Why does the substring method subtract an extra 1?
For example:
myString = "Programming and Problem Solving";
myString.substring(0, 7) would be "Program" instead of "Program".
It's not explained in the book I'm reading and didn't see it online.
I'm still working with the singlylinkedlist data structure and trying to return a string of individual characters stored in each node. ( head--('J')---('A')---('V')---('A')---tail ) Hopefully this beautifully executed depiction to the left will clarify.
This is what I came up with after designing the algorithm w/ pen and paper. I know that I'm not accounting for the OutOfBound errors, an empty list, or an index < 0.... I will get to that.
Right now, I'm not sure why my assignment to the character array, ' chars[i] = cursor.getLink(getElement()); ' , is not working. The two methods getLink and getElement, type Node and T, respectively, exist in my Node class which is a private nested class in MySLList. Why would I be getting the following error: "The method getElement() is undefined for the type StringX" ? Is this a good design and implementation of the substring method?
public String substring(int index) {
char[] chars = new char[(getSize() - index)]; //getSize() defines the size of list in MySLList
Node cursor = null;
//Set the cursor to the node = index
if(cursor == head) {
[Code] ....
public static void main (String [] args) {
int a = (int) 0.25;
int b = (int) 1.25;
int result = a + b;
System.out.println("Result of addition is "+ result);
}
}
I've been working on this problem for a while now and continue to get an error when I try to subtract one user inputted integer from another. It seems to compile fine for adding, dividing, and multiplying. Why it might be making that error and how to resolve it? (As an aside, I have no idea if I did the whole program right but am just trying to figure out why a declared int would come back with an error it's a string.)
import java.util.Scanner;
public class Calculate2
{
public static void main(String[] args)
{
int firstInt;
int secondInt;
int choice;
[Code] ....
My code runs and compiles just fine when I insert 3 values, however, if I add anymore values NOTHING happens. When I hit the compile button, my mouse pointer turns into that loading circle thing and after 3 seconds it disappears and nothing happens. No error or anything in the console, just BLANK. This problem occurs on line 12 in my main method, and my insert method is on line 41 in the third class..Here is my main method
public class TestAVLTree {
public static void main(String[] args) {
/*test at least 2 diff data types*/
//AVL of ints
AVLTree<Integer> avlInt = new AVLTree<Integer>();
avlInt.insert(100);
avlInt.insert(50);
avlInt.insert(200);
//avlInt.insert(3); fails here. could it be my insert method?
//avlInt.insert(17);
[code]....
I have a simple Word Program here called PuzzleGame.java. It works perfectly but I wanted to add some bells and whistles to it. So I want to be able that if the user selects the same letter more than once a message comes up letting the user know that "That letter has already been selected, try another letter."
I am certain that if would go in the 'else' of the 'if( )' that I am providing.
import java.util.Scanner;
public class PuzzleGame {
public static void main(String[] args){
String secretPhrase = "BIG JAVA";
String guesses = " ";
[Code] .....
I am thinking maybe after the else in this if statement.
if(guesses.indexOf(secretLetter)== -1) {
System.out.print("-");
notDone = true;
} else {
//something here. I am not sure how to go about it.
System.out.print(secretLetter);
}
there is a main JPanel in my application in that main JPanel i want to add two JPanels with a seperator in between . Though i have added the seperator but its taking some extra space and when i am changing its size , there is no effect . how can i remove/reduce this extra space taken by JSeperator? below is view logic ,
mainPanel = new JPanel(new GridLayout());
jp = new JPanel(new GridLayout(8, 2, 5, 5));
jp2 = new JPanel(new GridLayout(8, 1, 5, 5));
jText = new JTextField(10);
jText2 = new JTextField(10);
jText3 = new JTextField(10);
[code]....
I'm trying to use regex to find a word containing the substring "cat." I'm not sure why this isn't working?
String match = "^ cat$";
I have one column "category" which contain data like
`"Failed extract of third-party root list from auto update cab at: [URL] with error: The data is invalid."`
I need to select url part in between `" < > "` sign of category column.
how to do this usign regex?
(Check substrings) You can check whether a string is a substring of another string by using the indexOf method in the String class. Write your own method for this function. Write a program that prompts the user to enter two strings, and checks whether the first string is a substring of the second.
What the function should return
public class Ex2 {
public static void main(String[] args) {
System.out.println("Input the first string:");
Scanner input = new Scanner(System.in);
String firstString = input.nextLine();
System.out.println("Input the second string:");
String secondString = input.nextLine();
check(firstString,secondString);
[Code] ....
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.
Write a program that reads number between 1,000 and 999,999 from the user and prints it without a comma separating the thousands. Read the input as string. Find the length of the string and use the substring to break it into two pieces. Do not include the comma. You can then concatenate using the + symbol to reassemble without the comma. For example if the number is 123,456. First would equal 123 and second would equal 456. noCommaNumber - 123456.
I do not think it is required to only allow numbers in that range in the code. My question is how to get the first half of the number before the comma in a string to make the last line work. What I think is not doing what I need is the line String first = numberIn.substring(numberIn.indexOf(",", 0)); This is just the last thing I tried.Getting the second half is done using IndexLastOf method in the substring class javaforumquest.jpg
I have to alter my Sentence class to find the index of the substring "sip" in Mississippi but I'm really not sure where to begin. This is what I have...
