Faster algorithm.... I want to know whether a number n1 is divided by n2 without remainder. I know I can simply write if (n1 % n2 == 0) ... But it's not fast enough.
Currently I use:
double div = (double) n1 / (double) n2; If (div == (int) div){ ... }
This is faster than the mod operator. I just look forward to any micro optimizations or such.
To evaluate a nth degree polynomial for a given value of x using JAVA PRG.
E.g. 5x^7 + -2x^5 + 6x^3 + 1x^0 at x=2
The program must read in the number of non-zero terms in the polynomial followed by the co-efficient and power of each term. The value of x is read from the used and the program display the results of the evaluation of the polynomial. Use array list to represent the polynomial.
Test Case 1: Input: No of terms: 4 Term n-1 to 0 (both coeffient and power ) 5 7 -2 5 6 3 1 0 x = 2 (say)
Write java codes for the following LinkedList base program:
The program should have following three classes:
Node.java , Polynomial.java, Project1.java
A one-variable polynomial of degree n is an arithmetic expression of the form:
a0+a1 x+a2 x^2+..........+an x^n
where a0 a1,a2, ......, an are the coefficients. Design and implement a class named Polynomial that uses a singly-linked list to store the coefficients (so there is virtually no limit on n ). Include a method that adds two polynomials and another method that multiplies two polynomials. For example, the following two polynomials
2 + x^2 - 3x^3 and 1 - x - 2x^2 + 3x^3
are represented by 2, 0, 1, -3 and 1, -1, -2, 3, respectively. The sum of these two polynomials is
3 - x - x^2
which is represented by 3, -1, -1; and the product of the two polynomials is
2 - 2x - 3x^2 + 2x^3 + x^4 + 9x^5 - 9x^6
which is represented by 2, -2, -3, 2, 1, 9, -9.
Note that you must write your code to maintain and manipulate the linked list data structure (i. e., do not use a utility library such as java.util.LinkedList). Email one week before the due date to get a data file to test your program. The data file will contain several pairs of polynomials. Each polynomial is given on a separate line (with coefficients separated by space instead of comma), and there is an empty line between two pairs. Your Java program should read and echo each pair of polynomials, compute and report their sum and product, and go on to process the next pair until the end of input. Specifically, the main method must look like:
while (not end of input) { read and echo a pair of polynomials P1 and P2;
output sum (P1, P2); // Static method returning a polynomial output product (P1, P2) // Static method returning a polynomial }
Hand in a program listing with clear internal documentation and a printout of the results of execution using the test data file. Also email all JAVA program files (Node.java - the same as the one given in class except for the element field that becomes int type for this project, Polynoial.java, Project1.java) so your work can be easily recompiled and tested.
Data file will be like: coefficients of polynomials, not exact, just for as an example of
(The data file will contain several pairs of polynomials)
2 3 0 1 -3
1 -1 -2 3, 9
Output will be in same format with sum and product: coefficients of polynomials, not real, just for as an example.
I need to process one component drag to the table. I misunderstand, how I can see to which Cell fall the component. I tried to use Event and Mouse event handlers in my custom Cell, but they do not work. I can copy the drag event to the table and table handles it, but how to get needed Cell I cant understand.
This is my codes in a button that if I click it . that information will send to Jtable but the problem is the jtable is in another frame so how can i connect this ?
DefaultTableModel model = (DefaultTableModel) new admin().tableBagtags.getModel(); if (txtName.getText().equals("")) { JOptionPane.showMessageDialog(null, "Please fill out all fields.", "Error!", JOptionPane.ERROR_MESSAGE);
I am new to java i dont understand the difference between the abstract and inheritance i mean we use the abstract class with extends with other class name ,even we do that same in the inheritance pls tell me main difference between abstract and inheritance...
I have been tasked with creating an invoice (school assignment). Part of the calculations is creating an interest depending on the amount of days between the current date entered, and invoice date entered (The program prompts the user to enter both the current and invoice dates by asking for the day, month and year).
We are also supposed to set the contructor to a default date of 1/1/1900.. but I don't know how or where to code that.
How to calculate the difference between the CurrentDate and Invoice. I have displayed the dates to the user as follows.
I have just begin to understand collections in Java. I read about the differences between LinkedList and ArrayList but have several doubts on it. I have mentioned them below
1) Why retrieving in ArrayList is faster then LinkedList?. Since both have the get method how does performance differ?.
2) How does re-sizing happens internally in ArrayList when a item is added or removed?. How slow this is compared to the pointer re-shuffling in LinkedList when a item is added or removed?.
I read that InputStream is used for byte based reading it reads 1 byte at a time.And InputStreamReader is used for charcter based reading so it reads one charcter at a time so no need to convert this first to int then read it.Here is reading using InputStream.
input=new FileInputStream("D:/input.txt"); int c; while((c=input.read())!=-1) { System.out.print((char)c); }
and here is reading using InputStreamReader
input=new FileInputStream("D:/input.txt"); reader=new InputStreamReader(input,"UTF-8"); int c;
so what is difference between InputStream and InputStreamReader in both case i have to use a Int and then read it and at the end if I want to print that data I have to cast that with "(char)c".So what is advantage of using InputStreamReader?
I know that oracle has released a statement saying that JavaFX will eventually replace Swing. What is the advantage of JavaFX? The new format, using "stage" instead of JFrame, seemed weird. Why is this change necessary? What benefit do we reap from JavaFX that Swing does not have?
Im working on my homework and it mentioned element for one exercise and an index in another, what is the difference, If Any, Between An Element And An Index?
If I am making an application using Java SE8 and I use new concepts of JavaSE8 like "Lambda Expressions" and "Default Methods".
After completing my application I give it to client who are using Java Platform less than 8 like Jdk1.7._; then will this application will work fine as it is working on JavaSE8.
a JavaSE8 application works well on Java SE7 platform.
I know this has been covered before but none of the answers made sense to me. I'm hoping there is an easy way to do this. I have 2 user inputted strings that I have converted to dates and I just want the difference in days.
My code :
import java.util.Date; import java.text.SimpleDateFormat; import java.util.Scanner; import java.text.ParseException; public class DateTest { /** * @param args the command line arguments */ public static void main(String[] args) throws ParseException {
[Code] ....
Apparently I can't just subtract the dates like I would in VB.
I have finished a Java 101 class but the most we did was create a gui for a timer program. I figure I need more training and every book I pick up wants to teach me hello world and the difference between a class and object again.