I am writing a Java permutation program, it takes in N and k and gives k amount of combinations based on N length.
That portion works, but the portion I have that does not work is when k is greater then 1, the array is then then printing strings out of index.
The perm algorithm ends on index - 1 for moving characters but then I push all those characters into an Array List, I would think I could print them off however I want from there but that is not the case. I'll include the minimum amount of code possible.
//permString = 1234 or something, it doesn't matter
//Use Case N = 4 k = 3, prints out 123,124,132,134 ect
//Use Case N = 4 k = 2, error index out of range but only on the printing function; the perm function doesn't take k and
//is based on length
//the "" is just an empty string
permNow("", permString);
}
Ok, so I'm just trying to write a basic little program that reverses the letters in someone's name. I thought I had it down, but I guess not. Here's the code, and the error I'm getting is:
java.lang.StringIndexOutOfBoundsException: String index out of range: 11 (in java.lang.String) (11 is the length of the name I'm inputting) import java.io.*; import java.util.*;
public class op{ String word = "Hello"; //my variable public void reverseword() //My function { for(int i =word.length();i>=0 ;i--) { System.out.println(word.charAt(i));
[code]....
when i call function in main i have this error:
run: Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 5 at java.lang.String.charAt(String.java:658) at javacourse.Car.opname(Car.java:35) at javacourse.JavaCourse.main(JavaCourse.java:24) Java Result: 1
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String ind ex out of range: 10 at java.lang.String.charAt(String.java:658) at StringChar.main(StringChar.java:11)
Code :
class StringChar{ public static void main(String ss[]){ String str="HelloWorld"; int a; System.out.println("String is = " + str); a=str.length(); System.out.println("String is After Reverse"); for(int i=a;i>=0;i--) System.out.print(str.charAt(i)); } }
The method I am trying to successfully write is startsWith(String s1, String s2)
The intention of the code is to return true if s2 starts with the string s1, and false otherwise. For example,
x.startsWith("Maplestory","Maple"); Should return true.
This code partially works, depending on the values entered into it. When it is supposed to return true, it does do this. When it is meant to return false, I get a StringIndex OutOfBounds Exception.
public class CC02{ String remove1(char c, String s){ String to_return=""; while(true){ if(s.equals("")) return to_return;
[Code] ....
The method I have written uses one other method from my code, which is "reverse". Any way to return false without getting this error.
I am trying to write a program which asks the user to enter two numbers and then do the arithmetic operation based on user's input . No compiling errors but when I run the program I keep getting "StringIndexOutOfBounds" error .
class arithmetic { public static void main(String[] args){ Scanner in = new Scanner(System.in); int ent1 = 0;
My Computer Programming teacher has given the class a problem that requires the use of var.charAt(), var.length() and while/for. Basically, the problem is that we have to create program that'll show a mirrored or reverse version of the entered word. Like for example, if your input is the word "Hello" (the quotation marks aren't included), the output will be "olleH".
Here's the code:
import java.io.*; public class StringMirror {public static void main (String [] args) throws IOException {BufferedReader scan = new BufferedReader (new InputStreamReader(System.in)); String enteredWord = ""; int lengthOfTheWord = 0; int lengthOfTheWordMinusOneVersion = 0;
[code]....
It is working, but the problem is that after the output, there's this error that says String index out of range: -1.
the program is working but I kind of wanted it to have no errors in the end.
I'm trying to put together a method that formats telelphone numbers, but there's a part of my code that not working. If I enter (305)912-5458 into the variable phoneNumb I get an index is out of range error. I added a lot of system out messages so that I can try to get an idea of why the code was crashing.
public static void main(String[] args) { int intBegin = 0; int intEnd = 1; int length; String charact; StringBuilder numbuilder = new StringBuilder();
[Code] .....
The error message I'm getting is:
run: The length is 13 intBegin is at 0 intEnd is at 1 index is at 0 Charcter ( was not inserted
I need to use print not println to declare stuff and I need to have string literals I think that's /n. Now when I compile it just shows row1, row2 ect. Why does it work like that?
public class art { public static void main(String[] args) { //local variables String row1= "***********************"; String row2= "** *** *** **"; String row3= "** ***** ***** **";
This is the code that I have so far, It will only print out the digit if it is entered first..How to I get it to print out all digits? and I am getting an error that the c is not initialized
import java.util.*; //Write a program that prompts the user for some text. Output only the digits in that text. Hint: Use a loop and the Character.isDigit method. public class Q1 {
Write an application that asks the user to enter his/her first name, last name, birthday, and where you born (all fields type String) and prints their information to the console. Use the techniques discuss in class. The data must be encapsulated. The program must be coded in Notpad++ and compiled in the Command Prompt.
