I am using Java 1.6, I have this class ....
import java.util.ArrayList;
import java.util.List;
public class TestDrive
{
public TestDrive()
{
super();
[Code] ....
What is the most efficient way to group the preferences of the same type, In other word I want just a print statement to print this line.
BREAKFAST(Eggs,Milk),SPORTS(Basket,Tennis),....
I am getting this error "Type mismatch: cannot convert from Object to E" in the last line of the pop() method.
package stack;
public class Node<E> {
E item;
Node next;
Node(E item) {
this.item = item;
this.next = null;
}
[code]....
I don't understand why that error occurs despite item being declared as type E in the Node class.
I want to create a program which contains a list with 5 items and a button on the first display. The desired option is chosen from from the list and the button is pressed. On pressing the button it must open a new form which corresponds to the chosen item from the list.
View Replies View RelatedHow do I make the file reader object move to the next line if there is no more input on the line. Here is my text and output file as you can see that my text file column cuts off on the 2nd line after 70. I want to read that next line which is 100 into my labs variable however its reading it into my final exams variable. I'll also post the code but I didn't think it was necessary.
textfile:
100908095
1008070
10070
output:
Labs Projects Tests Final Exams
100908095
1008070100
70
[import java.util.Scanner;
import java.io.*;
public class MyGrades
{
public static void main (String[] args) throws IOException
{
int lab, project, test;
int finalExam;//Par and Player values
[Code]...
not sure if I code wrapped it correctly
I have the following code....................
double[][] cmMatrix = eval.confusionMatrix();
for(int row_i=0;row_i<cmMatrix.length; row_i++){
for(int col_i=0;col_i<cmMatrix.length;col_i++){
myConsole.getOut().println(cmMatrix[row_i][col_i]);
myConsole.getOut().println("|");
}
myConsole.getOut().println();
}
What do I need so that each row is printed out on a single line ?
I have to read data from a text file and print it in a new text file. An example of one line is like this:
Johnson 85 98 75 89 82
I then have to take the average of all the numbers and assign a "grade" to the numbers for each line of the text file and make a new file so it looks like this for 10 lines:
Name 1 2 3 4 5 Average Grade
Johnson 85 98 75 89 82 85.80 B
My problem is extracting the data from the file so I can use it.
I want to take input in the following way:
Sample Input 1
3
45 3 14
Sample Input 2
5
12 34 5 56 7
The first line is the number of test cases and the second line is the corresponding values for the test cases. Java code for taking multiple inputs in the single line separated by a space.
i'm currently going over single linked list, and i'm coming across an error which i do not know how to get by. I'm using single linked list for now just for study purposes, then i would move on to double.
Error: No enclosing instance of type LList is accessible. Must qualify the allocation with an enclosing instance of type LList (e.g. x.new A() where x is an instance of LList).
public class LList {
private static class Node<E>{
private E data;
private Node<E> next;
[code]....
i'm currently studying over single linkedLists and i'm just writing various methods for it. One method i'm currently stuck on is writing a remove method where it returns a boolean true if its found and it will delete it, and false if the target isn't found. My problem is that it always comes up as flase and i know that the target is in the linked list. Here is the code for my method.
Java Code: public boolean remove(E item){
Node<E> ptr = head;
while(ptr!= null && !item.equals(item))
ptr = ptr.next;
if(ptr.data.equals(item)){
ptr.next = ptr.next.next;
[code]...
package progProject5;
// Implementation of single linked list.
public class SingleLinkedList<E> {
private Node<E> head = null;
private int size = 0;
// Methods
[Code] ......
I am in learning process and I know its very basic question but I got stucked at addAfter() where I need to insert the node after the given node.
I have a tool that outputs a UTF8 file. This file is to serve as an output to another utility that functions with a UTF16 input.Is it possible to write a small script that will convert the UTF8 to UTF16 so that I can put it in a batch file.
View Replies View RelatedI 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]....
I have some class called sorted to sort the linked list through the nodes of the list. and other class to test this ability, i made object of the sort class called "list1" and insert the values to the linked list.
If i make other object called "list2" and want to merge those two lists by using method merge in sort class. And wrote code of
list1.merge(list2);
How can the merge method in sort class know the values of list1 that called it as this object is created in other class.
I'm trying to build a program that contains the ability to:
(1) insert new node at head,
(2) print out contents of the list in order,
(3) remove first node from head,
(4) remove last node from tail,
(5) find a target value,
(6) give total number of occurrences of a target value, and
(7) give total number of items in list.
The areas I'm struggling with implementing are: (
- remove from tail - I know how to find the final node but I can't quite figure out how to set it to null since its initial type is an integer.
- find a target value - how to make the parameters quite workout so the user can simply input an integer value.
- The solution is probably really simple but I can't figure out how to print out the results of these methods when I call them.
public class Node
{
private int data;
private Node link;
// Node Constructor 1
public Node()
{
data = 0;
link = null;
[code]....
