35,619 Topics
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| | I am having a problem to understand how class inhertance works in Java.. Now I want to get information from a class to another and let's say we have class A and class B class A contains a string an int and a byte class B contains a String and …  |
| | I was just wondering if someone could maybe set me on the right track or tell me exactly how to do what I am about to ask. I have a bunch of answers in a notepad file, such as TFTABCD (going downwards, a letter per line), how can I make … |
| | public class W4P7{ public static void main(String []args){ int [] myArray = {11, 29, 21, 23, 33, 32}; method(myArray); }//end of main /****************start of method****************/ public static void method(int [] x) { int swap; for(int i=0; i<x.length;i++){ for(int j=0; j<x.length-1;j++){ if(x[j] > x[j+1]){ swap = x[j]; x[j]=x[j+1]; x[j+1]=swap; }//end of … |
| | I am trying to read a random line from a file and if that line is null it will create a random string. It works with files with upto and including 5 lines. To test it I made a 2 line file: > 1-hello > 2-but However, when run it … |
 | in an assingment, i have to implement a deque ( double ended queue ). the underlying datastructure is allowed to be arrays or linkedlist. only that im not allowed to use any prebuilt java api that does the above. (like the java.util.LinkedList api) implementing the above using doubly linked list … |
| | Loop trough a HashMap <String, Integer> and if the value is something, for example, 5, then put the key in an array. I'm not sure where to start, I'm having trouble on the "Loop trough a **hashmap**" part. Thank you.  |
| | Hey Guys, I'm want to output a calculation to a JLabel. Example: double num1 = 14; double num2 = 3; double ans; ans = num1/num2; JLabel jl = new JLabel(); add(jl); jl.setText("The Answer is: " + ans); Currently the answer for this will be 4.666666667. Now if this was a … |
 | Hi Guys, I am creating a system to work on a database adding updating etc. And the combo boxes are giving me trouble. The process is as follows. The user searches for a business by location once entered all business for that area are then displayed name address owner etc. …  |
| | Hello I am trying to insert some data into a sql server i have but it seems like I'm formating the information wrong. This is what i have so far. product id = int; type = string; watt = float; volts = float; String query = "INSERT INTO GoodCustomer(Product ID, … |
| | Hello, I have a Mysql table, where i want that after i execute the update query in the JSP form, an automated mail is send to the email id in the record.Can anyone tell me how to do this? |
 | Please am new to java and i need an assistant on loading hexadecimal from a textfile and converting it into binary(Loader class) then the binary will be kept in another class(memory class). then the binary will be forwarded to another output file. |
| | please help me to explain the two dimentionalsales about sales person: 1. while 2. do- while 3. if 4. if-else 5. for |
| | Hi everyone. I am currently doing small exercises on classes. Suppose you have 2 classes: Person (superclass) and Student (subclass) the class Student is extending the class Person. When creating new objects of type Student, when do use the following options: option 1: student x= new student( ..); option 2;( … |
| | The problem with my code is that the update method doesn't get invoked even after I notify the observers. Did I miss something in my code? package com.observer3; import java.awt.FlowLayout; import java.util.Observable; import java.util.Observer; import javax.swing.JLabel; import javax.swing.JPanel; public class A extends JPanel implements Observer{ JLabel lbl; public A(){ setLayout(new … |
| | Hey guys, can anyone tell me how I could use randomaccessfile to read in a txt file and copy the content to a tree? Also how to then do the opposite and write newly changed nodes from the tree onto the text file? It's pretty much like creating a save … |
 | Hi, i'm trying to use an `AffineTransform` to transform a point to pixels on a 400x400 canvas. What kind of transform would you use? For example: given the points (-1, 1) --transform--> (0, 0) (pixels) (1, 1) --transform--> (400, 0) (pixels) (-1, -1) --transform--> (0, 400) (pixels) (1, -1) --transform--> … |
| | Hi, started programming 2 days ago, and i'm having a problem with Java saying one of my variables isn't initialised. Couls someone help please?! Thanks, code below: public static void adding() { int n = getN(); int total; for (int i=1; i<=n; i++) { total = i + 1; } … |
| | I have less than a day to understand and learn evrything there is to know about arrays and to be able to know what the output for a code on arrays will give.. I was hoping someone will be able to suggest any good sites etc.. from which i can … |
| | Hello, I am taking my second Java course this semester CSC-251 (advanced Java). I took introduction to computer programming last summer. With three programming courses under my belt will I be able to find a job out there in the real world? For a little background information about myself. I …  |
| | Was not sure where to post this, but let this a go. I m on my final year. And I have discovered in myself a passion for programming in C and started learning it but it is all in a beginning stage. I really bored of Java or I just … |
| | i need to make the Print JMenuItem to open a printdialog box when clicked but i dont know how to make it can u help me pls p.addActionListener(new ActionListener() heres the code can u add the printdialogbox i searched but i cant put it on the program import javax.swing.*; import … |
 | How can I work out these questions?? Would really appreciate your help. things like looking for things in the Hashmap. • isRally - takes a String containing a rally code as a parameter and returns true if it represents a rally object stored in the allRallies collection, and false otherwise. … |
| | So we are working on loops right now, I got the first portino of my program up and running how I want, took some messing around with but I finally got it. Here is my assignment: > Credit Card Number Check. The last digit of a credit card number is … |
| | hello there I m trying to do database connectivity with sqlserver2000 it runs if i write that code in a normal java file but if i run that code with jsp file it gives an exception com.microsoft.jdbc.sqlserver.SQLServerDriver Although i hav set the CLASSPATH of Jar file for sqlserver 2000 here … |
| | //Hello(apologize for any formatting errors) //I am trying to finish this program that is supposed to act as a club bouncer. Only letting a max amount of people (125) in at one time. Naturally people leave throughout the night, so I was trying to //implement that with the random variable, …  |
| | Hello guys. I'm getting an error as follows: Error I get on the browser:- type Exception report message: descriptionThe server encountered an internal error () that prevented it from fulfilling this request. exception: org.apache.jasper.JasperException: PWC6033: Error in Javac compilation for JSP PWC6199: Generated servlet error: string:///GuestBookView_jsp.java:8: cannot find symbol symbol … |
| | HI, I have a class Customer and Vehicle. Fist a customer needs to be added to the application. when a vehicle is being added the customer id needs to be added also so i wrote the code as below @Override public void addVehicle( String make, String model, String year, String … |
| | Hello, What is the best way to check my code? I have written a program that counts the swaps required to sort an integer array using the Bubble, Selection, Insertion and Quick sort methods. How can I be absolutely certain that my swap counts are correct? Will someone take a … |
 | who learn java with me if any one then ask me question ???????????????????  |
| | ResultSet rs=st.executeQuery("select * from category"); rs.moveToInsertRow(); rs.updateString("cname",c); rs.insertRow(); rs.moveToCurrentRow(); i want to insert new row in table of sqlserver2000 database the row should insert at last in a table .can i use variable at place of value in updateString("column name","value") the code i m using is here |
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