How To Perform Row Operation - Store Data Into 2D Matrix

Sep 18, 2014

I am able to perform column operation but not able to perform row operation because i am not able to store data say a 2 matrix [][]. I need to store the data into a 2-D matrix. Here is my code:

Java Code:

import java.awt.List;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Scanner;
public class colRowRead {

[Code] ....

I tried something like that:

for(int i=0; i<rows; i++) {
for(int j=0; j<cols; j++){
matrix [i][j]=textFile.get(i).split(" ");
//System.out.println(matrix[i][j]);
}
}
*/ mh_sh_highlight_all('java');

File col.txt is like this:

Java Code:
5 9 7 1 5
3 6 8 6 8
4 6 7 8 9
9 8 3 5 7 mh_sh_highlight_all('java');

View Replies


ADVERTISEMENT

Read Text File And Perform Operation On Specific Columns

Dec 9, 2011

I am somewhat of a java newbie (learned it awhile back and just getting back to programming some again.) I have a text file of data much larger than this, but here are the first ten rows and first 10 columns.

39755320111041730140.633038085-2.117082366149.069997
39850320111041730150.633038085-2.117082511148.309997
39955320111041730160.633037998-2.117082293149.509997
40055320111041730170.633037945-2.117082351149.239997
.......

I can read and write all the data back out to files. But I am not sure about a few things.

First would it be best to use BufferedReader and OutputStream such as:

public static void main(String[] args) throws IOException {
BufferedReader bReader = new BufferedReader(new FileReader ("testdata.txt"));
BufferedOutputStream bytesOut = new BufferedOutputStream(new FileOutputStream ("outfile.txt"));

Second, I was then going to initialize an array but I might have 30 or more columns of data, of which I might perform and output only 10 columns to my output.txt file so is this a good way?

Third, I only want to perform operations (such as average the data, convert units or multiply two columns together) on 10 of the 30 plus columns and print out results to output.txt file. For example, In testdata.txt file above, I want to skip first seven columns. I then want to take column 8 and multiply by 100 then divide by 3 and output result to output file. I want to do same for column 9. Column 10 I want to multiply by different number (by 3.5).

View Replies View Related

Program That Implement Final Method And Perform Arithmetic Operation

Mar 4, 2014

class A
{
public final int Add(int a,int b) {
return a+b;
}
}

class B
{
public static void main (String args[])
{
System.out.println(Model.Add(5,10));
}
}

This is what I have. I'm not sure if this even makes use of a final method. But when I run it I get an error saying cannot find symbol for line 13.

View Replies View Related

Design Calculator Using Stack Data Structure To Perform Additions / Subtractions / Multiplications And Divisions

Jul 18, 2014

I've beginning a new assignment and would like some feedback on my outline for the program. You are to design a simple calculator using the stack data structure to perform additions, subtractions, multiplications and divisions. The user may enter an arithmetic expression in infix using numbers, parentheses and arithmetic operations (+, -, *, /). After an expression is entered, its postfix or prefix notation is displayed and then the result of the expression. You are required to design your own infix to postfix and infix to prefix conversions.

The professors example includes: SinglyLinkedList implementation, a Stack that implements Stack interface and extends SinglyLinkedList, a Node class, and StackApp -- in addition to the main class and the prefix/post-fix classes.

(The equation is entered/stored as a string variable)
System.out.println("Enter equation: ");
equation = input.next();
equation.trim();

(1.) Get the user input:
- evaluate the user input and use a stack to determine the correct prefix/post-fix notation.
- from the stack, pop each item:
a. account for '(' and ')' to push all operators and write all operands until ')', then pop/write
b. store new equation into a list (in prefix/postfix notation)

(2.) Display the list in both notations to the user.

(3.) Perform the calculation.Do you think it will be alright to calculate the original equation that was entered? It seems too much to then design a class that will then cycle through the polish notation and calculate according to that format.

