Java QuickSort Stack Overflow Error
Jan 19, 2014
I have an error using quicksort and this is a project ... The error occurs for numbers such as 7500 and bigger ...
Exception in thread "main" java.lang.StackOverflowError
at QuickSort.QuickSort(QuickSort.java:45)
at QuickSort.QuickSort(QuickSort.java:46)
at QuickSort.QuickSort(QuickSort.java:46) ...
Java Code:
import javax.swing.JOptionPane;
public class QuickSort{
public static void main(String[] args){
int p=new Integer(JOptionPane.showInputDialog("Jepni numrin e kufizave: "));
int[] ListaNumrave= new int[p];
//QuickSort Zbrites
[Code] .....
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Oct 22, 2014
I am getting a stack overflow error for my method that recursively gets the height of an AVL tree. The odd thing is that it returns the height of the tree the first time I call that method, but when I call it again later on, I get that error, which I does not make any sense to me. I have a base case, where it is supposed to stop when the node is null, but it never reaches that. Also, when I print out the values, it alternates b/w three values: 5, 4, and 24. Something else, which I think is important to state, is that if I put the print statement before my base case, the IF, I get a warning stating that my entire IF statement is dead code...but why?
is that everytime I insert/delete a value into the AVL tree I must make sure that it is height balanced (none of the siblings may have a difference in height from each other > 1); if its not height then I rotate certain nodes accordingly. The first 10 items that I input are: 100, 50, 24, 200, 190, 10, 5, 190, 100 and 4. The pre and in order prints of these, from the console are:
PRE ORDER: 100 10 5 4 24 50 200 190 100 190
IN ORDER: 4 5 10 24 50 100 100 190 190 200 .
private int rheight(AVLNode<E> node) {
//if i put the print statement here, my IF becomes "dead code"
if(node == null){
return 0;
}
else{
[code]....
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Jun 14, 2014
I am getting a stack overflow error. I know there's something off about the code but I can't get it....
// The "SplashScreen" class.
import java.awt.*;
import javax.swing.*;
public class SplashScreen extends JWindow
{
ImageIcon book;
public SplashScreen ()
[Code] ......
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Oct 15, 2014
I have wriiten a quick sort algorithm. I have used the last element as my pivot. The program is running for all sizes except for 100000 and 1000000 elements when they are sorted and unsorted list .
It shows me the error : Exception in thread "main" java.lang.StackOverflowError
I guess the memory gets out of space and we need to increase the stack size in eclipse. How do I increase the stack size in eclipse.? I tried increasing through run--run configurations-- program arguments and typed---- -Xmx4096m but this didn't work in any way.
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Jun 22, 2014
In the following program i have called the anonymous class of dev class.
interface emp {
void desig();
}
public class dev implements emp {
dev e = new dev() //this line is throwing error ...works fine if i use emp instead of dev {
[Code] .....
i am getting stack over flow error as :
Exception in thread "main" java.lang.StackOverflowError
at dev$1.<init>(dev.java:17)
at dev.<init>(dev.java:16)
at dev$1.<init>(dev.java:17)
[Code] .....
Is it because the jvm is not able to decide which of the 2 desigs() it has to load in the memory when its object is created in the main..??
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Jun 4, 2014
I can't figure out this problem that I'm having in my Pong game. It's compiling fine, except when I run it, it gives me an overflow error.
Here's the code:
// Pong
import javax.swing.JFrame;
import java.awt.Color;
import java.awt.Graphics;
public class Pong extends JFrame {
private static final int WIDTH = 400;
private static final int HEIGHT = 400;
[Code] .....
Here's the error:
java.lang.StackOverflowError
at sun.awt.AppContext.get(AppContext.java:604)
at com.sun.java.swing.SwingUtilities3.getDelegateRepa intManager(SwingUtilities3.java:120)
at javax.swing.RepaintManager.getDelegate(RepaintMana ger.java:1625)
at javax.swing.RepaintManager.addDirtyRegion(RepaintM anager.java:445)
The error keeps going for a lot of more lines.
The line that gets highlighted is the first bracket of the Pong constructor.
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Jun 3, 2014
I was cannot do the action with + - * /.so i cannot have an output.where is the problem ?
Java Code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.util.Stack;
[code]....
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May 6, 2015
I have been given this Pseudocode for the Quicksort algorithm:
quicksort(a[], p, r)
if r>p then
j=partition(a[], p, r)
quicksort(a[], p, j-1)
quicksort(a[], j+1, r)
[code]....
I was wondering why:
- why the condition left < right needs to be true for the while loop in the function Partition
- what the while loop does in the function Partition
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May 19, 2014
I am currently writing the Quick Sort implementation where the pivot is chosen to be the medianOf3 element in the sub array. The program should output the total number of comparisons (excluding the ones needed to compute the median itself).I cannot spot any mistake anywhere - yet I am getting the wrong output in the end.
Input file (100.txt) attached.
Current output: 513. Correct output: 518. Where are the missing 5 comparisons? />
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
[code]....
