Java Object Stored In Array?
Apr 8, 2014
I have been having trouble with a recent hw assignment requiring us to sort user defined data types in an array. so far, i have implemented the sorting algorithms correctly but i cant seem to store a string and an integer together. I have an employee class
[public class employee {
private String Name;
private int IdNumber;
public employee(int IdNumber,String Name){
this.Name=Name;
this.IdNumber=IdNumber;}
[Code] .....
And in my app, i create a employee object-----> employee john=new employee(1020, "John");
How can I prompt my insert method to take in employee id and string name together?
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Jul 31, 2014
I'm facing a problem in below scenario:
List lst = tDAO.executeReport();
lst contains list of objects and one of the objects contains the property bDate(Timestamp) which has the value 28-2-1989 00:00:00.0, now I just wants to change the value into 28-2-1989 and store it back into the List as a Timestamp. how can I do that.
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Jul 9, 2014
Modify class Time2 to include a tick method that increments the time stored in a Time2 object by one second. Provide method incrementMinute to increment the minute and method incrementHour to increment the hour. The Time2 object should always remain
a) incrementing into the next minute,
b) incrementing into the next hour and
c) incrementing into the next day (i.e., 11:59:59 PM to 12:00:00 AM).
how to manage case 4 stuff and what's the problem of this CODE.
import java.util.Scanner;
public class Time2Test
{
public static void main( String args[] )
{
Scanner input = new Scanner( System.in );
Time2 time = new Time2();
// input
System.out.println( "Enter the time" );
System.out.print( "Hours: " );
time.setHour( input.nextInt() );
[code]....
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Oct 6, 2014
I just forgot to increment n while trying to store the humidity... I do this every time and I suddenly realize what I did wrong ...
My problem is that after printing humidity[n] in the "Humidity(%)" row, it seems that humidity[n] becomes 0. I checked like this:
System.out.println(humidity[5] + " " + humidity[6]);
In the "Humidity(%)" row, they come out fine, but when I do this, they come out as 0, which I think would explain why my heat indices are consistently lower than the temperature when the temperature is over 80.
My code:
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
public class HeatIndex {
public static void main(String[] args) throws IOException {
System.out.printf("%70s", "Heat Index: Key West, Florida");
[Code] ......
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Feb 23, 2014
The program below is intended to find the arithmetic mean of the numbers stored in the array q in two ways: once by storing the numbers in an ArrayList d, where you allow all the necessary conversions to be performed automatically; and once by storing them in an ArrayList e, where you perform all the conversions by hand. Complete the program.
Here is what I have so far:
double[] q = { 0.5, 2.4, 7.4, 2.8, -6.2 };
ArrayList<Double> d = new ArrayList<Double>();
ArrayList<Double> e = new ArrayList<Double>();
for ( double x : q ) {
d.add( x );
e.add ( new Double ( x ) );
[Code] .....
Why does it still show "a / d.size?" I thought I fixed that. Whatever, it's supposed to be "dTotal / d.size()", etc.
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Jan 23, 2014
Which package or class i can find all the predefined keywords in java like "this" etc...
actually i want to know if this operator is itself final in nature or not from its syntax?
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Sep 17, 2014
I am new to Java Stored Procedures. There is a PL/SQL package in our legacy application(Oracle 9i) which pulls data from Oracle 8i source database through a DB link. Now we have upgraded our databas to Oracle 11g R2 from 9i. So the DB lint to Oracle 8i will no longer work in 11g. Hence I have created a Java stored procedure that establishes JDBC thin connection to the source 8i database. I have loaded the java stored procedure in the database using loadjava and have created a call specifaction.
I have called this java stored procedure inside the PL/SQL package. Now while executing the PL/SQL package, it takes the default driver ojdbc6.jar to establish JDBC connection and fails to connect to the 8i database giving ArrayIndexOutOfBounds Exception. While running the code in the linux application server with classes12.jar the code succeeds. But when the same is called in the database it fails.
1. How can I make my PL/SQL call use classes12.jar while calling the Java Stored Procedure?
2. How can I load the jar file(which includes my classes and the classes12.jar) into the datase as one object? (When I tried to load the whole jar, in database the classes and dependent jar loaded separately)
3. Is there a way to use classpath while calling the Java Stored Procedure like how we do from Unix?
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Jun 15, 2013
I am wondering where the attributes I put into the Httpsession are stored.
For example, if I do the following
HttpSession session = request.getSession();
session.setAttribute("usr", usr);
session.setAttribute("pwd", pwd);
where does the ("pwd", pwd) pair store?
In my case, my web application needs to use the usr and pwd to login to another application, so I have to store them somewhere. So for security reason, if the pwd is kept in the browser side, I need to encrypt it first before I put it in the session. On the other hand if it is stored in the server memory then encryption seems not necessary
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Mar 23, 2015
I'm new to Java. I need to run a SQL server stored procedure(that creates a unique job number) from Oracle SQL Developer (JDBC) in Java. The same Java code will be used in Applescript to run the SP. I found a code snippet online with the similar requirement. How to embed my SP in below code snippet? Below is the Stored Procedure and Code Snippet:
SP
EXEC Int.dbo.GetNewJobNumber '6852', 'Test Job', 'Manual SQL Query'
6852- CustomerCode,
Test Job - Job Title,
Manual SQL query - Shows how new job number was created.
Code Snippet:
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
public class Main {
public static void main(String[] argv) throws Exception {
[Code] ....
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Jun 21, 2013
Can we write java class or code inside Oracle Stored procedure.
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Jul 3, 2013
I am getting " Invalid column index" in java based stored procedure
String resString;
String resString = ("ABCEDFG");
byte[] splitLenArray = {1,1,1,1,1,1,1};
int startIndex = 0;
[Code] ....
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Mar 23, 2015
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
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Feb 28, 2014
I need to add an employee object that my program has created and put it in a array list. My employee object is first name, last name, and a generated id. I am trying to add a new employee object to an array like this:
public static Employee addEmployees(String first,String last) //this method is in my employee class
{
Employee employee = new Employee(firstName,lastName);
employee.setFirstName(firstName);
employee.setLastName(lastName);
employee.getId();
employeefile.addEntry(employee); //add employee object to array list
[code]...
how to println it to test, but I can't seem to do that or know which class to put this function in. I know about for loops and such, just don't know how to implement it or where.
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Sep 28, 2014
this is part of a larger project but i figure if i can figure out this first step i can work the rest. I need to get a title from the user add it to a object array (i think thats what it is) and then when i call listAllItems(), items[] should be copied into a string array called listAllItems, and then printed, but currently im jusst having trouble i think making it an object and then make it an item in the items[], if i run case 3 the list it says null...
public class MediaItem {
String title;
MediaItem(){
}
MediaItem(String title){
[Code] ......
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Feb 21, 2014
I tried the following and it gives me null pointer exception. I just want to verify if what is the actual value of a length of an array?
Object [] obj = null;
System.out.println("length:" + obj.length);
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May 29, 2014
package com.practice;
public class Car {
private String name; //name of the car
private String modelName; //Name of the model
private int year; //The year car was made in
private int speed=0;
[Code] ...
It wont let me copy it into a array is there any solution to this.
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Mar 16, 2014
I need to return all the object name of one class in an array. I have a class named country, and other classes with athletes and medals etc. I need to do a method that list an array with all the countries that participate, so all the objects created with the class country (i.e canada.country, usa.country, etc). Is there a way I can retrieve them?
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Mar 16, 2014
I need to return all the object name of one class in an array. I have a class named country, and other classes with athletes and medals etc. I need to do a method that list an array with all the countries that participate, so all the objects created with the class country (i.e canada.country, usa.country, etc). Is there a way I can retrieve them?
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Oct 2, 2014
I need to be able to call this method and it should take the object and, add it to my list of items, but I am having trouble getting it to work. I know the numbers and stuff aren't correct eventually it will add one to the array length when i call add item, but I am just trying to go one step at a time
//creates new MediaItem object and add it to items[]
void addNewItem(String title){
MediaItem object = new MediaItem(title);
MediaItem[] items = new MediaItem[1];
items[0] = ("object.getTitle()");
numberOfItems = numberOfItems + 1;
System.out.println(items[0]);
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Feb 8, 2015
I am trying to build a method that takes an array of object and adds a new object of that type to the end of it . ONLY ALLOWED TO USE ARRAY , NO ARRAYLISTS VECTORS ECT . i realize that if the array is full you can use the java copy array method to make a new array and double its size until a certain point . The MAX AMOUNT OF OBJECTS is a constant that is 100 but for some reason even when executing my code i keep getting null pointer exceptions or index out of bounds errors , i have written this method many times now with out any success.
My question is how do I write a method that adds an object to the end of an array and if there are no spots left copies the current array into a new array and extend the size
private Animal [] objects;
final int MAX_ANIMALS = 100;
public AnimalObject()
{
objects = new AnimalObject[MAX_ANIMALS];
}
public AnimalObject(Animal[]a)
[Code] ....
