Two Dimensional String Array - Accessing Variables

Feb 5, 2015

Suppose I have private static void name() { ... } that has a two dimensional string array named array[. Now suppose I have private static void different() {...} and I want to write a condition where if (item == array) { ... }, how can I access my array from name() when I am in different()? I get a compile error saying cannot find symbol. My code is similar to:

Java Code:

public static void main(String[] args) {
...
String item = keyboard.nextLine();
... }
private static void name() {
...
String[][] array = new String[1][5];

[Code] .....

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Accessing Variables From Array Instance Of Class?

Jan 26, 2015

I am having some problem accessing variables from an array instance of a class. Heres what i have done;

In the main class:

Example obj[]= new Example[4];

In the main class constructor:

obj[0] = new Example(0);
obj[1] = new Example(1);
obj[2] = new Example(2);
obj[3] = new Example(3);

In the main update() method:

if(condition)
//update

In the Example class constructor:

private boolean change = false;

In the Example class update() method:

if(x >20)
change= true;

Now, i want to access the variable change from the main class, how do i do it? The 'condition' in the if statement is the condition of wether the change variable ia true or false. How do i access it?

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Possible To Have Two Dimensional Array That Has A String And Int

Apr 8, 2014

Is it possible to have a two dimensional array that has a string and an int, so like combining these into a two dimensional instead of one:

String [] w = {"help", "me"}; and int [] n = {4,2};

obviously not what I'm really working on, but u should get the point.

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Comparing Two Dimensional String Array

Mar 7, 2014

I want to compere two element of string array by each other! eventually I want to print Yes or No in matrix . SO, I start reading data from file then split them into two parts .

File file= new File(fileName);
try {
inputStream = new Scanner(file);
while (inputStream.hasNext()){
String data= inputStream.next();
String [] token =data.split(",");
System.out.println("day"+token[0] +"embloyee name:"+ token[1]) ;
}
inputStream.close();

Now I want to compere each cell from token[0] by another array :

String[] day= { "Sunday", "Monday" ................};

if the days are equal then I want print yes in front of the employee name if not then i want to print No..is this gone work with me as I imagine it to be or do I have to take few more steps to get my code going?

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Two Dimensional Array - Converting Integers To String

Apr 10, 2015

I am pretty new to Java and am just learning about two dimensional arrays. I think that I understand the concept, but I seem to be having trouble adding stuff to my array. I wanted to make an array to hold both strings and integers, but wasn't sure if I could put integers in a string array. So I thought that I would be able to convert my integers to string and then add them. This however causes an error. This is my code(yes its probably not the best):

static String [][] students = new String [14][4];
static int number = 0;
String fName, lName, fullName;
int test1, test2, test3, test4;
String a, b, c, d;

[Code] .....

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Accessing Variables Within A Class?

May 19, 2013

I wanna know which is the best way to access a variables within a class ...

Using direct access or using the variable accessor ...

Example :

public class Numbers{
        private int n1;
        private int n2;
     public void setN1(int n){
     n1 = n;

[Code] ....

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Accessing Instance Variables And Methods

Oct 24, 2014

I have the following 2 classes:

class Address {
private int a;
public void set_a(int a) {
this.a = a;
}
}
class Person {
private Address address;
}

How do i access the method set_a() (through the "address" in Person) from another class which contains main() ?

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Accessing Vector Variables With Scanner?

Jan 26, 2015

When I input "the" or "and" I always receive "its not here" as the output. Why is this? I also tried printing the values of v.get(i).other and the system printed null twice.

public class Translator {
public String other;
public Translator(String x) {
x = other;

[Code].....

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Accessing Variables - What Is The Final Value Of Counter

Mar 7, 2015

While reading head first java i encountered a problem(Pg. 90 chapter 4 - mixed messages).

Suppose in a class(say A) outside main() a counter variable is declared and initialized to 0.

In main() declared the array of objects of the class A.

