How to use trimToSize() method in Java?

TrimToSize.java

package rashid.jorvee;

public class TrimToSize {
	
	public static void main(String[] args) {
		StringBuffer copyText=new StringBuffer();
		copyText.append("trim to size method in java");
		System.out.println(copyText +", and length of StringBuffer copyText is:" +copyText.length());
		System.out.println("Capacity of copyText is::"+copyText.capacity());
		copyText.trimToSize();
		System.out.println(copyText +", and length of StringBuffer copyText after trimToSize()  is:" +copyText.length());
		System.out.println("Capacity of copyText after trimToSize() is::"+copyText.capacity());
	}
}

Output of this program:

trim to size method in java, and length of StringBuffer copyText is:27
Capacity of copyText is::34
trim to size method in java, and length of StringBuffer copyText after trimToSize()  is:27
Capacity of copyText after trimToSize() is::27