Iterative Statements / Writing To Files / Nested Loops

Dec 2, 2014

So basically i have to read from a text file and get some information back from that and print to screen. Im quite confused and im not sure what loop i should use first to scan the text and receive certain information back?

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Factorial - Writing Iterative Program Recursively

Apr 30, 2015

It was quite recently that Data Structures was introduced to me, so I started out writing some iterative programs recursively.I found some strange output which shouldn't have come out but if you take a look at these three codes

long factorial(long n)
{
if(n == 1)
{
return 1;
}
else
{
result = n*factorial(n-1);

[Code] ....

These are three versions of the code, achieving the same objective of obtaining a given number and returning the factorial, but in spite of the changes made to the code, they produce the same result. I needed a reason as to why it is so? I tried to dry run all the codes but at some point or the other I got confused, and had to start all over again and couldn't come up with a proper result.

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Nested If Statements

Sep 11, 2014

I am in the process of creating a calculator GUI that calculates different answers based on inputs two main comboboxes and numbers in the appropriate textfields. The first one allows the user to choose from 18 different materials, while the second has the user choose between two different shapes. In a brief word explanation, here's how it's set up:

User chooses material.
User chooses shape.
User types in appropriate values.
'Calculate' button clicked.
If shape = rectangle, execute rectangle calculation.
Else if shape = cylinder, execute cylinder calculation.

Everything works just fine with zero errors on all 18 materials and all kinds of decimal numbers when the second shape is selected. So the math and layout is solid. However, when the first shape is selected, it returns a $0.00 answer regardless of the input values (still no red-line errors). In efforts to troubleshoot, when I have /* Cylinder section */, the rectangle section works to a 'T'. This, I believe is caused by poor formatting in the syntax of the 'if' 'else if' in regards to the shape combobox.

//If 'Rectangle' is selected:
if(shapeDropDown.getSelectedIndex()==1) {
//6061
if(materialDropDown.getSelectedIndex()==0) {
String msg0 = "The price is: $"
+ currencyFormat.format((0.098*(number2*number3*number4)*3.06));
totalPrice.setText(msg0);

[code]....

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While Loops Within If Else Statements?

Dec 19, 2014

What I'm trying to do below is to say if (adultTickets > 0) I want to bypass the studentOAP tickets question and go straight to the question about dinner. But if (adultTickets ==0) I want to go to the studentOAP question and then if the (studentOAPTickets >0) to go to the question about dinner. But if the (studentOAPTickets ==0) I want to go straight to the question about the contact number.

System.out.print("How many adult tickets do you require? ");
int adultTickets = 0;
boolean validAdultValue = false;
while (validAdultValue == false) {
if(aScanner.hasNextInt())

[Code] ....

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Correct Units And Nested If Statements

Feb 19, 2015

How I am supposed to set up the units for my program, and how to correctly display them in the console. Here is a description of my program.

To display the nonzero denominations only, using singular words for single units such as 1 dollar and 1 penny, and plural words for more than one unit such as 2 dollars and 3 pennies. You must use nested if statement when displaying the output.

Sample run:
Enter an amount in double, for example 11.56: 1.56
Your amount 1.56 consists of
1 dollar
2 quarters
1 nickel
1 penny

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For Loops Inside Of Switch Statements

Mar 30, 2014

This is what I'm trying to do;

Java Code:

import java.util.Scanner;
class test{
public static void main ( String[] args ) {
Scanner scan = new Scanner ( System.in );
int choice = scan.nextInt();

[Code] ....

How is this doable?

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How To Traverse ResultSet Object Using Nested While Statements

Dec 24, 2014

I have a my result set object which has data as shown by the attached image.What i am trying to do is traverse these results and do certain operations. I want my program to do this, if I

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Calculating Commission With Loops / If Else Statements And JOptionPane

Mar 8, 2015

SalesMan receives 200$ a week plus 9% of commission on the items he had sold that week

item 1 = 5.00
item 2 = 10.00
item 3 = 1.00
item 4 = 25.00

My code : (((I honestly dont know how to loop it... it must ask "What item did you purchase, and have the user input the number of item they purchased THAN looped back to ask again what item did they purchase untill they hit -1 to exit the loop))

import javax.swing.JOptionPane;
public class ControlStructure{
public static void main(String [] args){
double item1 = 5.00;//item 1 price
int quan1 = 0;
double total1 = 0;

[Code] .....

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Nested For Loops

May 15, 2014

how a nested for loop increments the outer loop and then the inner loop and then when it runs the inside code.I've ran the program a few times but I'm just not understanding it, need little narrative to it?

for(int i=0; i < 5; i++){
System.out.println("i - " + i);
for(int j=0; j < i; j++){
System.out.println("j - " + j);
count++;
}
}

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Nested Patterns Using For Loops

Feb 9, 2015

i want to use nested loops to print patterns but i cant seem to make a pattern that will look like V and K this should be the outcome.

