FAQ: How To Get Rid Of Spaces In A String Java?

How do you remove spaces from a string in Java?

How do you remove all white spaces from a string in java?

  1. public class RemoveAllSpace {
  2. public static void main( String [] args) {
  3. String str = “India Is My Country”;
  4. //1st way.
  5. String noSpaceStr = str.replaceAll(“\s”, “”); // using built in method.
  6. System.out.println(noSpaceStr);
  7. //2nd way.

How do you remove spaces from a string?

Another option is to use replaceAll() method of the Java String class, passing regex ‘\s+’ as an argument for removing spaces. This option removes spaces in between the words too apart from leading and trailing spaces.

How do you remove spaces in ArrayList?

Removing spaces from an ArrayList

  1. public ArrayList removeSpace()
  2. {
  3. Iterator<String> it = array.iterator();
  4. while (it.hasNext())
  5. {
  6. if (it.next().equals(” “))
  7. {
  8. it. remove ();

How do you remove duplicate characters from a string in Java?

We should have to use the following steps for removing duplicates.

  1. In the first step, we have to convert the string into a character array.
  2. Calculate the size of the array.
  3. Call removeDuplicates() method by passing the character array and the length.
  4. Traverse all the characters present in the character array.
You might be interested:  Often asked: How To Initialize Arraylist In Java?

How do I remove all spaces from a string in Linux?

Use sed ‘s/^ *//g’, to remove the leading white spaces. There is another way to remove whitespaces using `sed` command. The following commands removed the spaces from the variable, $Var by using `sed` command and [[: space:]]. $ echo “$Var are very popular now.”

Does Scanf skip whitespace?

The blank tells scanf to skip white space and it will actually skip any number of white space characters before reading and storing a character. This shows that scanf does not insist that there be white space in the input, even though there is a blank in the format string.

How do I remove all special characters from a string in Java?

Example of removing special characters using replaceAll() method

  1. public class RemoveSpecialCharacterExample1.
  2. {
  3. public static void main( String args[])
  4. {
  5. String str= “This# string %contains^ special *characters&.”;
  6. str = str.replaceAll(“[^a-zA-Z0-9]”, ” “);
  7. System.out.println(str);
  8. }

How do you replace spaces in Java?

Program:

  1. public class ReplaceSpace.
  2. {
  3. public static void main(String[] args) {
  4. String string = “Once in a blue moon”;
  5. char ch = ‘-‘;
  6. // Replace space with specific character ch.
  7. string = string. replace (‘ ‘, ch);
  8. System. out. println(“String after replacing spaces with given character: “);

How do you remove blank spaces from an Arraylist in Java?

There are a few approaches that you could use:

  1. Iterate over the list, calling Iterator. remove () for the list elements you want to remove.
  2. Repeatedly call List. remove (Object).
  3. Create a new list, iterate over the old list, adding elements that you want to retain to a new list.
  4. If you can’t return the new list, as 3.
You might be interested:  Quick Answer: Java What Is A Parameter?

How do you remove spaces from a char array in Java?

JAVA

  1. public class removeWhiteSpace {
  2. public static void main(String[] args) {
  3. String str1=” Remove white spaces “;
  4. //Removes the white spaces using regex.
  5. str1 = str1.replaceAll(“\s+”, “”);
  6. System.out.println(“String after removing all the white spaces: ” + str1);
  7. }
  8. }

How do you reverse a string test?

1. First, convert String to character array by using the built in Java String class method toCharArray(). 2. Then, scan the string from end to start, and print the character one by one.

How do you remove duplicates from a string in Java without using collections?

Remove duplicates from arraylist without using collections

  1. package arrayListRemoveduplicateElements;
  2. import java.util.ArrayList;
  3. public class RemoveDuplicates {
  4. public static void main( String [] args){
  5. ArrayList<Object> al = new ArrayList<Object>();
  6. al.add(” java “);
  7. al.add(‘a’);
  8. al.add(‘b’);

Why is string immutable in Java?

The string is Immutable in Java because String objects are cached in the String pool. Mutable String would produce two different hashcodes at the time of insertion and retrieval if contents of String was modified after insertion, potentially losing the value object in the map.

Leave a Reply

Your email address will not be published. Required fields are marked *