code] ....
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Mar 9, 2014
I have a project where I must sort a collection of songs by a number of fields: year, rank, title and artist. in the project, we must use certain methods and we cannot add others without getting marked down. Here are the specific requirements:
Sorting
The -sortBy option will cause the output to be sorted by a particular field. If this option is specified, the output should be ordered according to the field named. If there are ties, the tied songs should appear in same order in which they were in the input file. If no -sortBy option is specified, the output should maintain the order of the input file.
public void sortYear()
Order the songs in this collection by year (ascending).public void sortRank()
Order the songs in this collection by rank (ascending).public void sortArtist()
Order the songs in this collection lexicographically by artist (ascending, case-insensitive).public void sortTitle()
Order the songs in this collection lexicographically by title (ascending, case-insensitive).
Here is the relevant code:
SongCollection Class
Java Code: import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.*;
[code]....
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Sep 14, 2014
So I'm trying to implement a quick sort method for an ArrayList of Strings and right now I'm getting the compiler error message: Exception in thread "main" java.lang.OutOfMemoryError: Java heap space. I don't know what that error means nor how to fix it. I've marked in my code where the error seems to be occurring.
import java.util.ArrayList;
public class quickSort
{
// constructor
public quickSort()
[code]....
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Apr 6, 2014
I'm trying to implement a non-recursive version of the insertion method, but I'm having a bit of trouble. From what I can tell, it's only returning the last two node..
public void insert(Key key, Value val) {
root = insert(key, val, root);
} private Node insert(Key key, Value val, Node x) {
if(x == null) {
x = new Node(key, val, 1);
[code].....
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Jul 8, 2014
I have to insert certain lines of html code in already existing file of html using java.I have to add certain things in head and some things in body.
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Apr 20, 2015
I am having some difficulty adding a new item to the HashTable when a collision occurs. We can only use the basic utilities to code this, so we are coding a HashTable by hand. We have an array of length of 10, which each index holds or will hold a Node for a Linked List.
The code hashes fine, adds the item, but the problem exists when adding items that already been hashed. The project is much bigger, but this is the engine behind the rest, and I figured I would tackle this first.
The items we are adding are objects which are states containing different information, we hash based on the ASCII sum % tableSize.
Here is the code I am testing with to add items:
HashTable ht = new HashTable(10);
State az = new State("Arizona","AZ","W",2,"Y",2);
State fl = new State("Florida", "FL", "F", 2, "X", 2);
State hi = new State("Hawaii", "HI", "H", 3, "Z", 1);
State al = new State("Alabama", "AL", "A", 5, "W", 0);
ht.insert(hi);
[Code] ....
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Apr 2, 2014
I'm trying to insert data into an excel sheet with the below Servlet.
/*
* 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.
*/
import java.beans.Statement;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
[Code] ....
But it is giving me the below Exception and stacktrace
java.text.ParseException: Unparseable date: "2-Apr"
at java.text.DateFormat.parse(DateFormat.java:357)
at Serv1.doPost(Serv1.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
[Code] ....
i found that the problem is within the date field(, if the problem is with the date, how i can fix it and where am i going wrong.
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Feb 24, 2014
Operator is undefined for argument type. Error is located at the end of the binary search method array[position] < key
import java.util.Arrays;
public class binarySearch {
public static <T extends Comparable<T>> int binarysearch(T key, T[] array) {
int start = 0;
int end = array.length - 1;
int position =-1;
while (start <= end && position == -1) {
[Code]....
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Feb 8, 2014
We have an autosys job running in our production on daily basis. It calls a shell script which in turn calls a java servlet. This servlet reads these files and inserts the data into two different tables and then does some processing. Java version is 1.6 & application server is WAS7 and database is oracel-11g.
We get several issues with this process like it takes time, goes out of memory etc etc. Below are the details of the way we have coded this process.
1. When we read the file using BufferedReader, do we really get a lot of strings created in the memory as returned by readLine() method of BufferedReader? These files contain 4-5Lacs of line. All the records are separated by newline character. Is there a better way to read files in java to achieve efficiency? I couldnt find any provided the fact that all the record lines in the file are of variable length.
2. When we insert the data then we are doing a batch process with statement/prepared statement. We are making one batch containing all the records of the file. Does it really matter to break the batch size to have better performance?
3. If the tables has no indexes defined nor any other constraints and all the columns are VARCHAR type, then which operation will be faster:- inserting a new row or updating an existing row based upon some matching condition?
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Feb 28, 2014
I'm trying to create my own arraylist using Collection. My program doesn't do anything. Obviously, I haven't a clue.
import java.util.Collection;
import java.util.Iterator;
public class MyArrayList<T> implements java.util.Collection<T> {
private int size = 4;
private T[] mArray;
public MyArrayList(String[] args) {
[Code] ....
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Jul 8, 2014
I have stumbled onto a problem with ArrayLists (not sure if nested ArrayList objects would be a more accurate description) ....
As simply put as I can describe it, I have an Inventory class which creates an ArrayList of a Product superclass, which has two subclasses, PerishableProduct and ItemisedProduct.
By default, the program is meant to have a starting inventory, which is why I have added them in the constructor
public class Inventory {
private List<Product> products;
public Inventory() {
addProduct(new Product("Frying pan", 15, 20));
addProduct(new PerishableProduct("Apple", 5.8, 30, 7));
addProduct(new ItemisedProduct("Cereal", 5.8, 0));
// this is where I am having problems. Wanting to add
// objects to the ItemisedProduct's ArrayList for cereal.
}
Within the ItemisedProduct subclass is yet another ArrayList which is meant to hold serial numbers.
public class ItemisedProduct extends Product {
private ArrayList<String> serialNumbers = new ArrayList();
public ItemisedProduct(String name, double price, int qty) {
super(name, price, qty)
[Code] .....
My problem is that I do not know how to populate the serialNumbers ArrayList from the Inventory class' constructor. Because technically, quantity is defined by how many serial numbers are created.
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Jan 9, 2014
how can i sort a Jtable, If i have in a certain column Strings and Integers, but I don't want to sort like string.example:
ID |
----------
1
11
2
213
22
MOSTR
MOSTIR
i dont want this to happen when i sort this column, I'm using table.setAutoCreateRowSorter(true);
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Mar 26, 2014
Add accounts on a list, each account contain: name, accountCode, pinCode, balance.
How to show list sort by balance?
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Aug 2, 2014
public class Person implements Comparable<Person> {
// the age of the person
private int age;
//the name of the person
private String name;
//the Integer object to wrap the age value;
private Integer ageWrap;
[Code] .....
The collection library has a class named TreeSet, which is an example of a sorted set. Elements in this set are kept in order. Carefully read the description of this class, and then write a class Person that can be inserted into a TreeSet, which will then sort the Person objects by age.
This is the exercise I am trying to solve. And this is as far as I have gotten to. Is it possible to sort my setOfPersons TreeSet directly? I tried to use
Collections.sort(setOfPersons)
method but it wont compile, and I realized that it is not applicable to TreeSet. So I made the
sortByAge()
method to do it indirectly...
I am puzzled though because in the exercise it states
write a class Person that can be inserted into a TreeSet, which will then sort the Person objects by age.
meaning that the TreeSet will sort the Person Objects and not my class..
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Aug 7, 2014
I am getting incombatable types, I do not know why I am getting them..why I am getting the error?
The Error I am getting:
stringSort.java:26: error: incompatible types
if(myArray[j].compareToIgnoreCase(myArray[i].toString())){
^
required: boolean
found: int
*/
[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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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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