View Replies View Related

Checking If Matrix Is Upper Or Lower Triangular Matrix Based On User Input

Dec 5, 2014

java program that will determine if the matrix is a lower or upper triangular matrix. I only need to use java.util.Scanner;.

View Replies View Related

How To Store Data

Jan 15, 2015

I am new to Java programming and how to store data in Java.....Here is a example:Unique number, description, qty in box, price...There are thousands of these in my list. What would be the best way to store them.

View Replies View Related

How To Store ResultSet To Other Data Structures

Oct 28, 2014

I have a java query like this

query ="Select major_career.Major_Title, career.ISCOTitle,career.FS.... " //only partial,
// I swear the query is correct
resultSet = statement.executeQuery(query); //this executes it
relArr = new ArrayList<String>(); //don't worry it is intialized

In the code below I tried to store the resultset components into the arraylist

int j = 1;
while (resultSet.next()) {
while(j<=numberOfColumns){
relArr.add(resultSet.getObject(j).toString());
j++;
}
} // end while

I am not sure whether the arraylist is able to store the result set because when i try to display it like show below it only shows some rows and only the first column

Iterator it = relArr.iterator();
while (it.hasNext())
{
System.out.println(it.next());

I want to manipulate the resultset results in my program by copying the resultset values to other datastructures.

View Replies View Related

Data Type That Can Store Methods

Mar 21, 2015

I was wondering is there any data type that can store method?

View Replies View Related

Store Data By Their Ascending IDs Using Java

May 8, 2013

I am making a program to read data from excel files and store them in tables by their IDs. I have managed to read all the data from excel files as a string and store them in a table. But my project is to store them in table by ascending IDs. I have created the comparator in another class but when i call it in the main class nothing happened. The data that I have to store is like the below:

ID     Name     Salary     
50     christine     2349000     
43     paulina     1245874     
54     laura     4587894     
23     efi      3456457     
43     jim      4512878     

The codes are below:

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

[URL] ....

View Replies View Related

Servlets :: How To Store List Of Data Of A Database In ServletContext

Feb 5, 2014

i am newbie to servlet and m working on a project like online shopping. I have list of data items in my database and i am able to fetch and display the data from database but i want to know that how can i store these data items in ServletContext so that i can use use it frequently in other pages.

View Replies View Related

Web Application Which Takes In Data From Form And Store In Database

Jan 1, 2015

I am trying to develop a new web application which takes in data from a form and stores data in a database.I have included all the three files join.jsp(the form which takes in data),reg.java(servlet) and JavaConncetDb(method which connects db and servlet). I get a 404 error when i try load the web application.

My file structure in eclipse

The error I am getting

join.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

[Code] .....

View Replies View Related

Store Data From A File Into Array Of Type Product?

Mar 17, 2015

public class InputFileData {
/**
* @param inputFile a file giving the data for an electronic
* equipment supplier’s product range
* @return an array of product details
* @throws IOException
*/
public static Product [] readProductDataFile(File inputFile)
throws IOException{
// YOUR CODE HERE
}

This code is meant to be used to read a text file and store the data in an array of type Product[]. I know how to read in a text file and have it sort it into an array, but I've never seen code laid out in this fashion before (specifically "public static Product[]", and I'm unsure how to work with "(File inputfile)". I've looked all over the place but can't find any examples of anything like this.

Also, the code given cannot be changed, as it's that code I have to work with.

I still don't understand how to use it as a whole. For example, do I read the file in the main and have this method read that in and output to the Product class? Do I read the file in this method? I can't work out how to make this work when I have to use this method.

View Replies View Related

Creating Feedback Form In JSP Which Will Store Data In Database Directly

Dec 24, 2014

I want to create few forms in our project. I searched in web, All are PHP form Generator only not for any JSP. I could see one JSP form Generator Site. But the Content will store it in their Server. How to create Feedback form in JSP which will store the Data in Database directly.

