How to Buffer Strings in Java

Buffering strings is a technique where the system temporarily stores parts of the strings in a buffer before processing them or printing them out. The following are different methods in Java to buffer a string

• Using the emit method for string buffering

• Using the StringBuffer class

Using the emit method for string buffering

The emit method collects parts of a string into a buffer and returns the buffer once it reaches a certain length. This reduces the inefficiency caused by continuous string concatenations.

Example

The following is an example using the emit method for string buffering

public class StringBuffer {
   public static void main(String[] args) {
      countTo_N_Improved();
   }
   private final static int MAX_LENGTH = 30;
   private static String buffer = "";
   private static void emit(String nextChunk) {
      if(buffer.length() + nextChunk.length() > MAX_LENGTH) {
         System.out.println(buffer);
         buffer = "";  
      }
      buffer += nextChunk;
   }
   private static final int N = 100;
   private static void countTo_N_Improved() {
      for (int count = 2; count 
Output
2 4 6 8 10 12 14 16 18 20 22
24 26 28 30 32 34 36 38 40 42
44 46 48 50 52 54 56 58 60 62
64 66 68 70 72 74 76 78 80 82

Using the StringBuffer Class
StringBuffer is a class that represents a mutable sequence of characters. It offers an alternative to the immutable String class and enables you to change the contents of a string without having to create a new object every time.
Example
The following is an example using the StringBuffer class 
public class HelloWorld {
   public static void main(String []args) {
      StringBuffer sb = new StringBuffer("hello");
      sb.append("world");
      sb.insert(0, " Tutorialspoint");
      System.out.print(sb);
   }
}

Output
Tutorialspointhelloworld

java_strings.htm