Output should be like this:
Welcome!
What is your first name? Carlos
What is your last name? De La Torre
When is your birthday? 08/12/1979
Where did you born? Puerto Rico
First Name: Carlos
Last Name: De La Torre
Birthday : 08/12/1979
Born in : Puerto Rico
This is what I have so far :
package myinfo; import java.util.Scanner;
public class MyInfo { private String name; private String lastName; private String birthday; private String birthPlace;
Currently, my program converts Long values to String. And when I test it out, it do print out the correct output. However, when the converted String value is passed over to be written in a text file, it seems that BufferedWriter isn't printing out the outcome that it's supposed to be.
saltVs = Long.toString(saltV); System.out.print(saltVs); //will print out 79723172
Now the problem is here...It only prints out the last digit of the String value (instead of 79723172).
Here is my FileWriter/BufferedWriter part.
Why is that when I run my program using command prompt, it prints out the output that I wanted, but however when it comes to writing to the file, it doesn't come out right.
I am using ui:repeat tag to iterate over a list. Now in that I need to do some processing based on the current iteration index like we have in a normal for loop. I have to do some processing based on the current iteration index. How can I get that.
Code is supposed to count number of Words in a String between A-Z and a-z, i am aware there are many methods to do this more efficiently, but i would prefer to do it using the methods shown.
class // Purpose : 1) Write a program which will input a string from the //keyboard, and output the number of separate words, //where a word is one or more characters separated by //spaces. Your program should only count as words groups //of characters in the ranges A..Z and a..z // { public static void main(String args[])
I am attempting to get the x and y coordinate of a matrix of buttons. I have googled my way to failure and read the docs and I think I am traveling of track.
Below is where I create a matrix of buttons via Swing
public class View extends Mybuttons{ private static final long serialVersionUID = 1L; JFrame frame; JPanel matrixPanel, optionsPanel; Mybuttons[][] matrixBtn;
Later in this class:
JPanel matrixPan(){ matrixBtn = new Mybuttons[25][25]; JPanel panel = new JPanel(); panel.setSize(550,550); panel.setLayout(new GridLayout(25,25)); //creating a 25x25 matrix of buttons
[Code]...
In the controller class I am trying to get the index of each button in the getUnvisitedChildNode method. I need to do this so I can search the buttons around the button passed to it and check if they are been visited yet. Below getUnvisitedChildNode you will be bfs (breadth first search).
private Mybuttons getUnvisitedChildNode(Mybuttons b){ //example of some of the things I have tried int x= Mybuttons.getComponentAt(b); int y= Mybuttons.indexOf(b); int j=0; return b; }
So I am working on an assignment and ran into an annoying bug. Basically i have a menu that accesses an ArrayList of Videos which may or may not be read from a file, one of the options of the menu is to edit an existing Video. For this I ask the user for the number of the video and it is checked against the list of video numbers if it returns a match, the method gets the index of the Video object and stores it in a temporary variable the user is allowed to edit the details and the object is put back into the ArrayList using the variable and the ArrayList's set() method
My problem is that once i finish editing the details of a video it gives me a indexOutOfBounds exception
On further investigation using a method that goes through the index of every object in the ArrayList using indexOf() i found out that every single object has been given the index of -1 and not 0,1,2,3 etc.. This is my first error and have not expierenced any other before.
The objects do exist because I have read them from a file. I can also add new Objects and view them successfully but they still have the same index . I have checked my syntax and everything and no errors, this happens at run time only.
I have even created some other ArrayLists seperately and debugged them and their index order is fine. I am too far into this project to start over. I've also tried cleaning the project(my IDE is Eclipse).
Im working on my homework and it mentioned element for one exercise and an index in another, what is the difference, If Any, Between An Element And An Index?
If the user for example enter the number 2 for index I need to swap the matrix from this index two lines with two line so this is the result what I need
I'm new to java and I write a simple "Five in a row" game. I have a fixed 13*13 board which contains 169 buttons in an arraylist. Everytime player clicks the button the game set a value of 'x' or 'o' to the arraylist name value. And I have a method named isWon() to check if the it is won or not after player click the button. The game sometime gets and index out of bound exception when checking for whose win.
ArrayList<Character> value = new ArrayList<>(); constructor() { for (int i = 0; i < 169; i++) {
