I'm creating a 4x4 2D array. I need to be notified, or gain a value when all elements have been turned true. Is this as simple as
"If the2DArray[] = true { blah blah }" ?
If I have a boolean array that contains 30 elements (boolean[] fish), how do I go about isolating every 10 elements to use for something specific?
Say there are 30 types of fish stored within the boolean array and 0-9 are fish found specifically in the Indian Ocean, 10-19 are fish found specifically in the Atlantic, and 20-29 are fish specifically found in the Pacific Ocean. And for those 10 fish [0-9], [10-19], [20-29], each is a different color (red, orange, green, blue, white, black, silver, yellow, purple and gold), where the colors and locations of the fish are enum types Colors and Locations.
How do I go about appointing those characteristics to the fish?
Ex: elements [0-9] are fish from the Indian Ocean and [0] is red, [1] is orange, [2] is green, [3] is blue, [4] is white, [5] is black, [6] is silver, [7] is yellow, [8] is purple, and [9] is gold.
elements [10-19] are fish from the Atlantic Ocean and [10] is red, [11] is orange, [12] is green, [13] is blue, [14] is white, [15] is black, [16] is silver, [17] is yellow, [18] is purple, and [19] is gold.
elements [20-29] are fish from the Indian Ocean and [20] is red, [21] is orange, [22] is green, [23] is blue, [24] is white, [25] is black, [26] is silver, [27] is yellow, [28] is purple, and [29] is gold.
Will I need to appoint those characteristics in the constructor after initializing fish = new boolean[30]?
I have a piece of code for an applet that I want to run as the main applet code, and I want it to loop until a boolean is true, but it needs to paint while the code is looping. Here is the relevant part of my code ....
public void paint(Graphics g)
{
g.drawImage(background, 0, 0, this);
if(over == false)
{
tick();
[Code] ....
(I have tried replacing the if with a for, that does not work.)
I have the code and it works very well, but my professor wants us to use Junit testing to test our code. I've never used JUnit before, how it works. Is it possible to have a boolean value (true or false) randomly set?
Here is the code I need to test:
package musicalinstruments;
class MusicalInstrument {
public String name;
public boolean isPlaying;
public boolean isTuned;
public MusicalInstrument(){
isPlaying = false;
isTuned = false;
[Code]...
Write a static method odd() that takes three boolean inputs and returns true if an odd number of inputs are true, and false otherwise.
View Replies View Relatedimport java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class array
{
public static void main(String[] args)
[Code] ...
Is there a way to write this, where, alpha is one array.
Write a program that declares an array "alpha" of 50 elements of type "double". Initialize the array so that the first 25 elements are equal to the square of the index variable and the last 25 elements are equal to three times the index variable. Output the array so that 10 elements per line are printed.
If I have an array of 50 integers, can I break that to read in lines of 10?
I am trying to make a 2d array that keeps track of comparison counts. what I have so far works ok but writes over the previous elements with 0. can't seem to find where I am re-initializing the previous elements.
//this is one of my fill sort arrays
public void fillSelectionArray(int index, long countSum) {
//rand = new Random( );
//for ( int i = 0; i < listsize; i++) {
selectionList[ index -1] = countSum;
// }
[Code] ....
I know I am missing something just not sure what.
Assignment: Given an array of scores sorted in increasing order, return true if the array contains 3 adjacent scores that differ from each other by at most 2, such as with {3, 4, 5} or {3, 5, 5}.
scoresClump({3, 4, 5}) → true
scoresClump({3, 4, 6}) → false
scoresClump({1, 3, 5, 5}) → true
Codingbat AP-1 3rd question
public boolean scoresClump(int[] scores) {
for (int i = 0; i < scores.length; i++) {
int a = scores[i];
int b = scores[i + 1];
int c = scores[i + 2];
if (Math.abs(b-a) + Math.abs (c-b) <=2)
return true;
}
return false;
}
I got it right for some of the input, but not one of them. I tried to use the for loop and if statement on a specific input that I got wrong:
{4, 5, 8}
scores[1] - scores[0] = 1
scores[2] - scores[1] = 3
I suspect it has something to do with the for loop, but I don't see the problem with it. It should work, shouldn't it?
But anyway, here is the error for {4,5,8} :
Exception:java.lang.ArrayIndexOutOfBoundsException : 3 (line number:7)
Given an array of scores, return true if each score is equal or greater than the one before. The array will be length 2 or more.
scoresIncreasing({1, 3, 4}) → true
scoresIncreasing({1, 3, 2}) → false
scoresIncreasing({1, 1, 4}) → true
Java Code:
public boolean scoresIncreasing(int[] scores)
{
for (int i = 0; i< scores.length-1; i++) {
if (scores[i] < scores[i+1] || scores[i] == scores [i+1]) {
return true;
} else {
return false;
}
}
return false;
}
Unsure what the problem is, it will always return True for some reason...