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Oct 1, 2014
I am trying to do a program that takes all of the chars from a string and orders them in alphabetical order. It works fine, but when a is a last letter of a string it isn't being sorted.
Example: bcba = bbca, omnibus = bimnous (here u is in wrong place)
Here is my code:
public class sorty{
public static void sort(char[] a, int low, int high){
int i = low;
int j = high;
if (j - i < 2) return;
int m = (j+i)/2;
char p = a[m];
[Code] .....
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Feb 24, 2014
My objective is to execute quick sort ( i was told to convert the pseudocode from the Cormen book) using arrays of increasing sizes and find the average number of comparisons for each of those sizes over 100 iterations. This is a school project and the numbers I am getting are far larger than those of my friends, so I am clearly doing something wrong. I believe it must be in the way that I am collecting and averaging my number of comparisons. I will first give the method in which most of that calculating is done, then I will include the whole program.
public static void tests(int arraySize) {
long numComparisons = 0;
long averageComparisons = 0;
long[] numComparisonsArray = new long[100];
for(int i = 0; i<100; i++) {
int[] array= genRandomArray(arraySize);
[code]....
I was simply not zeroing out one of my variables
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Jun 3, 2014
I have to implement all the stack methods in java such as push, pop empty, not using the ready methods but have to create them and to execute an exercise but is sth wrong with it
public class Stiva {
/** the problem is here how to declare the stack 1 and stack 2 and kreu(head) gjmax(size)*/
int Gjmax;
int array[] = new int[Gjmax];
int kreu;
private Stiva stiva1;
private Stiva stiva2;
[Code] .....
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Jun 3, 2014
I have to implement all the stack methods in java such as push, pop empty, not using the ready methods but have to create them and to execute an exercise but something wrong with it....
public class Stiva {
/** the problem is here how to declare the stack 1 and stack 2 and kreu(head) gjmax(size)*/
int Gjmax;
int array[] = new int[Gjmax];
int kreu;
private Stiva stiva1;
private Stiva stiva2;
[Code] .....
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Jun 2, 2015
Compute the height of a stack. Then determine whether that value is found in the stack element .
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Nov 12, 2014
I have a custom linkedList(single) class that uses the provided node class. Now I have another class to QuickSort this.(left out for brevity, i just wanna focus on editing the L.head). However, instead of passing the quicksort method the entire linkedList, I want to pass it just the head from the linkedlist.
My problem is accessing this head node and changing it from the quckSort method/class, and I dont want to delete it or simply just change the element value
Main:
public class TestLinkedList {
public static <E extends Comparable<E>> void main(String[] args) {
MyLinkedList<Integer> L = new MyLinkedList<Integer>();
L.add(3);
L.add(1);
L.add(2);
System.out.println("Initial=" + L);
MySort.quickSort(L.head);
System.out.println("After ="+L);
}
}
QuickSort:
public class MySort {
public static <E extends Comparable<E>> void quickSort(MyNode<E> list) {
list = list.next;
}
Node Class:
public class MyNode<E extends Comparable<E>> {
E element;
MyNode<E> next;
public MyNode(E item) {
element = item;
next = null;
[code]....
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May 21, 2014
My assignment is to design a simple GUI calculator using the stack data structure to perform additions, subtractions, multiplications and divisions. But i having error while i press the action there.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.util.Stack;
public class JCalculator implements ActionListener {
[Code] ...
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Aug 13, 2014
I am trying to figure out stacks and queues and was trying to get this Palindrome program working so I could then play with it and use the Java visualizer site but for some reason the program isn't working correctly. It always states that the input is a palindrome no matter what the user input is.
The book that I got the code from is a little old so I changed a couple small things that I thought needed updating like adding scanner. I wanna use one with a custom array based stack and queue class rather than the java.util.Stack and Queue interface, just for understanding stacks and queues better hopefully.
import java.util.Scanner;
import javax.imageio.IIOException;
public class PalTest {
public static void main(String[]args) throws IIOException
{
Scanner scan = new Scanner(System.in);
PalindromeTesting x = new PalindromeTesting();
[Code] .....
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Jan 5, 2015
is this program correct? for Implementing two Stack in one array. how can i solve it ?
public class Stackation11 {
int max = 10;
int [] array = new int[max];
int top;
int top1;
Stackation11(){
[code]....
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Apr 24, 2014
after i am done calculating everything from numbers stack, i pop the last number and return it... my question is how can i catch an exception if the size of my numbers stack is greater than 1;
public static String evaluate(String input) {
char[] a = input.toCharArray();
if (input.isEmpty())
return "No input";
else if (input.equals(" "))
return "No input";
else if (input.equals(" "))
[code]....