View Replies View Related

Get Data From Config File And Store In Array Without Using Split Method

May 8, 2014

How i can get the data from a file, for a key that have multiple values without using split method and i want to store that data in an array

file name:"new.txt"[contains below data]
Name=google.com, yahoo.com,facebook.com
Attachment=abc1,abc2,abc3

I am successfully able to do this using following code

Properties props = new Properties();
String configFilePath = (Cjava_confignew.txt);
props.load(new FileReader(configFilePath));
String TestName = props.getProperty(Name);
String test[] = TestName.split(,);

Now i just want to store the values for key "Name" in array without using TestName.split(,); but i am not able to do this.

I have also used .yml file to avoid this but did not succeed, some way to do this

file name test.yml

Name
-google.com
-yahoo.com
-facebook.com

Attachment
-abc1
-abc2
-abc3

i want to store multiple values for single key(Name) within the array

View Replies View Related

Operation With Strings

May 6, 2014

I have to write a java programm,where i have given string. Output should be like that:

1. print only once what characters are apearinng in string, and the last index of it

2. print how many characters are in the string

I have to do it only with loops,no special classes

So far:

public static void main( String[] args ) {
String besedilo = "Testiranje";
besedilo = besedilo.toLowerCase();
for (int i=0; i<besedilo.length();i++)

[code]...

View Replies View Related

Mathematical Operation On Bytes

Jan 28, 2015

byte a1 = 0;
byte a2 = 4
byte a3 = 4;

//below statement gives a compilation error
a1 = a2 + a3;

//below line compiles fine.
a1 = 4 + 4;

View Replies View Related

String To Math Operation

Sep 14, 2014

Given a string of numbers and operator. Compute as follows:

Consider, "000293000002030403+0400293059694" is the input.

a. Separate the two operands and one operator:
"000293000002030403" "+" "0400293059694"

b. On each string operand, take each digit. ADD them all.
(2+9+3+2+3+4+3) + (4+2+9+3+5+9+6+9+4)
The two string operands should now become two integers.

c. Lastly, perform the operation using the string operator specified on the original string.
26 + 51 = 77

I don't know why I get the sum of 52 when I use a for loop.

Here are my codes:

public class string2math {
public static void main(String[] args) {
String input = "000293000002030403+0400293059694";
String [] operand = input.split("+");
String firstOpera = operand[0];

[Code] ...

View Replies View Related

Addition Operation On Character Variables

Feb 8, 2015

When addition operation is performed on the character variables ,then it specifies actually that the ASCII values are added because the character variable stores ASCII value of the character constant ,then why after the addition the result cannot be stored inside a character variable ,why it needs to be stored in an integer variable only ,when actually the character variable stores the ASCII value then why is it an error to store the added result in an character variable.

View Replies View Related

Swing/AWT/SWT :: JDialog Close Operation

Mar 4, 2011

how the entire application could be close when you click on X in a JDialog Box. I have tried

System.Exit (0)

but it only close the Dialog box

View Replies View Related

Using Queues To Simulate Airport Operation

Nov 13, 2014

*Write a program to simulate this airport's operation. You might assume a simulated clock that advances in one-minute intervals. For each minute, generate two random numbers: If the first in less than LandingTime /60, a "landing arrival" has occurred and is added to the landing queue, and if the second is less than TakeOffTime /60, a "takeoff arrival" has occurred and is added to the takeoff queue*.

*Next, check whether the runway is free. If it is, first check whether the landing queue is nonempty, and if so, allow the first plane to land; otherwise, consider the takeoff queue. Have the program calculate the average queue length and the average time that an airplane spends in a queue.*

I have most of the code done as you can see below:

* Queue Interface: Queue.java
* Queue Implementation: ArrayQueue.java
* Demo Program: Airport.java

Right now, I am stuck on the first calculation which is trying to figure out the average size of the landing queue. For some reason, as you can see at the bottom of my demo program, the average always comes out to be 0.0 and I'm not sure what's wrong.

