For Loop Involving Array

Jan 29, 2015

As a result I need to get 6 66 666 6666 66666, but I'm getting a mistake. Can anb explain what's wrong?

Java Code:

public static void main(String [] args)
{

int[] sixes = new int [6];
for (int i = 0; i < sixes.length; i++)
{
sixes[i] = i * 10 + 6;
System.out.print(sixes[i]);
}

} mh_sh_highlight_all('java');

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While Loop Involving Odd And Even Integers

Oct 9, 2014

My instructions are to:

1. Prompt the user to input two positive integers: firstNum and secondNum (firstNum must be smaller than secondNum).
2. Output all the even numbers between firstNum and secondNum inclusive.
3. Output the sum of all the even numbers between firstNum and secondNum inclusive.
4. Output all the odd numbers between firstNum and secondNum inclusive.
5. Output the sum of all the odd numbers between firstNum and secondNum inclusive.

*Use while loop
int firstNum, secondNum;
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter an integer: ");
firstNum = keyboard.nextInt();

[Code] ....

What to do with the while loop and how to find even and odd numbers.

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Program Involving For Loop And If Statement Not Working

Oct 23, 2014

Alright so I'm trying to write a code that implements a for loop and if statements that displays any number from 100-200 if the number is divisible by either 5 or 6 in rows of ten numbers each row. If it is not divisible by that number then it should go back to the beginning of the loop until it reaches 200. My main problem is that it doesn't display anything. I don't get any errors or anything but every time I run the program it just displays nothing. Sample output is at the bottom of the code.
 
public class Exercise5_11 {
public static void main(String[] args) {
int count = 0;
int i = 100; 
//for (the numbers from 100 to 200)
for (i = 100; i>100 && i<200; i++){
 
[Code] ....

/*Output
100 102 105 108 110 114 115 125 126 130
132 135 138 140 144 145 155 156 160 162
165 168 170 174 175 185 186 190 192 195
198 200
*/

It is still wip of course so I was trying to just get it to display int i but it doesn't do anything and I'm not really sure why.

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Involving Array Of Objects And Referencing Methods Of Each

Nov 26, 2014

I'm working on a project that involves the following:

-Creating a superclass of bankaccounts
-Creating two subclasses, checkingaccount and savingaccount
-Each of the two subclasses has different methods (writeCheck for checking, for example)
-Both types are created in a main class bank and stored in the same array

So let's say a user goes through the menus and creates a few savingAccounts and a few checkingAccounts (stored in the accounts[] array). Then, to write a check from one account, the user can enter the account number (a string), and the method will use a for loop to cycle through the array until it hits an account number match. Then it checks that it's the correct account type and calls methods from the subclass.

Problem here is that some methods work and some don't. In the following example:

for (BankAccount account: accounts) {
if (account.getAccountType().equals("Checking")) {
do {
if (account.getAccountNumber().equals(accountNumber)) {
amount = Double.parseDouble(JOptionPane.showInputDialog(

[Code] .....

The getAccountNumber method works but writeCheck is throwing an error. I tried creating a method in the superclass and overriding it in the subclasses but with no success.

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Jan 27, 2015

I am trying to print a loop inside an array of a greater size than the loop itself. Like for example I have an array of size 7 but it has only 3 elements.

int[] array=new int[7]
array[0]=2;
array[1]=3;
array[2]=4;

now what I want to do is print these three numbers in a loop so that my array[3]=2;array[4]=3;array[5]=4 ...... till the last one. Also the array could be any size and not just 7.

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Return Method Involving Arrays

Mar 2, 2015

public class School {
public final int MIN_GRADE = 0;
public final int MAX_GRADE = 100;
private int [] grades;
public School( int students ) {
grades = new int[students];

[Code] ....

The output is :

The numbers in the array are: 1 2 3 4 6 7 8 9 10 13 14 15
The highest grade is: 11

For some reason it is not giving me the highest number in my array. Did I write the method wrong ? Is my array even passing through HighestGrade ?

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Jan 31, 2014

I have created a text file that contains a small list of toy names and prices, like:

Barbie, 12.95
Lego, 15.99
Hot Wheels, 5.00
Power Rangers, 6.49

And what I would like is my application to read the contents of the file and store the toy names in a list component. And then I want to be able to select a toy name from the list and add it to a shopping cart that is a list component as well. I want to the application to have menu items and buttons to allow me to remove items from the shopping cart, clear the shopping cart of all selections, and check out.