* *
* *
* *
* *
*

@ @
@ @
@@
@ @
@ @

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Nested Loops Or Set Operations?

Oct 10, 2013

Is there any advantage to using Java's operations defined in sets or collections over inspecting in nested for-loops?

For example, suppose I want to keep items from one array that do not appear in another, I could do:

for( PrimitiveType prim_1 : someArray ){
for( PrimitiveType prim_2 : otherArray ){
if( prim_1 != prim_2){
///put in some return list
}
}
}

Or else I could do:

ArrayList<NotPrimitive> excludedElements =
new ArrayList(Arrays.asList(primitiveArrayToExclude));
for( PrimitiveType elem : someArray){
if( ! excludedElements.contains( elem ) {
//put in some return list
}
}

I personally see no improvement in legibility nor any reduction of error potential.....

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Displaying Pattern - Nested For Loops

Jan 24, 2015

Write a program that will display the following pattern.

$$$$$$$$$$
$$$$$$$$$
$$$$$$$$
$$$$$$$
$$$$$$
$$$$$
$$$$
$$$
$$
$

I need to write a program that uses nested for loops to display that patter but I have no clue on how to do it....

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Line Spacing - Nested For Loops

Sep 21, 2014

I am having a problem understanding line spacing. I need to write a program that has nested FOR LOOPS to produce the following output:

1
2
3
4
5

I can get a for loop that counts down. The problem I have is using for loop for line spacing. How a for loop for a line works.

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Nested FOR Loops For Rows And Columns

Apr 21, 2014

I need to write a class,that will give me output like this:

*
***
****
***
*

I have to use for loop,i know that i have to use nested for loops, for rows and columns. I just cant figure it out the thing with spaces,and how to turn it to count back.

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Create A Checkerboard Pattern With 2 Nested For Loops?

Feb 12, 2015

Im trying to create a checkerboard pattern with 2 nested for loops . I need to output asterisk characters. Im supposed o use an n int so I dont know if im limited to that 1 int. Im only getting 1 line of asterisk.

* * * * *
* * * * *
* * * * *
* * * * *
package checkerboard;
public class Checkerboard {
public static void main(String[] args) {
for (int row = 1; row < 6; row++){
System.out.print("* ");
for (int col = 6; col < col; col++) {

[code]...

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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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Nested For Loops - Determine If Inputted Integer Is Even Or Odd

Sep 29, 2014

So I cant figure out why my output for my for loop isn't working properly. So the output for the square comes out right but the for loop isn't working properly for the H. I have tried to figure it out and it should go to the next line but its not.

import java.util.Scanner;
public class Random
{
public static void main(String [ ] args)
{

[Code] ....

Output

Enter a positive odd integer: 5

Square:
*****
* *
* *
* *
*****

H:
* *

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Using Nested Loops In A Class Called Print Patterns

Mar 7, 2014

Write a method to print each of the following patterns using nested loops in a class called PrintPatterns. The signature of the methods are:

public static void printPatternX(int size) //'X' from 'A' to....., size is a positive integer.

#
##
###
####
#####
######
#######
########

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How To Use Nested Loops To Print Out A Letter Pattern Wraps From Z

Jan 6, 2015

//method class
import static java.lang.System.*;
public class TriangleFive
{
private char letter;
private int amount;
public TriangleFive()
{

[Code]...

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Making Patterns (Diamond Shape) Using Nested Loops

Mar 23, 2015

I have to make a pattern that is of a diamond shape such as this:

Java Code:
1
1 2 3
1 2 3 4 5
1 2 3
1
mh_sh_highlight_all('java');

I wrote this (for the variable name, this is just a small part of my program and I'm trying to get the pattern right so I didn't mind my variables at the moment):

Java Code:

public class NewFile{
public static void main(String []args){
int k = 0;
for (int i=1 ; i<=5 ; i++) {
{ for (int h=2 ; h >= i ; h--)

[Code] ....

My output is the following:

Java Code:
1
123
12345
1234567
123456789
mh_sh_highlight_all('java');

I realize I should divide the code into a lower and upper triangle using two loops. However, I don't know how to break the first part. I did find the "trend" but I don't see how to implement it.

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Nested For Loops And Strings - Take A String As Parameter And Store It In S

Oct 11, 2014

Question: 1. Declare and implement a class named Substrings. The class will contain the following data members and methods:

Data members:
string S

Methods:
setS() take a string as a parameter and store it in S
printSub1(), printSub2(), printSub3(), printSub4() print all substrings of S. If S = "abcd",

printSub1() will print "a", "ab", "abc", "abcd", "b", "bc", "bcd", "c", "cd", "d",
printSub2() will print "abcd", "bcd", "cd", "d", "abc", "bc", "c", "ab", "b", "a",
printSub3() will print "a", "b", "c", "d", "ab", "bc", "cd", "abc", "bcd", "abcd", and
printSub4() will print "abcd", "abc", "bcd", "ab", "bc", "cd", "a", "b", "c", "d".