Sentence.java
public class Sentence {
private boolean outcome;
private String sentence;
public Sentence(String aSentence) {
sentence = aSentence;
[Code] ....
I know that I need to change public boolean find(String t) to public int indexOf(String t) but I'm not sure what to start doing to get the index of "sip".
I am trying for a logic that i have some emp ids as a string seperated by commas and i need the substring of emp ids as below. splitting the string as below.
public static void main(String args[]) {
String empId = "1,2,3,4,5,6,7,8,9,10";
int i;
int count = 9;
for (i = 0; i <= count; i = i + 3) {
System.out.println("Emp IDs are : " +empId);
}}
Result is:
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
But I want the result like:
Emp IDs are : 1,2,3
Emp IDs are : 4,5,6
Emp IDs are : 7,8,9
Emp IDs are : 10
Need code logic or regex to get substring between two different delimiters and then parse it into Integer array.
My Input String is : Transmitter#MSE14_REC_FTP40 #138^TPPurgeUility_test #103^YUG_Trans #57^
Output (ie. substring between "#" and "^")
138
103
57
I'd like to know how to return a new array, I wrote in a method below the main method. I want to print the array but system.out.print doesn't work for arrays apparently. What structure i should use?
View Replies View RelatedI have to write a method called censor that gets an array of strings from the user as an argument and then returns an array of strings that contains all of the original strings in the same order except those with length of 4. For example if cat, dog, moose, lazy, with was entered, then it would return the exact same thing except for the words with and lazy.
Currently, my code so far just prints [Ljava.lang.String;@38cfdf and im stuck.
import java.util.Scanner;
public class censorProgram {
public static void main (String args[]){
Scanner input = new Scanner (System.in);
System.out.println ("How many words would you like to enter?");
int lineOfText = input.nextInt();
[Code] ....
I have to make new string array in the method and return words without four letters in the main method
Consider the following recursive method that calculates the greatest common divisor using Euclidean method.
PHP Code:
public static int GCD ( int x , int y )
{
if ( y == 0 )
return x;
else if ( x >= y && y > 0)
return GCD ( y , x % y );
else return GCD ( y , x );
}
Trace the above method for x=32 and y=46
Alright, I don't understand how to link my compress method to my return statement method "getPText". Also in my compression I only want it to compress for 3 or more consecutive letters.
import java.util.Scanner;
class RunLengthCode {
String pText;
String cText;
void setPText(String PText) {
pText = "";
}
[Code]...
I have two classes (Daughter and Son) that contain some very similar method definitions:
public class Family {
public static void main(String[] args) {
Daughter d = new Daughter();
Son s = new Son();
d.speak();
s.speak();
[Code] .....
Each of those classes has a "speak" method with two out of three lines being identical. I could move those into a parent class, but I need each of the child classes to continue to exhibit its unique behavior. I'm trying the approach below, which replaces the unique code with a call to a "placeholder" method that must be implemented by each child class:
public class Family {
public static void main(String[] args) {
Daughter d = new Daughter();
Son s = new Son();
[Code] .....
This works and moves the shared code from two places (the Daughter and Son classes) into one place (the new Mother class, which is now a parent class of Daughter and Son). Something about this feels a bit odd to me, though. It's one thing for a child class to override a parent class's methods to extend or alter their behavior. But, here, I've implemented an abstract method in the parent class to alter what happens when the parent class's method (speak(), in this case) is called, without overriding that parent class method itself.
I am just trying to test this array, for a locker combination program that involves classes...but the array is printing out the whacky numbers for the location. When I try to call the method in the main, it does not work. How do I call a method that exist within a class into the main method?
public class locker {
public static void main(String[] args) {
CombinationLock();
[code]....
Which method is used while passing or returning a java object from the native method?
View Replies View RelatedI am trying to call a private method to another method that are located in the same class.
I am trying to call prepareString to the encode method below.
Java Code:
public class ShiftEncoderDecoder
private String prepareString(String plainText)
{
String preparedString = "";
for(int i = 0 ; i < plainText.length();i++)
if(Character.isAlphabetic(plainText.charAt(i)))
[Code] .....
I am currently working on a dice game. I have a private method called rollDice and it performs the action of rolling two dice. For my project, I need to create another method called playerRolls and I am supposed to invoke the rollDice method in the playerRolls method and perform actions based off of that. My question right now is how do I invoke a method into another method of the same class?
View Replies View RelatedI need to write a method that will consume string representation of Object type and will return one object of this type. How to set return type for the method in this case?
Here is exmaple :
public <?> identifyType(String typeString){
if (typesString.matches("String")){
return new String("");
}else if (typeString.matches("Integer")){
return new Integer(0);
}
//....etc..}
Java-code, When i compile the java doc. I get output;
Perceptron.java:12: learn(Instance[],int,int) in Perceptron cannot be applied to (Instance[],int)
PerceptronModel model = learn(train_data,5);
^
1 error
And here is the code
import java.io.*;
public class Perceptron {
public static void main(String[] args) throws IOException {
DataReader reader = new DataReader();
reader.init(args);
[Code] ....