Consider a while loop in which we increment the counter as follows:

public class A{
int counter = 0;
public static void main(String[] args){
A[] arr = new A[20];
int x = 0;
while(x<4){
arr[x] = new A(); //arr[] is array object
arr[x].counter += 1;
x++;
}
}
};

what is the final value of counter ? will it be the same for all array objects.

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Sorting Array Of Objects Based On One Of Class String Variables

Apr 8, 2014

I have a school assignment that involves me sorting an array of objects based on one of the class String variables. I am using as the title says a simple selection sort method. The problem I'm having is that when I run the program in debug mode, it never seems to enter the if statement in the inner loop. I would like to say I've tried a number of things to figure it out, but honestly I'm just stumped as to why it's not working.

Here is the code:

public static void sortTransactions(Transaction[] oTransaction){// This is the sorting method, obviously it's not done so it currently just prints to screen.
System.out.println("Successful call to sortTransaction()");
String min = "";
int curInd = 0;
Transaction[] temp = new Transaction[1];

[Code] ....

The output when I check to see if the array is sorted verifies that the array never does get sorted.

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Release 1 Dimensional Array From 2 Dimensional Array

Mar 13, 2014

I have a 2x2 matrix and a 2 dimensional array.Let's say, my matrix is [a b] and array is [[1, 2], [3, 4], [5, 6],[23, 11]] .I need to multiply each 1 dimensional array in above array with the matrix.For instance,

[1, 2] multiply with [a b]
[3, 4] multiply with [a b]
[5, 6] multiply with [a b]
[23, 11] multiply with [a b]

So, each 1 dimensional array in there will be multiplied with matrix [a b] (same with matrix multiplication).how to do that multiplication in java. But I confuse how to 'release' each 1 dimensional array from the first array so I can do multiplication.How to do that in java?

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Finding Sum Of Two Dimensional Array

Apr 1, 2014

How to declare a 2 dimensional array of interger of size 10 by 10. and then set every element of the array to 3. After this I need to add up all the element in this array and return the value.

final int ROWS = 10;
final int COLS = 10;
int[][] foo = new int[ROWS][COLS];
for (int i = 0; i < ROWS; i++){
for(int j = 0; i< COLS; i++){
foo[i][j] = 3;
}
}

This is what i have done so far(not 100% if is correct..) but how to add up all the array.

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Two Dimensional Array Assignment

Jun 14, 2014

I am working on the following java assignment..Write a program that randomly fills in 0s and 1s into a 4- by- 4 matrix, prints the matrix, and finds the first row and column with the most 1s. Here is a sample run of the program:

0011
0011
1101
1010

The largest row index: 2
The largest column index: 2

I have code that generates random 0s and 1s for the array, how to get the largest column and row.

import java.util.Random;
public class LargestRowColumn {
public static void main(String[] args){
//create 4x4 array matrix
int arrayMatrix[][] = new int[4][4];

[code]....

finding the row and column with the largest amount of 1s. I keep thinking well if I scan and find a one in the array, maybe I can just save the index of the row and column and then determine which index contains the most 1's after the array has been scanned.

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Two Dimensional Array Of Integers

Nov 7, 2014

I am workinh with a couple of functions that deal with two dimensional (square) arrays of integers, doing things like checking equality, etc. For example, I know that I get an ArrayOutOfBoundsException in the isEqual function, but I don't know why.

public class MatrixUtils {
//This function checks if two matrices are equal
public static boolean isEqual(int A[][], int B[][]) {
for(int i=0; i<A.length; i++) {
for(int j=0; j<A.length; i++) {
if (A[i][j] != B[i][j]) return false;

[Code] ....

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Comparing In A Two Dimensional Array?

