StringBuffer is a class that facilitates string operations and also helps reduce memory usage. A method defined on StringBuffer named setLength(int newLength) also serves as a shortcut to clear the contents of the StringBuffer.

Listing 1. Code Snippet

public class StringBufferEx{   public static void main(String args[])   {      StringBufferEx stringBufferEx = new StringBufferEx();      stringBufferEx.proceed();   }      private void proceed()   {      StringBuffer stringBuffer = new StringBuffer("Initial value");      System.out.println(String.format("%-35s %s" ,"With inital value: ", stringBuffer));      stringBuffer.setLength(0); //Setting the lenght to zero (0), which will also clear the contents of the StringBuffer      System.out.println(String.format("%-35s %s" ,"After setting the lenght to zero: ", stringBuffer));      stringBuffer.append("New value");      System.out.println(String.format("%-35s %s" ,"With new value: ", stringBuffer));   }}/*

Listing 2. Expected output

[root@mypc]# java StringBufferExWith inital value:                  Initial valueAfter setting the lenght to zero:With new value:                     New value*/