# ensureCapacity(int minCapacity) StringBuffer method in java

ensureCapacity(int minCapacity): ensures that the capacity is at least equal to the specified minimum.

Syntax:

public void ensureCapacity(int minCapacity)


Note:

• If current capacity is greater than the argument there will be no change in the current capacity.
• If current capacity is less than the argument there will be change in the current capacity using below rule.
newcapacity = (oldcapacity*2) + 2

## Example:

StringBufferEnsureCapacityExample.java

/** * This program is used to show the use of ensureCapacity() method. * @author w3spoint */ class TestStringBuffer{ StringBuffer sb = new StringBuffer();   /** * This method is used to show the use of ensureCapacity() method. * @author w3spoint */ public void ensureCapacityTest(){ //default capacity. System.out.println(sb.capacity());   sb.append("Hello "); //current capacity 16. System.out.println(sb.capacity());   sb.append("www.w3spoint.com"); //current capacity (16*2)+2=34 i.e (oldcapacity*2)+2. System.out.println(sb.capacity());   sb.ensureCapacity(10); //now no change in capacity because //minimum is already set to 34. System.out.println(sb.capacity());   sb.ensureCapacity(50); //now (34*2)+2 = 70 as 50 is greater than 34. System.out.println(sb.capacity()); } }   public class StringBufferEnsureCapacityExample { public static void main(String args[]){ //creating TestStringBuffer object TestStringBuffer obj = new TestStringBuffer();   //method call obj.ensureCapacityTest(); } }

## Output:

16 34 34 70