How To Compare String Input To Char Array

Feb 8, 2014

What I'm trying to do is compare String input to a char array. Let me make it a little more plain, I'm working on a cipher assignment, and my line of thought is this: I will get String input from the user, COMPARE the characters in the string input to an alphabet array, which will then be compared to the cipher array so that the cipher's counterpart can be chosen over the alphabet's. Any way that I might compare the random input keyed in by the user to that alphabet array?

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Return Given Char That Matches Input String

Apr 17, 2015

Processing a string. How would I only return a given char that matches the input string e.g. v and/or n and/or m.

Everything else that does not match will return a '*' - e.g. user input = t result = *

I assume I need to also iterate through this input string using charAt() ?

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How To Compare Int To Empty String To Input Error

Apr 16, 2015

I am having issues with the program below everything works but I can't figure out a way to add code that if a user just hits enter without inputting anything it says "entering in nothing is not a valid choice" I am stuck on how to compare a int to a string ...

//import statements
import java.util.*; //for scanner class
// class beginning
public class Guess {
public static void main(String[] args ) {
//Declare variables area

[Code] ....

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How To Compare Int To A Empty String To Input Error Message To User

Apr 16, 2015

I made a guess a number program but I am having issue figuring out a way that when a user enter's in nothing for the program to spit out a message saying "hey entering nothing doesn't work try again" then ask for input. I have done some research and from what I have found is to read the input in as a String rather than int, and use something like Integer.valueOf() to get the integer value but I am completely lost on how to apply that to my program here is my code

//import statements
import java.util.*; //for scanner class
// class beginning
public class Guess {
public static void main(String[] args ) {
//Declare variables area
int guess, secretNumber = (int) (Math.random() * 10 + 1), lowGuess,highGuess;

[Code] ....

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How To Compare String To Each Element Of String Array

Mar 28, 2014

How do I compare a String to each element of a string array?

For example:

int headscount = 0;
if (coins[i].equals("heads")){
headscount++;
System.out.println("b" + headscount);
}

This doesn't give me the right value because the IDE says that equals() is an incompatible type. I also tried changing the "heads" to an variable, but the results remains the same.

I would prefer using an Array!

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Convert String Array To Char Array

Apr 12, 2015

I have an array of Strings, one on each line and I need to convert them into an array of char's.

For Example:

This
is
an
Example
of
what
my
input
is.

In order to accomplish that I did the following-

String[] lotsOfText = a.gettingAnArrayAsAReturn();
char [][] myCharArray = new char [lotsOfText.length] [lotsOfText.length];
for(int i=0; i<lotsOfText.length; i++){
for(int j=0;j<lotsOfText[i].length();j++){
myCharArray[i][j] = lotsOfText[j].charAt(j); }}

But whenever I try this and then try to print the output :

for (int i = 0; i < lotsOfText.length; i++) {
for (int j = 0; j < lotsOfText[i].length(); j++) {
System.out.print(myCharArray[i][j]);
}
}

I get nothing. I'm not sure what's the flaw in my logic, is it the char array initialization that's wrong or is it something else ?

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Finding A String Word In Char Array

Feb 13, 2015

I'm trying to find a word in an array of char.....but I'm stuck. How to formulate the code to step through the array and pick out the word. This is what I have so far...

public static void searchAcross(String string, char[][] puzzle) {
// Gets the number of rows in the matrix
int rowLength = puzzle.length;
//Gets the number of columns in the matrix.
int colLength = puzzle[0].length;

[Code] ....

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How To Compare Integer To A String Variable Array

Apr 17, 2014

I'm trying to do something like this:

Java Code:

for (int i=1; i<2; i++);
int randomNum = rn.nextInt(range) + 1;
if (randomNum == CardList.CARD_NAME[randomNum]){
} mh_sh_highlight_all('java');

But the CARD_NAME variable is a string. I just want to compare the array to the integer.

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How To Compare Two Char Type Values?

Feb 8, 2015

how can i compare two char type variables, ignoring the Case?