I don't remember where but I faintly recall one of the oracle docs examples (dealing with GUI basics I think) having something similar to
button.add(lbl).addIcon().addActionListener(al);
but only in the aspect of using .method.method.method
The reason I'm asking is because I want to shorten this
int j = 0;
for(int i = 0; i <= 6; i+=3){
pnl[j+2].add(lbl[i+5]);
pnl[j+2].add(lbl[i+6]);
pnl[j+2].add(drop[j]);
pnl[j+2].add(lbl[i+7]);
pnl[j+2].add(btn[j]);
j++;
}
Into something like this
int j = 0;
for(int i = 0; i <= 6; i+=3){
pnl[j+2].add(lbl[i+5])
.add(lbl[i+6])
.add(drop[j])
.add(lbl[i+7])
.add(btn[j]);
j++;
}
I might be way off though... but I'm just wondering under what circumstances would this be possible
When I try it in Eclipse a little notification appears that says...
"The method add(PopupMenu) in the type Component is not applicable for the arguments (JLabel)"
When I google 'Component' I see it appears to have something to do with Serialization (which I'll need to look into)
I am trying out solving the question but i am stuck.The problem is to write a method that print data of single linked list backward using stack.The question is as follow
public class Stack{
public boolean isEmpty(){};
public void push(int n){};
public int peek(){};
public int pop(){};
}
public class node{
int data;
node next;
}
public class list{
node first;
}
I am new to Java and have read books, the Java docs, and searched the Internet for my problem to no avail. I have an Array of objects that contains strings. How can I get the object's strings to print in a list so that the user can select that object to manipulate its attributes? For example, the user can select "Guitar 1" from a list and manipulate its attributes like tuning it, playing it, etc. I have a class called Instruments and created 10 guitar objects.Here is the code:
Instrument [] guitar = new Instrument[10];
for (int i = 0; i < 10; i++) {
guitar[0] = new Instrument("Guitar 1");
guitar[1] = new Instrument("Guitar 2");
guitar[2] = new Instrument("Guitar 3");
guitar[3] = new Instrument("Guitar 4");
guitar[4] = new Instrument("Guitar 5");
guitar[5] = new Instrument("Guitar 6");
[code]...
a project I am working on. Its a program that creates a singly linked list that stores names and high scores and prints them. For some reason it is printing an entry extra times. Also my remove function is not working properly
GameEntry class:
package project;
public class GameEntry implements Comparable<GameEntry> {
private String name;
private int score;
public GameEntry(String n, int s) {
name = n;
[Code]...
By using FileReader, FileWriter and their constituents, I am creating a file to contain employee information ( name, age, hours, etc. ). The user is to input all of the data on a single line and we were asked to implement StringTokenizer to assign that data to the file. I have never used the StringTokenizer before, but I have a rough idea how it is to function. I used pw.println to test what I have so far, now I would like to let the user build the initial file with the "first employees" of the company, and then view the file, and then go back and append new employee data to that same file. My question is, how can I take the user input as a StringTokenizer and add that to the file?
In the for loop below, I thought I would see if it would work, but it does not. The loop only executes once and does not allow me to enter data.
public class Records {
public static void main(String [] args) throws IOException {
Scanner input = new Scanner(System.in);
FileWriter fw = new FileWriter("dbs3.java");
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter pw = new PrintWriter(bw);
System.out.println("NEW EMPLOYEE DATA SHEET");
System.out.print("Number of new employees: ");
int number = input.nextInt();
[Code] ....
If I set a Jlist to contain an array of objects, how can I display properties of each object instead of the object array list itself. Ex:
Instead of:
Person1
Person2
Person3
display values such as each person name within the Jlist:
Mike
Paul
Andrew
I have just started working with linked lists. I have a linked list of Objects and I want to be able to search for a specific object. But currently my code continues to return false. Also how would I go about removing the first index of the linked list.
public static void main(String[] args) {
LinkedList<Cookies> ml = new LinkedList<>();
int choice = 0;
while (choice >= 0) {
choice = menu();
[Code] ....
is there a way, to convert a List of Integers to Array of ints (not integer). Something like List<Integer> to int []?
View Replies View RelatedI want to store a String.split("seperator") to a Set<String>.
Example:
Java Code: Set<String> = (Set<String>) "a|b|c".split("|"); mh_sh_highlight_all('java');
Sadly String[] and Set are incompatible types.
About the same as using .add three times, but shorter.
I woud like to convert a string(which is in an array) to a custom object.
Also, if I have different custom objects, will it be ok if I use
ArrayList<Object> o = new ArrayList<>();?
I am suppose to have a method called save() which should marshall the list of computer parts in the right panel to an XML file. In reverse, another method called load() that should unmarshall the saved XML file back into an object. So basically, the Save event will call save() method and save the list of parts in the right panel to an XML file. The Load event should clear the right panel, and call load() method. When load() is called, it should display the unmarshalled data in the right panel. I got "Exit" to work.
I'm having hard time figuring out the "Load" and "Save" parts though.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PCParts implements ActionListener{
[code]...
I am creating a java plugin for moving data from cassandra database to elastic search.
I am getting all the data but the date which I am getting from the database is in human readable form ie Row[Fri Jul 25 11:36:10 IST 2014].
I want this to be converted to epoch timestamp format like 1414386721. How to do this.
How to get the date from the row object above ie I want to get the date from Row[Fri Jul 25 11:36:10 IST 2014].