Secondly, how to calculate the average time a plane stays inside a queue for. Write a program to simulate this airport's operation. You might assume a simulated clock that advances in one-minute intervals. For each minute, generate two random numbers: If the first in less than LandingTime /60, a "landing arrival" has occurred and is added to the landing queue, and if the second is less than TakeOffTime /60, a "takeoff arrival" has occurred and is added to the takeoff queue.

Next, check whether the runway is free. If it is, first check whether the landing queue is nonempty, and if so, allow the first plane to land; otherwise, consider the takeoff queue. Have the program calculate the average queue length and the average time that an airplane spends in a queue.

I have most of the code done as you can see below:

* Queue Interface: Queue.java
* Queue Implementation: ArrayQueue.java
* Demo Program: Airport.java

Right now, I am stuck on the first calculation which is trying to figure out the average size of the landing queue. For some reason, as you can see at the bottom of my demo program, the average always comes out to be 0.0 and I'm not sure what's wrong.

Secondly, how to calculate the average time a plane stays inside a queue for.

View Replies View Related

Recursion - If Else Loop To Check If Operation Is Completed

Feb 2, 2014

I am currently learning recursion, and i have a query. I have a program that receives user input, and outputs the decimal input into binary form. In my recursive function, I have a if else loop to check if operation is completed.

public static int Converter(int input, int weight) {
System.out.printf("Input is now %d, weight is now %d
",input,weight);
if(input==0) {
return 0;

[Code] .....

The final return, when input finally hits zero is concatenating 0 to whatever i have this far. e.g. Decimal 10 should give 1010, but because of the "return 0", instead of getting 1010+0, i am getting 10100.

I can solve the problem by creating a variable sum,and passing along, but i am just curious why the final return 0 is giving me not a +0, but a concatenate 0.

View Replies View Related

Program To Simulate Operation Of Simple Robot

Apr 26, 2015

Write a program to simulate the operation of a simple robot. The robot moves in four directions: Forward, backwawrd, left, and right. The job of the robot is to move items and place it in the right slots in each station. There are 8 stations plus the pickup station. Pick up station is the initial start where the robot picks the items. 8 items can be placed on each station. The nearest station must be filled before placing items on the next station. The items are marked with identification or serial numbers. The items with odd serial number go to the right and items with even number go to the eft. The last slot, number 7 is reserved for light items which are less than 80kg. The serial number is a five digit number, the MSB digit 5 indicates that the product must be placed in the fifth station which is keeping the product at 20 degree F.

View Replies View Related

Invalid Operation At Current Cursor Position

Sep 30, 2014

I have now slowly moving on the learning Database Connectivity.Found a simple example on one site and tried to execute it, Creating a database, connecting to it and displaying the output.

I am getting trouble with recordset in displaying all the records in the badabase. It displays the very first record correctly but if I try to enclose it in while(rs.next()) loop, it generates an error message saying "Invalid operation at current cursor position".

package database_console;
import java.sql.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.ResultSet;

[code]....

View Replies View Related

Arithmetic Operation - String Index Out Of Range Error?

Nov 17, 2014

I am trying to write a program which asks the user to enter two numbers and then do the arithmetic operation based on user's input . No compiling errors but when I run the program I keep getting "StringIndexOutOfBounds" error .
 
class arithmetic { 
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int ent1 = 0;

[Code]....

View Replies View Related

Servlets :: Clean Way To Log Every Database Operation Issued By Which User

May 16, 2014

So, there's a new requirement to log which user issues what database operations. The dumb way is to pass the session object around, but I hope said dumb way is not the only way to achieve this. Hopefully there's another cleaner and smarter way to do this.

View Replies View Related

How To Perform Soft Delete

Feb 25, 2014

how to do soft delete?

View Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved