Java Array Throws Exception For Multiple Values
Jan 3, 2014
int nRows = 0;
for (EITest testCurr : testList) {
testCaseListArray[nRows] = new Object[3];
String testName = testCurr.getTestName();
LOG.info("testName=" + testName);
testCaseListArray[nRows][0] = testName;
[Code] ....
This throws null pointer exception because of array initialization error. I tried this:
int nRows=0;
for(EITest testCurr: testList){
testCaseListArray[nRows] = new Object[3];
String testName = testCurr.getTestName();
LOG.info("testName=" + testName);
testCaseListArray[nRows][0] = testName;
[Code] ....
But this is not complete solution.
2) I want to make this as a collection object such as array list instead of Array declaration.
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Jan 24, 2014
I was giving a quick skim to some tutorials on the internet where I have found the exception that is handled is also declared in the throws clause of the method wrapping the try-catch block. For a code representation consider the following:
public void methodName() throws IOException {
try {
...
} catch (IOException ex) {
.... TODO handle exception
}
}
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Aug 15, 2014
I have a file greenGrow.txt, and every three lines of the file has a last name, first name, and yard size. Every time a Customer object is created, I need to read the file 3 lines and assign the object a last name, first name, and yard size.
Snippet of my code:
import java.io.*;
import java.util.*;
public class Customer {
private String lastName;
private String firstName;
private int yardSize;
[Code] .....
My issue is that I cannot call readFile() from the constructor, and I'm assuming that's because I throw Exception on readFile(). Is this a simple fix, or am I looking at it the wrong way?
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Jun 19, 2014
I know I can calculate the sum of squares as such:
// SumSquares.java: calculate the sum of two squares
class SumSquares {
static int sumSquares(int a, int B)/>/> {
int asquare;
int bsquare;
[Code] .....
But how can I modify the code so that it inputs a list of integer values in the range of -100 to 100 from the keyboard and computes the sum of the squares input values. And how would I go about using exception handling to ensure that the input values are in range and are legal integers.
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Oct 16, 2014
I have the following structure and want to use lambda expressions with it, but an exception occurs:
class SuperClass // (package private)
public class SubClass extends SuperClass // in same package as SuperClass
I have a functional interface (a listener), which has one argument of type SubClass.
public interface MyListener() {
void myMethod(SubClass e);
}
When I use the old-school Java 7 style:
addListener(new MyListener() {
@Override
public void myMethod(SubClass e) {
System.out.println(e);
}
});
Everything works fine! If I use Java 8 lambda expression instead:
addListener(e -> {
System.out.println(e);
});
It will throw an exception:
java.lang.IllegalAccessError: tried to access class SuperClass
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Feb 27, 2015
I have a question in mind that this is my registration form. I am sending these values from HTML form to server and database. I have question that in my case if I click next to Add Another Mobile no in HTML.then a block is genereated and each time a new name is generated.
My Question is if I click 6 times then 6 name attribute are generated. How can I send and differentiate them on my server side.
Because at their I will use something request.getAttribute("Attr_Name");
But they are same. How to do this?.
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Dec 15, 2014
Create a java application that contains an array of 10 multiple-choice questions related to you favorite hobby. each question contains three answer choices. also create a parallel array that holds the correct answer to each question - A,B, or C. display each question and verify that the users enters only A,B, or C as the answere - if not, keep prompting the user until a valid response in entered. If the user responds to a question correctly, display "Correct!"; otherwise, display the correct answer is and the letter to the correct answer. After the user answer all the question, display the number of correct and incorrect answers.
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Oct 26, 2014
java 7 feature (Multicatch and final rethrow ).. how to print user defined message in catch block with respect to multiple exceptions in single catch block...
Ex:
}catch (IOException | SQLException ex) {
System.out.println("Exception thrown");
/**
* i want like this, if IOException is thrown then System.out.println("File not Found");
* if SQLException is thrown then System.out.println("DataBase Error");
*/
}
how to do this without using if-else block?
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Mar 27, 2014
I want to return multiple values in my EJB query. The query goes something like this:
SELECT SUM(s.sales) SUM(s.cancels) FROM accounts.
To implement this if I write as below:
Query query = _em.createNamedQuery("Accounts.findAccountData");
Now if I do query.getSingleResult(); how do i retrieve both the values since the ejb finder returns either a single object or a collection?.
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May 20, 2014
Write a complete Student class that allows you to use the statements such as the following in methods in outside classes, with the obvious meanings. Then write an application program that creates one student object, reads in test grades until a negative "grade" is seen (as a signal that the list of grades has ended), then prints out all available information about the Student:
Student bob = new Student ("Robert", "Newhart");
bob.storeGrade (23); // bob scored 23 on this test
return bob.getTotalGrades();; // total of test scores to date
return bob.getAverageGrade();; // for all test scores to date
return bob.getName();; // returns "Robert Newhart"
What I need is in the Student class... I'm not sure how to go about storing the grades without renewing the value of storeGrade (I'm sure what I have right now is incorrect, but I'm stuck). This is what I have so far, as you can see I left some of the grade-related bits blank for now, but all I want to know is how I can store the grades:
Java Code:
public class Student extends Object
{
private int itsTotalGrades;
private int itsAverageGrades;
private String itsFirstName;
private String itsLastName;
private int storeGrade;
public Student (String first, String last)
[Code] ....
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Sep 13, 2014
//compiler error I'm receiving
J:CS3Student Folder Review Lab #2APlusImage.java:41: error: cannot find symbol
xcor.add(read.nexInt());
[Code].....
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Apr 25, 2014
Can I assign multiple values to one variable? For example I want myNum = 0 thru 9 you see im trying to program a password checker program to verify that the password meets all the criteria 8 char long, 1 upper case, 1 lower case, 1 numeric, 1 special, and don't contain and or end
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Feb 20, 2014
The below program ask the user to enter the value of x 1 , Y 1 and radius in separate boxes , What would look nice is if the user can Enter the Value X ,Y and radius in the same box.
import javax.swing.JOptionPane;
public class C3E29GeometryTwoCircles {
public static void main(String[] args) {
// Ask the user to enter the x1 coordinate.
String strNumber = JOptionPane.showInputDialog("Enter the value of x1 coordinate " );
double x1 = Double.parseDouble(strNumber);
strNumber = JOptionPane.showInputDialog("Enter the value of y1 coordinate " );
double y1 = Double.parseDouble(strNumber);
[code]...
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Dec 13, 2014
Here is my HashMap and a method for listing all the keys in it
HashMap<String, String> exampleOne = new HashMap<String, String>();
public void allKeys() {
int i;
i =0;
for (String name: exampleOne.keySet())
[Code]....
Now I want to return all values that associated with one key. How do I do this? Or is it possible to other way round? I mean return All keys associated with a value?
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Jun 18, 2014
I am making use of NetBeans IDE 8.0 to build a GUI. The idea is that I set multiple values received from textfields to textarea. This will enable me print the work. But ONLY ONE value from textfields is set(appear on textarea); the others do not appear at all. Below is example of what I mean:
String s = jTextField1.getText();
JTextArea1.setText(s);
String x =
jTextField2.getText();
JTextArea1.setText(x);
Only one is being set. The rest are not.
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Sep 23, 2014
class MultipleReturn {
int getInt() {
int returnVal = 10;
try {
String[] students = {"Harry", "Paul"};
//System.out.println(students[5]); //if i remove comment
[Code] .....
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May 12, 2014
As I am new in java, JSP and DATABASE...
<form action="Insert_Values_Servlet" method="post">
<label><strong>Title</strong></label>
<input type="text" name="Title" placeholder="max 50 characters"/><br>
<label><strong>Profession</strong></label>
<input type="text" name="Profession" placeholder="Ex.Manager"/> <br>
<input type="checkbox" value="LifeStyle" id="slideOne" name="check" />
<label for="slideOne">LifeStyle</label><br />
[Code]...
This is my insert.jsp page I want to insert multiple values into database Including multiple values of checkbox, other values are getting inserted but only problem at selecting multiple checkbox values in same column and radio button value in same column.
---------------------look for servlet page below----------------
Connection con = null;
ResultSet rs = null;
PreparedStatement pst = null;
int user = 0;
String User_Id1 = null;
String Other_Services = "";
String Title = request.getParameter("Title");
[Code]...
Is there any solution to insert this...By mistake in query I have followed with extra questionmark in following line This is correctline for inserting 5 values in database
String insertinfo = "INSERT into offer_data (Title,Profession, Other_Services ,Area, City) values(?,?,?,?,?)";
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Jun 29, 2014
When I try to run the programm, it always throws a FileNotFoundException, algthough the file exists in the same folder as the project. I tested it with the canRead() method and it returned false, but I can't figure out why it can't read from the file
package sumOfFloats;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class SumOfFloats {
[code]...
