StringBuffer capacity()

The current length of a StringBuffer can be found via the length( ) method.

The total allocated capacity can be found through the capacity( ) method.

int capacity()
Returns the current capacity.
int length()
Returns the length (character count).

public class Main {
  public static void main(String[] argv) {
    StringBuffer sb = new StringBuffer();
    sb.append("java2s.com");
    
    System.out.println(sb.length());

    System.out.println(sb.capacity());
  }
}

The output: 


10
16


public class Main {
  public static void main(String[] argv) {
    StringBuffer sb = new StringBuffer();
    sb.append("java2s.com");
    
    System.out.println(sb.length());
    System.out.println(sb.capacity());
    
    sb.trimToSize();
    
    System.out.println(sb.length());
    System.out.println(sb.capacity());

  }
}

The output: 


10
16
10
10
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    Essential Classes  

StringBuffer:
  1. Create StringBuffer object
  2. append
  3. StringBuffer capacity()
  4. charAt(int index): get the char at specified index
  5. delete(int start, int end) and deleteCharAt(int index)
  6. ensureCapacity( )
  7. getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)
  8. indexOf(String str)
  9. lastIndexOf(String str)
  10. StringBuffer length()
  11. Insert(): add data in the middle of a StringBuffer
  12. replace():replace a StringBuffer
  13. StringBuffer reverse()
  14. setCharAt(int index, char ch)
  15. setLength
  16. substring
  17. toString():Convert StringBuffer to String