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Char Array To A String Array With Hex

Nov 16, 2010

I have a string array but each cell in the 1d string array stores each character the text file is :

"START START START
The quick brown fox jumps over the lazy dog 1234567890-= !"$%^&*()_+ QWERTYUIOP{}ASDFGHJKL:@~|ZXCVBNM<><? /.,mnbvcxzasdfghjkkl;'#][poiuytrewq789654123.0
+-*/``""$% hello this is a test file using all the characters availible on the keyboard for input END END END END"

so in the string it is:[0] = S, [1]=A, [2]=R ...ect along the text basically i need to convert each character in each cell of the 1d string array to its hesidecimal value..i have created my own method which will take in a char and return a string containing the charcters hex value.

public static String toHex(char c) {
char char2ascii = c;
int i = 0;
int num = (int) char2ascii;
String hex ="";

[code]...

what i want to do is run each cell through the toHex method so i eventually have a string array containing the hex value of each character in my text.

example..i want:

String[] hexarray = S, T, A, R, T

a run it through my method to convert to hex then it will become

String[] hexarray = 53, 54, 41, 52, 54

Im not allowed to use inbuilt libarys and classes to do the hex conversion thats why i have my own method for it .

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How To Get 1st Letter Of Input (String) And Compare It To Single Letter Before Insert To DB

Apr 15, 2014

Example : I have code and name but my code must start with the first letter of the inputed name if the 2 input is match it will be inserted into database

code = "A"001
name ="Angela"
= success this will inserted into database

else

code ="B"002
name="Angela"
=failed this will not inserted into database

else

code="A"003
name="Andy"
=success still accepts the input cause they have diff code number

What I am thinking on this was compare the code the name? if == it will be inserted but how do i get the 1st letter of the input name?

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Get User Input For A Char Value?

Jan 9, 2015

I am trying to get user input for a char value and am having some difficulty getting input for a char value.

Java Code:

//imports packages
import java.io.*;
import java.text.DecimalFormat;
class ModuleCulminatingTask {
public static void main (String args []) {
//declares variables
float var3, var4;
long var5 = (int)(Math.random()*10);

[code]....

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Swing/AWT/SWT :: Compare Inputted String With Key String

Aug 28, 2014

I have a method for a button so when a user inputs something it then will get the string value and check it against the string value within the properties file to see if it exists.

The properties file is called GitCommands.properties that contains -- > key = value <-- in it

I realised I have not used it correctly hence why I keep getting errors - I am lost on how to use it, I think perhaps that may be the issue here? I need to reference the file but I am doing it wrong? When I do use that piece of code I get null pointer exception too...

textFieldSearch.getText().equals(GitCommands.keys());

This is my button:

JButton btnSearch = new JButton("Search");
btnSearch.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
FindSelectedKey();

[code] .....

I understand I am missing my piece of code where it states "//determine whether the string is equal to the property file key string" I understand the logic fine but not actually coding it.

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How To Use Previous String Compare To Current String

Mar 2, 2014

I'm having trouble to compare two string from my LinkedList. I took me 2 days now trying figure out how to compare the current string to previous string in the linkedlist. Here is my code.

public int compareTo(LinkedListNode n){
//Compare two string
String myHead = data.toLowerCase();
String comparableHead = data.toLowerCase();
 
return (myHead.compareTo(comparableHead));
}

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Change Input String To Array Of Characters

Dec 11, 2014

I am trying to change an input String to an array of characters, but it only stores the word before the space into the array. Here is the code:

Scanner scanner = new Scanner(System.in);
System.out.println(" Enter text: " );
String text = scanner.next();
char[] characterArray = text.toCharArray(); // convert string to array of characters
String char = "";
for( i = 0; i < characterArray.length; i++) {
char = char + characterArray[i]
} System.out.println(char);

Just typing hello gives me hello, but when I type hello world it does not type in the word "world".I am trying to change an input String to an array of characters, but it only stores the word before the space into the array.Here is the code:

Scanner scanner = new Scanner(System.in);
System.out.println(" Enter text: " );
String text = scanner.next();
char[] characterArray = text.toCharArray(); // convert string to array of characters
String char = "";
for( i = 0; i < characterArray.length; i++) {
char = char + characterArray[i]
} System.out.println(char);

Just typing hello gives me hello, but when I type hello world it does not type in the word "world".

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Blue Pelican Java - Array Of Hope - Char Array For Loops?

Feb 13, 2014

i am working on the same project and i got the code to make them print going down but not sideways.

public class ArrayofHope
{
public static void main(String args[])
{
System.out.println("Decimal Character
");
for(int j = 65; j <= 90; j++)
{
System.out.print(j);
System.out.println(" " + (char)j); //Character
}
}
}

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Store String Input In Array And Print In Reverse Order

Apr 5, 2014

I have a college question ask me to write a class StringRevert which does the following:

-prompting user for an interger n
-creating an array of n string
-repeatedly read character string from user input and store them in the array until end of array is reached or user input -quit(quit should not saved in array)
-print the string from array in reverse order, from last enter to first enter.
-assume user always supplie correct input

This is what I've done so far but how to get it working.

import java.util.Scanner;
public class StringRevert {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("enter value of n: ");
int n1 = in.nextInt();
String[] n = new String[n1];

[Code] ....

