Java StringBuffer

What is StringBuffer in java programming ?

StringBuffer is a peer class of String that provides the functionalities of strings.

String represents fixed length immutable character sequences but StringBuffer is growable and mutable character sequences.

StringBuffer may have characters and substrings inserted in the middle or appended to the end. StringBuffer automatically grow to make room for such additions and often has more characters preallocated than actually required.

StringBuffer Constructors

StringBuffer(int size)
StringBuffer(String str)

StringBuffer Methods Example

public class StringBufferTest {
	public static void main(String args[]){
		StringBuffer sb = new StringBuffer("Testing");
		System.out.println("After append:");
		sb.insert(0, "Hi,");
		System.out.println("After insert:");
		sb.delete(0, 4);
		System.out.println("After delete:");
		System.out.println("After setLength:");
		sb.setCharAt(0, 'h');
		System.out.println("After setCharAt:");
		System.out.println("After reverse:");
$ javac
$ java StringBufferTest 
After append:
After insert:
After delete:
After setLength:
After setCharAt:
After reverse:

ensureCapacity method

void ensureCapacity(int capacity);

Here capacity specifies the size of the string buffer.

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