public class Demo3 {

public static void main(String[] args) {

// TODO Auto-generated method stub

String a = new String("hello"); // Immutable + String Pool

StringBuilder sb = new StringBuilder();

//StringBuffer sb = new StringBuffer(100);

//StringBuffer sb = new StringBuffer("hello"); // Mutable + No Pool

// hello + 16 = 5 + 16 = 21

System.out.println(sb.length());

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

sb.ensureCapacity(2000);

sb.append("How are you i am fine thank u jhjhgjghjhgjhjhjhjhgjghjhgjhgjhgjghjghjhgjhgjhgjghjghjghjghjghjghjghjgj");

System.out.println("Length "+sb.length());

System.out.println("Capcity "+sb.capacity());

// NewCapacity = OldCapacity * 2 + 2

// 44 = 21 * 2 + 2

}

}