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May 5, 2014
Suppose that you have an ArrayList and that it contains String objects. Which declaration of the ArrayList requires that objects retrieved using the get method be cast to Strings before calling a String method?
I. ArrayList a = new ArrayList();
II. ArrayList<Object> a = new ArrayList<Object>;
III. ArrayList<String> a = new ArrayList<String>;
A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III
I know that all of these are ways to declare an Array List, but I am unfamiliar with the last two since I usually just declare my Array Lists with the first option.
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Apr 11, 2014
I am trying to solve involves an object array each object has two instance variables, a string(origin) and a double(price), that was originally unsorted I have already sorted the array. There are a total of 11 possible origins and 6 prices, so obviously some origins share prices with others. The array is sorted by origin alphabetically ignoring case. I now have to write to a file how many instances of each origin there is, tally up all the prices for each origin and a total for all prices. I get bonus points for utilizing the presorted array to my advantage for the final output and calculations.
It would be easy to write a branching statement and tally up all the origins and prices etc... However this is a linear operation and doesn't seem to benefit from the presorted array at all so I came up with what I think is a descent alternate solution.
I was thinking that I could go through the array one object at a time and stop when I came to an origin of the next type. For example: there are 12 names called "Adam" and then a name called "Bob". So if I stop at bob, check the index and add 1 then I know how many Adams there were. I can then continue this process with all the other names, all the while calculating the combined prices and all.
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Jun 6, 2014
I am trying to create an array filled with the object Card. It keep throwing the exception that the "deck is empty". I am not sure why that's happening because the code for filling the array seems fine.
public class Deck {
private Card[] deck;
private CardPile cardPile;
private int numCards;
public Deck() throws InvalidDataException{
this.deck = new Card[52];
[Code] .....
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Oct 12, 2014
Write a program that prompts the user for information about some countries, creates an object for each country, and then stores the objects in an array. After the user has entered information about all the countries, your program should print out which countries in the list have the smallest and largest area and population density. Assume the user will enter information about at least one country but that the program will not have to store more than ten countries in the array. The user will indicate that they are done entering countries by typing "DONE" for a country name. Here is an example of what your program must look like when it is executed (user input is shown bold)
Please enter the name of a country: United States
Enter the area in square km and population of United States: 9827000 310000000
Please enter the name of a country: Mexico
Enter the area in square km and population of Mexico: 1973000 122300000
Please enter the name of a country: Canada
Enter the area in square km and population of Canada: 9985000 35160000
Please enter the name of a country: Liberia
Enter the area in square km and population of Liberia: 111370 4294000
Please enter the name of a country: DONE
Liberia has the smallest area at 111370 square km.
Canada has the largest area at 9985000 square km.
Canada has the smallest population density at 3.521282 people per square km.
Mexico has the largest population density at 61.986822 people per square km.
I don't know, I'm really confused with this Java program. I don't know how to do the main part of the program where the user inputs, array, and the output.
// Access the Scanner and ArrayList class by importing the java.util package.
import java.util.Scanner;
/** Project - A Country Object
* The purpose of this program is for the user to enter some information at most 10 countries. After the user has entered information about all the countries, the program should print out which countries in the list have the smallest and largest area and population density.
*/
public class Country
{
private String countryName;
private int theArea;
private int thePopulation;
public Country(String countryName, int thePopulation, int theArea)
[Code] ....
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Oct 29, 2014
I'm working on a method that would parse the value of the array of object that I passed through a parameter. I would like to ask if making Object as a parameter is doable. Let's say I have a class Student and Teacher. I created a class the would handle the sched and name it class Schedule and extend this class to the Student and Teacher. Now I want to have a function that will accept an array of Schedule from either Student and Teacher, what ever object I will pass in the parameter. I know its easy to just make a method with a separate parameter of my classes but im looking for a more dynamic code.
class Student extends Schedule{
//variables here for student
}
[code]
class Teacher extends Schedule{
//variables here for teacher
}
[/code]
private void parseObject(ArrayList<Object> objct){
Schedule temp = objct.get(0);
//there is no error in this part
}
Now when i will try to use the function and pass a data, it will not accept since my parameter should be an array of object. How would I twist dis one?
ArrayList<Student> temp_student = new Array....
parseObject(temp_student); // it will not accept my parameter, how would i make it as an object
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Feb 11, 2015
So I want to write a constructor that creates a new object with the data from the array values. I don't know where to start. It's the last method in the code:
public class Measurements {
private double[] values;
private double[] newArray;
private int n; //numberofvalues
private double[] ms;
public Measurements(int max) { //constructor
[code]....
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