When I check out, the application should calculate and display the subtotal of all the toy names in the shopping cart, the sales tax (which can just be 8 percent of the subtotal), and the total. create this simple application example I've just made up, and I'm going to add and use this example to create a bigger application myself.

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May 14, 2014

So I want the method getDisplayText of d to be returned as long as the for loop runs. When I do this I get a compile time error to enter a return statement. I am currently trying to fix it by returning an empty string, yet this doesn't seem the right way to go.

public static String displayMultiple(Displayable d, int count)
{
for(int i = 1; i <= count; i++)
return d.getDisplayText();
return "";
}

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Feb 1, 2014

I am learning Java on my own and I am taking on very small project by myself for fun, and I'm just stuck on this small part of the project.
So I have created a text file that contains a small list of toy names and prices, like:

Barbie, 12.95
Lego, 15.99
Hot Wheels, 5.00
Power Rangers, 6.49

And what I would like is my application to read the contents of the file and store the toy names in a list component. And then I want to be able to select a toy name from the list and add it to a shopping cart that is a list component as well. I want to the application to have menu items and buttons to allow me to remove items from the shopping cart, clear the shopping cart of all selections, and check out. When I check out, the application should calculate and display the subtotal of all the toy names in the shopping cart, the sales tax (which can just be 8 percent of the subtotal), and the total.

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Apr 4, 2014

1. Modify the following class so that the two instance variables are private, there is a constructor that accepts both the player's name and sport and there are get and a set methods for each instance variable:

public class Player {
String name;
String sport;
}

2. You can pass an instance of this class to the JLabel constructor if you want to display text in the label.Select one:
a. myLabel
b. myText
c. String
d. JTextField
e. JLabelText

how to start making this work?cause i am not familiar with the terms here and want to complete this program and I am new to java programming?

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Oct 25, 2014

I'm not sure if my understanding of PriorityQueues is correct, so I'm trying to check if my reasoning is valid. I'm supposed to compare the Big-O for arrays and linked lists for the following instructions:

Insert 100 objects having the priorities 1, 2, 3, ... , 99, 100
Big-O for Array: __________
Big-O for Linked List: ___________

Insert 100 objects having the priorities 100, 99, 98, ... , 2, 1
Big-O for Array: __________
Big-O for Linked List(Assume no tail reference): ___________

If my understanding is correct, priority queues take in items randomly with no particular order, but they are removed according to the priority of each element. If what I've said is true, wouldn't that mean that inserting any number of objects would be O(1) for both linked lists and arrays? If the PriorityQueue has no particular order, then wouldnt each add() simply insert something to the next array index/linked list node?

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Jan 25, 2014

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The Code

Main class:
import javax.swing.JFrame;
public class Alpha {
public static void main(String args[]){
log l = new log();
l.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
l.setSize(360, 240);
l.setVisible(true);

[Code] .....

The code originaly was written "eve.getSource() ==" but I changed that to see if it would resolve the issue with no avail. With it written this way, the program does nothing upon entering the text and pressing enter. Currently, there is nothing written to change the variable "val" to 1 to show that the username is valid. I did this because I can't figure out how I would go about doing this.

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Jun 16, 2014

I need to convert units accurately. Some of these units include angstroms (0.1nm) and astronomical units or light years. I can't seem to accurately perform these equations (probably mostly because of lack of a proper conversion formula). For example:

1 angstrom = 1.79985601 × 10^-14 leagues (or, 0.00000000000001799856 leagues).

To perform the conversion right now, I'm simply multiplying the angstroms by 0.00000000000001799856. However, inputting 55560000000000 (angstroms in one league) results in 0.9999999936. Why is this? Is it possible to work around it? I believe there's a term for the inability for a computer to process 1/3rd properly, but I can't remember what it's called - is that the problem?

I am using BigDecimals for all equations.

Edit: a mod can change the title if they think another is more fitting.

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Apr 15, 2015

How can I display this result.aJohny

I have array contain numberi create new char array and i want to check if a number is >= 90 in array then input A at the same index in char arraythen second part i want to check if char array contain "A" then a = a + 1. 