I am taking the Class Algorithms and Datastructures and got an assignment for Lab that really throws me off. The goal is to create an Array out of a given CSV file, implement several Methods that get the size of array, etc.
I am still stuck in the first part where the CSV has to be imported into the Array. My problem is that I need a mechanism that figures out the needed size for the Array, creates the array, and only then transfers the data from the CSV.
The list consists of the following wifi related values:
MAC-Adress, SSID, Timestamp, Signalstrength.
These are on the list, separated by comma. The Columns are each of these, and the rows are the four types of values making up the information on a certain wifi network.
The catch is, we are not allowed to use any of the following:
java.util.ArrayList
java.util.Arrays
and any class out of java.util.Collection.
So far I used the BufferedReader to read in the file and tried to implement the array, but I get an arrayindexoutofboundsexception.
Below is my Code (Its still an active construction zone):
public class WhatsThere {
public WhatsThere(String wifiscan) throws IOException {
}
public static void main(String[] args) throws IOException {
// WhatsThere Liste = new WhatsThere(String wifiscan);
String[][] arrayListe = new String[0][0];
[Code] ....
I am new to Java and would like to ask how to do this question specifically:
Code a Java method that accepts a String array and a String. The method should return true if the string can be found as an element of the array and false otherwise. Test your method by calling it from the main method which supplies its two parameters (no user input required). Use an array initialiser list to initialise the array you pass. Test thoroughly.
When I insert: title, category, year, artist in 4 Strings And when I press "enter" i put those 4 in a array "large", and then when I can start a new music insert with 4 new string elements and add those in the large array..So: I have an array "large" with the length 19 (or so..)(max ~100 or so)Then I what to: get,in a new array "title",the elements:0,4,8,12,16 (from the large array) and put them in a scrollable list. And when I select one element in the title array I then whant to get 3 remaining elements from this. And put it in a array called selection.
So the "large" and the "title" arrays must be dynamically sizes... or be copied to a larger sized..
1 can it be done with arrays?
2 how do dynamically change the size of for example the array "title"?
3 how do I receive the elements 0,4,8,12,16 and so on, (to (
large.length-3) and add it to the title array?
I have a boolean array that looks like this
boolean seat[][] = new boolean[2][3];
I reserved one row for first class and another for economy class. This code works just as I want but my question is how can I loop through it so I don't need all the if statements? I tried it many ways. I tried something like this but I cant get it to work.
for (int row=0;row<seat.length;row++{
for (int col=0;col<seat[row].length;col++){
if (seat[0][col]==false){
seat[0][col]=true;
System.out.println("You have number 0" + row + in first class);
[Code] ......
How would you set a column in a JTable to make it unable to gain focus i.e. select the next column on the same row or ignore the command completely when selecting a column that should not be able to be gained focus on?
View Replies View RelatedI am trying to write a small program that will calculate the gain and/or loss of the sale of stock. The program will ask the user for the number of shares, the purchase price and the selling price. I am pretty sure that the errors is coming from my calculations in the program.
import java.util.Scanner;
public class investmentCalculator {
public static void main (String[] args) {
Scanner input = new Scanner(System.in);
//User input for number of shares
System.out.print("Enter the number of shares: ");
double shares = input.nextDouble();
[code]....
What is the sum of the array ar elements after executing the following code?
int[] ar = {1,2,3,4,5};
for (int i=0; i<ar.length-1; i++)
if (i%2==0) ar[i]=i;
My professor says the answer is 12 i dont know how he got that answer
I cant get this code to work if wont find the right min and range and its printing out my max three times . This is what I got
public static void main(String[] args)
{
double [] Rainfall = new double[12];
Rainfall[0] = 77.4;
Rainfall[1] = 56;
Rainfall[2] = 61.8;
Rainfall[3] = 62.1;
Rainfall[4] = 57.1;
[Code] ....
I have two arrays
private ReservedBook[] reservedBooks;
private LibrarySystem[] libraryBooks;
The library array has two books and I want to copy one of them to the reserved books when you type in the ISBN
public void borrowBook(String ISBN)
{
int i = 0;
if(numberOfBooks < MAX_BOOKS-1)
{
if(libraryBooks[i].getBookISBN().equals(ISBN))
{
for(i=0;i<MAX_BOOKS-1;i++)
reservedBooks[i] = libraryBooks[i];
}
else System.out.println("There is no such book");
}
else System.out.println("You have reached the maximum number of allowed books");
}
It shows me error: incompatible types - LibrarySystem cannot be converted into ReservedBook. How can I fix it?
So I am trying to create a code that searches if a word is square free. The user inputs a word (into an array) and then the code is suppose to see if it is square free. A word being square free means that the word doesn't contain any consecutive sub words. For example, "abcabc" is not a square free word because abc is repeated, but "abcdabc" is a square free word because there is a "d" separating the "abc".
So far I have this :
import java.util.Scanner;
public class A3Q2 {
public static void main(String[] args) {
// part (a) of the main
Scanner keyboard = new Scanner(System.in);
[Code] ....