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Compare User Input To Text File

Jun 6, 2014

I'm attempting to compare user input to a text file that I have set up whenever the user types in an employee ID number. I want to be able to tell the user that either the ID number is valid, or that it is not valid and must be re-entered by comparing it to the employee.txt file, and then record the valid ID number to the timeclock.txt file. I'm recording the next available employee ID number instead of the one I typed in. The output of the program looks like this: i82014/06/06 12:16:56 (I typed 1 as the employee ID.)

import java.text.*;
import java.util.*;
import java.io.*;
import java.nio.file.*;

public class TimeClockApp {
// declare class variables
private static EmployeeDAO employeeDAO = null;
private static Scanner sc = null;

[code]....

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Char To String

Oct 14, 2014

I need making char[] to a string im not entirely sure what to change i'm just suppose to use a string value but the upperclassmen used char:

char[] number = clear.toLowerCase().toCharArray();
for(int c = 0; c < number.length; c++) {
if(digit[c] < 'a' || digit[c] > 'z')
continue;

[code]...

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How To Compare String In If Else

Feb 10, 2009

how do i compare string in if else ?

cos if i do these, it get an error of

Comparing string using == or !=

if(carModel == "Honda") {

car.setCarID(1);

car.setCarModel("Toyota");

car.setCarDescription("Powered by VVTi Engine");

car.setCarTransmission("Auto");

car.setCarPrice(56000);

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How To Put All Char In Loop To String

Mar 16, 2014

I can't figure out how to have all of the random characters generated to go into the String. Below I can only get the last character to covert over to a String.

System.out.println("Original random character string:");
String printingString = "a";
for (int i = 0; i < 50; i++)//loop to obtain 50 random characters
{
char randomChar = (char) ((Math.random() * 255) +32);
System.out.print(randomChar);
printingString = Character.toString(randomChar); }
return printingString; }

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Getting Char At A Location In String

Oct 21, 2014

I found a fun program online and something so simple is giving me an issue. I c++ it is pretty simple fix, I can just call the strings location like an array. In java this is not the case. So far i have tried:

myString.charAt();
myString.indexOf();

There are a few other I found on google but I forget at the moment. I am just trying to close the gap on a string. It was a full sentence and I used replaceAll a few times to get several words I didn't want in the file out.

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Compare Substring With String?

Apr 22, 2014

Why isn't it working?

Java Code:

if ((line.substring(i,i+2)) == "go")
break; mh_sh_highlight_all('java');

I printed this to check if substring works fine, used this:

Java Code: System.out.println(line.substring(i,i+2) + " : "+ length); mh_sh_highlight_all('java');

So, output:

Er : 1

ra : 2

ag : 3

go : 4

on : 5

n' : 6

'> : 7

Line:

String line = "Eragon'>";

Shouldn't it break loop after printing "go : 4"?

line.substring(i,i+2) prints go here. But if doesn't work.

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How To Compare Public String Value

Sep 7, 2014

I want to make a program in which i write the Months Strings via while into the checkbox.

I already did that but i have also to add an day if February is a loop day.

So my question is how to say java that if Months is equal to February & year is a leap year, add 1. (i didn't wrote the year code because it's not relevant for my problem.)

Java Code:

public String[] Months ={"January","February","March","April","May", "June", "July", "August", "September", "Oktober", "November", "December"};
public Asg1KeapYear() {
initComponents();
int MonthNo = 0;

[Code] ....

Netbeans shows me .equals() on incompatible types on Months.equals, do i have to declare it somehow?

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Comparing Char In If That Convert To String

Apr 30, 2014

what will i compare in if statemet is the 1st letter of each if i have code="a" and name="Angelina" first letter of each is "a" and "A" then in convert it to string so that i can make it uppercase but when i compare it in if statement it always go into "not x" but the ouput that im getting is x=A y=A then it always direct me into else statement.

String code = "a";
String name = "Angelina";
char c = code.charAt(0);
char n = name.charAt(0);

[code]...

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Check How Many Times Char Is Used In The String

Apr 1, 2014

I tried to make a program that takes a string str, and char a and checks how many times the char is used in the string.

Example: the string Welcome and the letter e, is 2 times. so the program should print 2.

It compiles but when I run it and enter the information, i cannot get the printing line out.

Heres my code:

import java.util.Scanner;
class program
{
public static void main(String[] args) {
Scanner user_input=new Scanner(System.in);
String str;
String b;
System.out.print("Please enter a word");

[Code] .....

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