The result is like this:

A: 5
B: 29
C: 38
D: 24
E: 12
F: 17
 
public class Test {
public static char[] grades(int[] getMarks) {
                        char[] grade = new char[getMarks.length];
                        for (int i = 0; i < getMarks.length; i++) {
                                    if (getMarks[i] >= 90) {

[Code] .....

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Mar 30, 2015

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The problem is that my sorting code can't get access to full array in loop.

Is there any way to pass array to sorting code, or somehow change sorting code?

package pkg06;
public class Main {
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[code]...

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Apr 20, 2014

I need a phonebook that allows the user to input up to 100 numbers but stop when they want to. I have the code for the array and input and output. I thought I had the do...while loop correct for asking the user if they want to input another name but its not working, even when you input "N" it still keeps going. Here's my code.

import java.util.Scanner;
import java.util.ArrayList;
public class PhoneEntry2 {
int x;
char repeat;
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[Code] ......

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Dec 5, 2014

I want to print each value in the multi-dimensional array using a for loop but there is a problem.

Here is the script:

Java Code:

public class LearningJava
{
public static void main(String[] args) {
int[][] Grid = {
{12, 24, 36, 48, 60},
{1, 3, 5},
[Code] ....

Printing i: 0, x: 12
Printing i: 0, x: 24

Exception in thread "main" Printing i: 0, x: 36

Printing i: 0, x: 48
Printing i: 0, x: 60

java.lang.ArrayIndexOutOfBoundsException: 5
at LearningJava.main(LearningJava.java:11)

It's suppose to get the length of each array and print all the values in that array and then move to the next one.

I tried adding .length

Java Code: for(int x = 0; x < Grid[i][x].length; x++) mh_sh_highlight_all('java');

but then it doesn't work at all.

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public class SiuTest {
public static void main(String[] args) {
String [] stu= new String [5];
int [] [] grade= new int [4][2];
String hold;

[code]....

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Mar 13, 2014

I have to take user input and then count how many times each number that the user input and print each one out. For some reason, I can't even get the for loop statement to print and it's pretty much the same as my other program except for the loop which is a little different.

//User inputs numbers between 1 and 100, program counts how many of each integer is and ends with a 0
 
import java.util.Scanner;
 public class occurrence {
 public static void main(String[] args) {
 //scanner/values
Scanner input = new Scanner(System.in);
int number = 0;
int c = 0; //array count
 
[Code] ....

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Jan 29, 2014

int[] a = new int[7];
a[0] = 0;
a[1] = 10;
a[2] = 256;
a[3] = 57;
a[4] = 33;
a[5] = -154;
a[6] = 168;

[code]....

What program needs to find is the most biggest number. It does the job, but another task of the program is to find the index of that number . The second loop should do just that, but for some reason, as the loop goes further, it passes through the if statement even though answer "a[i]" is not equal to "answer". The idea is that if a[i] and answer are equal, the "i" should represent the index number.

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Apr 3, 2014

The main method should creates a Student object with name as "Bill" and marks as {88,92,76,81,83} and print it.

Java Code:

class TestStudent {
public static void main(String args[]) {
Student1 st = new Student1();
st.name = "bill";
Student st1[] = new Student[6];
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Oct 4, 2014

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void markItemOnLoan(String title, String name, String date){
int i=0;
for (i = 0; i < numberOfItems; i++){
if (items[i].getTitle().equals(title)){
items[i].markOnLoan(name,date);
}
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Jul 12, 2014

I have written following code.

I want to print all elements in Array to output here is my code

int[][] arr={{12,12,13},
{14,1223,14}};
for(int i=0;i<arr.length;i++)
{
for(int j=0;j<arr.length;j++)
{
System.out.println(arr[i][j]);
}
}

but I am getting following output

12
12
14
1223

how to print all elements of int array?

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Feb 5, 2014

I am trying to find 3 largest numbers in an array using a single For loop but my following code is still showing randomly sorted numbers.

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static int array[] = new int[100];
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
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Oct 26, 2014

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public class P2F {
public static void main (String[] args) {
double [] player= new double [9];
//player[0]= Math.random();
for (int index=0; index < player.length; index++) {

[Code] ....

When I open the terminal window I get different variations of this [D@4545c5]. I would like to know all the things I am doing wrong.

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Apr 16, 2014

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import java.util.Scanner;
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public static void main(String[] args) {
Scanner input = new Scanner(System.in);
double exampleArray[] = new double[5];
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