Java Program to Clear the StringBuffer

May 23, 2023

What are Strings?

A string is a sequence of characters. In Java, strings are used to represent text. You can use strings to store messages, names, and other kinds of text data.
Strings are usually represented as a series of characters enclosed in quotation marks. For example, in Java, you can create a string like this:
String s = “Hello World”;

In this Article, we will write a program to check if two strings are anagram.

Strings:

We can use the various methods of the String class to manipulate strings.
For example, you can use the length() method to get the length of a string, the substring() method to get a substring of a string, and the toUpperCase() method to convert a string to uppercase. You can also use the + operator or the concat() method to concatenate two strings.

What is StringBuffer?

In Java, a StringBuffer is a class that provides a mutable sequence of characters. It is similar to a String, but can be modified after it is created. StringBuffer is thread-safe, meaning that multiple threads can access a single StringBuffer instance without causing any problems. This makes it a useful choice for use in a multithreaded environment. Some common methods of StringBuffer include append(), insert(), replace(), and delete().
There are Several ways to delete the content or clear a stringbuffer in java, some of the widely and common used ways in java are :

By changing its length to 0.
By creating a new instance of the StringBuffer.
By using delete Function
By using replace Function

Program to clear StringBuffer by Changing the length to 0

Run

import java.util.*;

public class Main{
  public static void main(String[] args) {
    // creating a string buffer
    StringBuffer Prep = new StringBuffer();

    // add string to string buffer
    Prep.append("Lakshit");
    Prep.append(" Mittal");
    System.out.println("Before Clearing: " + Prep);

    // clearing the stringbuffer using setLength()
    Prep.setLength(0);
    System.out.println("After Clearing: " + Prep);
  }
}

Output:

Before Clearing: Lakshit Mittal
After Clearing:

Program to clear StringBuffer by Creating a new Instance :

Run

import java.util.*;

public class Main{
  public static void main(String[] args) {
    // creating a string buffer
    StringBuffer Prep = new StringBuffer();

    // add string to string buffer
    Prep.append("Lakshit");
    Prep.append(" Mittal");
    System.out.println("Before Clearing: " + Prep);

    // clearing the stringbuffer using new instance
    Prep = new StringBuffer();
    System.out.println("After Clearing: " + Prep);
  }
}

Output:

Before Clearing: Lakshit Mittal
After Clearing:

Program to clear StringBuffer by using Delete Function :

Run

import java.util.*;

public class Main{
  public static void main(String[] args) {
    // creating a string buffer
    StringBuffer Prep = new StringBuffer();

    // add string to string buffer
    Prep.append("Lakshit");
    Prep.append(" Mittal");
    System.out.println("Before Clearing: " + Prep);

    // clearing the stringbuffer using new instance
    Prep.delete(0, Prep.length());
    System.out.println("After Clearing: " + Prep);
  }
}

Output:

Before Clearing: Lakshit Mittal
After Clearing:

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