I've been trying to experiment with different ways such as checking to see if there any duplicate elements such as,
public static char isSquareFree(char[] word){
for(char i = 1; i < word.length; i++) {
if(word[i] == word[i - 'a']) {
System.out.println("Duplicate: " + word[i]);
}
}
return word; }
}
And other methods but I'm just not getting it.
I have tried to print array elements using standard print statement. I am getting errors. How to print them. Here is my code:
class arrayEx1{
public static void main(String args[]) {
int a[]=new int[3]; //Declaring Single Diomentional Array
a[0]=10;
a[1]=20;
a[2]=30;
int total=a[0]+a[1]+a[2];
System.out.println("Values stored in a[0],a[1],a[2]elements are :" + a[0] a[1] a[2]);
System.out.println("Total values of a[0],a[1],a[2]elements is :"+ total);
}
}
if i give comma (,) in between above print stament (print statement 1) stil i am getting errors.
public class werek4d {
public static void main(String[] args) {
int counter = 1;
int[] anArray = new int[101] ;
for (int i = 0; i <= 99; i++){
anArray[i] = i + 1;
System.out.println(i + ": " + anArray[i] + " ");
[Code] ....
My aim is to generate a lists containing 1 to 100. I will then count the number of integers divisible by 3. After doing so, I want to delete the integers that are NOT divisible by 3 in the lists. I tried doing it, but I seem to keep on getting the same lists.
I am working on a assignment that has to do with array lists, it mainly has to do with adding new elements, telling then where it is it located, if the memory block is empty , ect. so far i have been having problems with my indexOf method which should display the array cell number that a input element E is in, and if it is not in there it should display a -1.
public class MyArrayList<E>
{
private E[] data_store = (E[])new Object[2];
private int sizeofa = 0;
private void resize()// makes the array list bigger if need {
E[] bigspacemaker = (E[])new Object[data_store.length * 2];
for(int x = 0 ; x< sizeofa ; x++)
[Code] ....
Error message:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 512
at MyArrayList.indexOf(MyArrayList.java:28)
at MyArrayListDemo1.main(MyArrayListDemo1.java:26)
This is my code for the driver class:
import java.util.*;
public class SavingsAccountDriver {
public static void main(String[] args) {
System.out.printf("%10s%10s%10s%10s%10s" , "Month" , "Account #" , "Balance" ,
"Account #" , "Balance");
[Code] .....
Here is the output I get :
Month Account # Balance Account # Balance
----- --------- ------- --------- -------
0 10002 2000.00 10003 3000.00
1 10002 2002.00 10003 0.00
2 10002 2004.00 10003 0.00
3 10002 2006.01 10003 3030.00
4 10002 2008.01 10003 0.00
5 10002 2010.02 10003 0.00
6 10002 2012.03 10003 3060.30
7 10002 2014.04 10003 0.00
8 10002 2016.06 10003 0.00
9 10002 2018.07 10003 3090.90
10 10002 2020.09 10003 0.00
11 10002 2022.11 10003 0.00
12 10002 2024.13 10003 3121.81
Why is it not showing those months updated balance? I feel like I'm pretty close. I guess I should specify that this is supposed to calculate monthly interest for one account and quarterly interest for the other. This is what the output should look like.
Month Account # Balance Account # Balance
----- --------- ------- --------- -------
0 10002 2000.00 10003 3000.00
1 10002 2002.00 10003 3000.00
2 10002 2004.00 10003 3000.00
3 10002 2006.00 10003 3030.00
4 10002 2008.01 10003 3030.00
... ... 12 ... ...
The quarterly interest is the one that is giving me trouble.
I have the simple table below:
currency amount
€ 2.0
$ 4.0
£ 5.0
How could I store the currency and amount in an array? A 2x2 array would do this but how to store them and retrieve them is the challenge. For example, I have a method that asks the user for two inputs, the currency and the amount and using the array as a chat table where I could map the currency to the the currency input entered by the user, I could do some calculations with the amount entered by the user. how I could represent the 2x2 array?
I was trying remove duplicates element from my array without using collection API but i didn't got any output from my code.Although it is compiled successfully but on execution it didn't give any output. I guess there must be some problem in function Duplicate
Java Code:
class Union {
public static void main(String...s) {
Union M=new Union();
int x[]=new int[]{1,0,1,4,10,10,10,3,567,4,3,33};
int y[]=new int[]{5,4,5,4,5,4,2,3,3,1,0};
int []w=M.merge(x,y);
[Code] .....
You are given an array A with elements 0 to n-1, numbers can be repeated in the array. Create n sets where
S[i]={a[i],a[a[i]],a[a[a[i]]]...}.
Set has all elements unique. Find the size of the largest set.
Input:
First line contains n, size of the array. n<1000
Next lines contains n numbers, each element of the array
Output :
Prints one number: Size of the largest set.
Sample Test Case:
Input: {3,1,2,0}
Output: 2
Explanation:
Four possible sets are
{3,0},{1},{2}{0,3}