How to replace strings in java

How do you replace part of a string in Java?

String class, you need to choose the right one for the job. For example replace(char oldChar, char newChar) is used to replace characters on String. You need to use the replace(CharSequence target, CharSequenece replacement) method to replace the substring in Java.

How do you replace one string in a text file in Java?

Step 1 : Create a File object by passing the path of the file to be modified. Step 2 : Initialize oldContent with an empty string. This String object will hold all the old content of the input text file. Step 3 : Create BufferedReader object to read the input text file line by line.

How do you replace two characters in a string in Java?

You can add more characters if you want! String. replaceAll(“[char1char2]”, “replacement”); where the first parameter is the regex and the second parameter is the replacement .

How do you replace a digit in a string in Java?

you can use Java – String replaceAll() Method. This method replaces each substring of this string that matches the given regular expression with the given replacement.12 мая 2014 г.

How do I remove a character from a string in Java?

How to remove a particular character from a string ?

  1. public class RemoveChar {
  2. public static void main(String[] args) {
  3. String str = “India is my country”;
  4. System.out.println(charRemoveAt(str, 7));
  5. }
  6. public static String charRemoveAt(String str, int p) {
  7. return str.substring(0, p) + str.substring(p + 1);
  8. }

How do you replace a character in a string in Java without using replace method?

To replace a character in a String, without using the replace() method, try the below logic. Let’s say the following is our string. int pos = 7; char rep = ‘p’; String res = str. substring(0, pos) + rep + str.

See also:  How to set classpath in java

How do you clear a text file in Java?

All you have to do is open file in truncate mode. Any Java file out class will automatically do that for you.

How do I remove special characters from a text file 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. }

What is Java FileWriter?

Java FileWriter class is used to write character-oriented data to a file. It is character-oriented class which is used for file handling in java. Unlike FileOutputStream class, you don’t need to convert string into byte array because it provides method to write string directly.

Can we convert StringBuilder to string in Java?

To convert a StringBuilder to String value simple invoke the toString() method on it. Instantiate the StringBuilder class. Append data to it using the append() method. Convert the StringBuilder to string using the toString() method.

How do I find a word in a string in Java?

JAVA Program

  1. public class SearchStringEmp {
  2. public static void main(String[] args) {
  3. String strOrig = “Hello readers”;
  4. int intIndex = strOrig. indexOf(“Hello”);
  5. if(intIndex == – 1) {
  6. println(“Hello not found”);
  7. } else {
  8. println(“Found Hello at index “+ intIndex);

How do you check if a word is present in a string in Java?

The third method you can use to check if one String contains another in Java is contains() method of String. This method returns true if a substring is present in String, or false otherwise. The only difference between contains() and indexOf() is that the former returns a boolean value while later returns an int value.

See also:  How to sort in java

How do you change the last character of a string in Java?

The easiest way is to use the built-in substring() method of the String class. In order to remove the last character of a given String, we have to use two parameters: 0 as the starting index, and index of the penultimate character.

Leave a Comment

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