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Apr 11, 2014
Write a method compressDuplicates that accepts a stack of integers as a parameter and that replaces each sequence of duplicates with a pair of values: a count of the number of duplicates, followed by the actual duplicated number. For example, suppose a variable called s stores the following sequence of values:
bottom [2, 2, 2, 2, 2, -5, -5, 3, 3, 3, 3, 4, 4, 1, 0, 17, 17] top
If we make the call of compressDuplicates(s);, after the call s should store the following values:
bottom [5, 2, 2, -5, 4, 3, 2, 4, 1, 1, 1, 0, 2, 17] top
This new stack indicates that the original had 5 occurrences of 2 at the bottom of the stack followed by 2 occurrences of -5 followed by 4 occurrences of 3, and so on. This process works best when there are many duplicates in a row. For example, if the stack instead had stored:
bottom [10, 20, 10, 20, 20, 10] top
Then the resulting stack after the call ends up being longer than the original:
bottom [1, 10, 1, 20, 1, 10, 2, 20, 1, 10] top
If the stack is empty, your method should not change it. You may use one queue as auxiliary storage to solve this problem. You may not use any other auxiliary data structures to solve this problem, although you can have as many simple variables as you like. You may not use recursion to solve this problem. For full credit your code must run in O(n) time where n is the number of elements of the original stack.
I wrote a code but still having a problem with it , am I allowed to use 3 while loops ?
public void compressDuplicates(Stack<Integer> s ){
Stack<Integer> backup= new Stack<Integer>();
int count = 1;
while(!s.isEmpty()){
int temp = s.pop();
[Code] .....
// example 1
Expected output : bottom [5, 2, 2, -5, 4, 3, 2, 4, 1, 1, 1, 0, 2, 17] top
My output: //bottom [17, 2, 2, 2, 2, 2, -5, -5, 3, 3, 3, 3, 4, 4, 1, 0, 17, 17] top
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May 2, 2015
For my classes I wrote I have puts strings into a stack and also a queue and am wondering how to take the top of the stack and the front of the queue and turn those into strings in my main class and run them through while loops that will detect if they are palindromes or not. Right now I am trying to peek and use first to put in my while loop but they don't work with the .charAt because they are not considered strings I think.
import java.util.Stack;
public class Palindrome {
public static void main(String[] args) {
// TODO Auto-generated method stub
String enteredLine;
int leftStack, rightStack;
int leftQueue, rightQueue;
[Code] .....
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Jun 16, 2014
In my application a series of inputs and a calculated result. At the end of each loop these inputs and calculations are displayed. After the loop is over with the user does not enter a string that is "y" or "Y", I want these inputs and the calculation to be displayed in a First in First Out format or a stack. I am using a LinkedList that is used in a class creating a stack.
Here is the code for my stack.
Java Code:
import java.util.LinkedList;
public class GenericStack<E> {
LinkedList<E> stack = new LinkedList<>();
public void Push(E element) {
stack.addFirst(element);
[Code] ....
Here is the code containing the main method. The methods other than the main method are probably not relevant to the problem, but take a look if you like.
Java Code:
import java.util.*;
import java.text.*;
public class FutureValueApp
{
public static void main(String[] args) {
GenericStack<String> stack = new GenericStack<>();
[Code] ....
The stack seems to be adding the same inputs and the same calculation from the first loop, even when it is on it's 2nd or third loop. I am getting this output.
Java Code:
Monthly Inv.Int. RateYearsFuture Value
$5.002.0%5$315.76
$5.002.0%5$315.76 mh_sh_highlight_all('java');
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Jan 3, 2015
I tried to write a program to implement a stack but it has a bug I am unable to solve.The bug is that whenever I choose an operation to perform, eg push, After performing the operation, the loop is executed once again and Invalid choice message appears, i.e. the default case. And then the loop again executes to choose further option. Here is my code
class Stack {
private char[] stck;
private int len;
private int top;
[code]....
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Dec 3, 2014
I am working on implementing a stack using a linked list. Programming the stack operations (push, pop, isEmpty, etc.) was easy but my directions were to provide the user with a menu to choose the operation that he/she wishes to perform. I am new to JFrames/Menus so how to make the stack operations available in a menu.
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Apr 30, 2015
I'm trying to create a class that takes an String from a Stack and checking if it's a palindrome than taking a another String from a queue and checking if that is also a palindrome.
import java.util.Stack;
public class Palindrome {
public static void main(String[] args) {
// TODO Auto-generated method stub
String enteredLine;
int leftStack, rightStack;
int leftQueue, rightQueue;
PalinedromeArray stack1 = new PalinedromeArray();
[code]....
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Feb 21, 2014
Right now I have three stacks. Each stack holds characters, with the normal operations of pushing and popping. I am trying to compare two characters from stack1 and stack2(each character is a digit character). I would like to be able to do arithmetic on the digit characters and the push the answer on to a result stack.
Ex.) I pop character '3' from stack1 and '5' from stack2. Then I add the two. equaling '8' and pushing that character on to the result stack. This will hopefully in turn allow me to add arbitrary large numbers that integers will not support.
I am having trouble because I believe I am getting some ascii character values when I pop off the result stack. here is a small piece of my code
public void addition() {
char temp1 ,temp2;
int i = s1.getSize();
for(int j= 0;j<i;j++) {
temp1 = s1.pop();
temp2 = s2.pop();
if(temp1+temp2>=10)
[Code] .....
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