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Oct 13, 2014
I am receiving an ArrayIndexOutOfBoundsException for the following code, which moves a creature through a 2D array maze. I have altered the clauses of the first if statement for the four direct methods (north, south, east, and west) multiple times (i.e. x + 1 >= 0 && x > 0 && x - 1 > 0 && x < array.length...etc). However, while the code occasionally runs, more often than that it returns this exception. Catching the exception seems like a poor workaround though if worst comes to worst I'll do that.
I included only the relevant functions of the code:
public boolean goNorth(char[][] array) {
boolean success = true;;
x = getX();
//x = this.x;
y = getY();
//y = this.y;
if ((x - 1 >= 0 && x - 1 < array.length)
&& (y >= 0 && y < array[x].length)) {
[Code] .....
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Feb 11, 2015
I created a class Person:
Java Code:
public class Person {
protected static int MAX_AGE = 150;
protected static int MIN_AGE = 0;
private static final String VALID_WORD_REGEXP = "[a-zA-Z]{3,30}";
private String firstName;
private String lastName;
[Code] ....
I'm trying to learn right way how to throw exceptions. I
Besides that I have couple questions:
I can't quite understand throws statement. I'm thinking throws statement is for passing exceptions one level higher(with are not cought in this caller function). So that would mean I need to put throws in this function only:
Java Code: Person(String firstName, String lastName, int age) mh_sh_highlight_all('java');
Am I right or wrong and is there any other use for it? If so that would mean when
Java Code: Person person = new Person(.....) mh_sh_highlight_all('java');
must be in try tags. How can I avoid it?
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Feb 9, 2015
I am trying to create an array list without using the built in arrayList class that java has. I need to start the array being empty with a length of 5. I then add objects to the array. I want to check if the array is full and if not add a value to the next empty space. Once the array is full I then need to create a second array that starts empty and with the length of the first array + 1.
The contents of the first array are then copied into the new array without using the built in copy classes java has and then the new array ends up containing 5 elements and one null space the first time round. The first array is then overwritten with the new array containing the 5 elements and the null space. The process then starts again adding values until the array is full which will be 1 more value then recreating the second array empty and the length of the first array + 1. This is my attempt at creating this but I have run into multiple problems where I get only the last value I added and the rest of the values are null:
public class MyArrayList {
public Object arrayList[];
public MyArrayList(Object[] arrayList) {
this.arrayList = arrayList;
[code]...
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Jun 15, 2014
Write a method that returns a new array by eliminating the duplicate values in the array using the following method header: public static int[] eliminateDuplicates(int[] list). The thing is that I found the working solution that is written below, but how it works. How to eliminateDuplicates method done with flag and flag2.
Here is the code:
Java Code:
import java.util.Scanner;
public class Exercise06_15 {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
int[] numbers = new int[10];
System.out.println("Enter ten numbers: ");
[code]....
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Feb 16, 2015
filling out a Random array: An Array of Specific Length Filled with Random Numbers This time what I need to do is take the elements from this Random array and assign them to a new Byte array:
for(int i = 0; i < limit-10; i++) {
Random dice = new Random();
int randomIndex = dice.nextInt(array.length);
if (array[randomIndex] < 128) {
System.out.print(array[randomIndex] + " ");
} else if (array[randomIndex] >= 128) {
System.out.print(array[i] + " ");
}
}
byte[] noteValues = new byte[]
{ 64, 69, 72, 71, 64, 71, 74, 72, 76, 68, 76 }; //This is the byte array filled manually!
I've tried amending the manual input to fit in with the Random array, as follows:
byte[] noteValues = new byte[]
{ array[randomIndex] };
In this case, however, the Byte array can't interpret the int values. Also, if the Byte array is outside the 'for' loop, array[randomIndex] cannot be resolved.
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Mar 3, 2014
I'm trying to insert numbers in a array of Integer neatly. When i try to insert the following numbers i have this exception.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at time.Historico.insere_ordenado(Historico.java:35)
Line 35 in my code is:
"while (num >= arry[i] && arry[i] != null && i < arry.length - 1)"
Numbers:
71516357248031
I have this exception when i try to instert 80.
public Integer[] insert_neatly(Integer[] arry, Integer num)
{
Integer i, acum, aux, temp;
i = acum = 0;
if (arry[i] == null)
[Code] ....
What is wrong with this code?
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Feb 18, 2009
I am getting Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4 at lsb2.main(lsb2.java:44)Here is the code:
Java Code: import java.io.*;
import java.lang.Integer.*;
import java.lang.Math.*;
import java.util.*;
class lsb2
[code]....
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Jan 28, 2014
java.lang.ArrayIndexOutOfBoundsException: 991
at Champion.main(Champions (1) (1).java:209)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
[Code]....
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