Alright so after doing some googling and watching tutorials I managed to put together the first two but I still don't exactly understand how nested for loops work, however just a single loop I do understand.

Secondly, the 3rd and 4th prints are completely destroying my brain using for loops, which we are supposed to use. Check out my code below, also keep in mind the 3rd is giving errors and the 4th i had to revert back to the same as the first print temporarily because my code because so messed up. How to understand nested for loops better.

[code=Java]

import java.util.Scanner;
class subString {
String S;
void setSubstring(String SS) {
S = SS;

[Code] .....

Compiling: error for myS.printSub3 and myS.printSub4 is the same as 1 because i had to revert it after ruining the code.

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Nested For Loops - Check If There Is A Duplicate Element In The Array

Aug 4, 2014

Nested for-loops always throw me in a loop.I found a snippet that uses 2 for-loops to check if there is a duplicate element in the array:

/*
* brute force way of checking if array contains duplicates in Java comparing each elements to all other elements of array complexity on order of O(n^2) not advised in production
*/
public static boolean bruteforce(String[] input) {
for (int i = 0; i < input.length; i++) {
for (int j = 0; j < input.length; j++) {
if (input[i].equals(input[j]) && i != j) {
return true;
}
}
}
return false;
}

Let us say we have:
String[] input = new String[] {"one","two","three","one"}

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Print ASCII Image Using Nested For Loops - Reverse Iteration?

Oct 6, 2014

I'm writing a program to print an ASCII image using nested for loops. The output is a rocket ship that looks like this.

/**
//**
///**
////**\
/////**\
+=*=*=*=*=*=*+
|../..../..|
|.//..//.|
|//////|
|//////|
|.//..//.|
|../..../..|
+=*=*=*=*=*=*+
|//////|
|.//..//.|
|../..../..|
|../..../..|
|.//..//.|
|//////|
+=*=*=*=*=*=*+
/**
//**
///**
////**\
/////**\

I'm having problems with the mid section of the rocket, specifically the bottom part of the mid section:

|../..../..|
|.//..//.|
|//////|

I'm having difficulty writing the for loop to correctly print the dots. You're supposed to incorporate a constant which allows you to adjust the size of the overall figure. The loop doesn't work when I adjust the size, only when the value of HEIGHT is 3. The loop, however, for some reason works with the top part of the mid section.

This is the for loop for the top section.

for (int dots = 1; dots <= -1 * line + 1 * HEIGHT; dots++) {
System.out.print(".");
}

This is the for loop for the bottom section.

for (int dots = -1 * line + 1 * HEIGHT; dots <= 1; dots++) {
System.out.print(".");
}

Usually reversing the iteration of the loop just requires flipping the conditions, right? But it didn't work this time for some reason. Why this doesn't work? I can post the code to my entire program for compiling.

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Average Rainfall Main Class Using Nested For Loops Input Validation

Feb 23, 2014

When input validation for the first months rainfall is non-negative, this results in correct average rainfall.

When input validation is used for the first months rainfall I'm prompted to input a positive number, which is 2.

When asked to input rainfall, in inches, for each month, I begin with input -3, I am again prompted to re-enter a positive, I enter 3. What happens is, whichever positive integer I input after I had entered a negative for the first months rainfall, the average would be off by the positive number inputted.

package averagerainfall;
import java.util.Scanner;
public class AverageRainfall
{
public static void main(String[] args)
{
int maxYears;
int totalMonths;

[Code] ....

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EJB / EE :: Nested Jar Files Not Working While Included In Web Project

Sep 12, 2014

I have created a standalone project and included its jar file in lib folder as follows :

Sample->lib>jar files
sample->src->source files

After constructing my Sample application jar file as sample.jar and trying to include it in my another web project as follows:

WebSample->WebContent->WEB-INF->lib->sample.jar

and constructed war files as WebSample.war

After deploying it is not able to access jar files of sample application and throwing NoClassDefFoundError. Where as if I am running it as standalone project it is working. What is best solution to resolve this issue.

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Populate Array Using Nested Loops With Letter From A Until Y And Display Array To Screen

Nov 15, 2014

We were given a class lab that asks us to write a program that create a multidimensional array ( 5 x 5 ), populates the array using nested loops with letter from A until Y, and displays the array to the screen. and the result should look like this:

A B C D E
F G H I J
K L M N O
P Q R S T
U V W X Y

How to write this program.. I have tried all my best but the results are not coming like this..

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