May 3, 2014

I have to make a program in which users inputs a number and the program should search into a two dimensional array and print out all the values that are below the number This is my first time experimenting with 2D Arrays and how to do this program I have the array set up

String firstarray[][]=
{{"", "Store101", "Store102", "Store103", "Store104"},
{"Tennis Shoes", "102", "54", "20", "78"},
{"Sweaters", "45", "25", "35", "75"},
{"Jeans", "12", "35", "45", "65"},
{"Shorts", "54", "25", "34", "45"},
{"Jackets", "15", "35", "50", "25"}
};

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Convert String To Two Dimensional Char And Output Is Equal To Matrix

Jan 6, 2014

I have written the code:

Java Code:

public static void main(String[]args)
{
Scanner input = new Scanner(System.in);
System.out.print("Type your text: ");
String text = input.nextLine();
int counter = text.length();
if(text.length()> 16)

[Code] ....

And input is: abcdefghijklm

output is:

Java Code:

a b c d
e f g h
i j k l
m x x x mh_sh_highlight_all('java');

So all i want is, if i type: abcdefghijklm

I want this output:

Java Code:

a e i m
b f j x
c g k x
d h l x mh_sh_highlight_all('java');

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3 By 3 Array And Storing It In 2 Dimensional Array

Apr 17, 2014

I am having trouble fixing and figuring out how to change my code. My out put is very off.

"
Enter a 3-by-3 matrix row by row:
1 1 1
1 1 1
1 1 1
Sum of the major diagonal is 6.0
Sum of the values of the column are: 10.0
Sum of the values of the column are: 20.0
Sum of the values of the column are: 30.0 "

Code is below:

public static void main(String[] args) {
double[][] m = new double[3][3];
m = createArray();
}
private static double[][] createArray() {

[Code] ....

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Accessing Indexes Of One Array And Add Them To Another Integer Array?

Aug 10, 2014

How can I access the index of one character array and store those indexes into another array? I need this array of indices so as to perform an addition with another array.

Suppose I have a char array that stores all the letters of the alphabet (say alpha) and I have an another char array (say letter) that contains some letters in it. I want to retrieve those letters from the "letter" array and check its index in the "alpha" array and store that index into another integer array.

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Declare Two Dimensional Array In Java?

Oct 28, 2014

I want to declare a 2 dimensional array in java which has 3 column and unlimited number of rows, i want to give a special name to each column . The type of first column is string second one is int and the last one is string

Column1_name
Column2_name
Column3_name
String value
Int value
String value
.
.
.
.
.
.

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Airline Two Dimensional Boolean Array

Feb 23, 2015

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] ......

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Return Location And Value To Two-dimensional Array

Jan 14, 2015

I need to design a class named Location for locating a maximal value and its location in a two-dimensional array. The class should contain public data fields row, column, and maxValue that store the maximal value and its indices in a two dimensional array with row and column as int type and maxValue as double type.

I need to write the following method that returns the location of the largest element in a two-dimensional array:
public static location locateLargest(double[][] a)

The return value is an instance of Location. Write a test program that prompts the user to enter a two-dimensional array and displays the location of the largest element in the array.

Here is what i get when I run

Enter the number of rows and columns of the array:
3 4
Enter the array: 23.5 35 2 10
4.5 3 45 3.5
35 44 5.5 9.6
The location of the largest element is at 00
The location of the largest element is at 01

But I need it to display this instead.

Enter the number of rows and columns of the array:
3 4
Enter the array: 23.5 35 2 10
4.5 3 45 3.5
35 44 5.5 9.6
The location of the largest element is 45 at (1,2)

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Number of rows and columns: ");
int row = input.nextInt();
int col = input.nextInt();

[Code] ....

Enter the number of rows and columns of the array:
3 4
Enter the array: 23.5 35 2 10
4.5 3 45 3.5
35 44 5.5 9.6
The location of the largest element is at 00
The location of the largest element is at 01

I need it to display this instead.

Enter the number of rows and columns of the array:
3 4
Enter the array: 23.5 35 2 10
4.5 3 45 3.5
35 44 5.5 9.6
The location of the largest element is 45 at (1,2)

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2 Dimensional Array Assignment With A Loop

May 5, 2015

I have a 2 dimensional array assignment with a loop, i'm supposed find the average score of each student from a grade record and find the average score for each test. I've been trying to do the assignment all day with no progress. This is what i have so far

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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Accessing String Values In Class

Apr 9, 2014

What does the line Console[] conList mean? How am I going to access the string values in class consolelist?

class ConsoleInfo

private String conTitle;
private double conPrice;
private int conQty;
private String conPic;
 
[Code] .....

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Incompatible Types (Parsing Two-Dimensional Array)

Mar 4, 2015

What the program must do is to parse the string-declared two-dimensional array for the program to compute the student's scores in their quizzes, but I'm having difficulty in anything with Parsing so I don't know what will be the appropriate codes.

Error: incompatible types: String[][] cannot be converted to int[][]

import java.io.*;
public class Quiz3{
public static void main(String[]args)throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String [][]StudQuiz = new String [5][4];

[Code] ....

How am I able to compute the average of the score if the data that is needed to be computed is in the string-declared array?

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Calculating Values And Passing From Two-dimensional Array

Jan 29, 2014

Long story short: The program takes user values (temperature) and converts them to the opposite (C >> F / F >> C)

I originally started this program with three separate arrays but then decided that it would be a good opportunity to use a two-dimensional array and one other.

The two-dimensional array has 2 rows, 10 columns. The second is a normal String array ...

Java Code:

String[][] myTemperatures = new String[2][9];
String inputAssembly[] = new String[9]; mh_sh_highlight_all('java');

I prompt the user for to enter temperature values, using a GUI and jbutton to distinguish F/C. Each time the user clicks 'continue', the values are stored into the two-dimensional array. One row holds the temperature, the other holds the C or F designation.

Java Code:

// CONTINUE BUTTON CLICK ACTIONS
class ContinueButtonListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
input = view.getTempValue();

[Code] ....

This is where I am experiencing the trouble and I cannot seem to get the Debug to work properly here. When the two-dimensional array is full OR the user clicks 'calculate' instead of 'continue', the Calculate event is performed via an ActionListener.

Java Code:

// CALCULATE BUTTON CLICK ACTIONS
class CalculateButtonListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String hold;
Double temp;

And I get a ton of errrors ...

Java Code:

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "[Ljava.lang.String;@7441b1fd"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)

[Code] ....

I imagine the issue lies within how I am handling the two-dimensional array in the CALCULATE event and/or converting the String[][] to String then parsing to an Integer.

Would this be better done is separate arrays (not using one two-dimensional, but storing 34C, 45F ... in one. I think this would be difficult for me to parse for conversions).

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Demonstrate Two Dimensional Array - Nested For Loops

Feb 4, 2015

Java Code:

// Demonstrate a two-dimensional array
class TwoDArray {
public static void main(String args[]) {
int twoD[] [] = new int[4] [5];
int i, j, k = 0;

[Code] .....

Output:

0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19

(1) I don't understand how repeating the loop creates the structure of the output. Taking the second loop away and putting the "System.out.print(twoD[i] [j] + " " );" under k++ creates the output to print a number on each line. How do I write the code not having the second loop, assigning k to each value that is moved through the grid then printing it out but having the output the same?

Java Code:

for(i=0; i<4; i++)
for(j=0; j<5; j++) {
twoD[i][j] = k;
k++;
System.out.print(twoD[i] [j] + " " );
System.out.println();
} mh_sh_highlight_all('java');

(2) I don't understand why you can't put a new line sandwiched between the first for loop

Java Code:

for(i=0; i<4; i++)
System.out.println();
for(j=0; j<5; j++) {
twoD[i][j] = k;
k++; mh_sh_highlight_all('java');
It compiles, but I get the message:

" Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at TwoDArray.main(TwoDArray.java:11) "

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