public class StringBufferDemo {
public static void main(String[] args) {
// Creating a StringBuffer object
StringBuffer sb = new StringBuffer("Hello");
// 1. append()
sb.append(" World");
System.out.println("After append: " + sb);
// 2. insert()
sb.insert(5, ",");
System.out.println("After insert: " + sb);
// 3. replace()
sb.replace(5, 6, "!");
System.out.println("After replace: " + sb);
// 4. delete()
sb.delete(5, 6);
System.out.println("After delete: " + sb);
// 5. deleteCharAt()
sb.deleteCharAt(5);
System.out.println("After deleteCharAt: " + sb);
// 6. reverse()
sb.reverse();
System.out.println("After reverse: " + sb);
// Reversing back to original for further operations
sb.reverse();
// 7. setCharAt()
sb.setCharAt(5, '-');
System.out.println("After setCharAt: " + sb);
// 8. substring()
String subStr = sb.substring(0, 5);
System.out.println("Substring (0, 5): " + subStr);
// 9. length()
int length = sb.length();
System.out.println("Length of StringBuffer: " + length);
// 10. capacity()
int capacity = sb.capacity();
System.out.println("Capacity of StringBuffer: " + capacity);
// Additional methods for better understanding
// Ensure Capacity
sb.ensureCapacity(50);
System.out.println("New Capacity after ensureCapacity(50): " + sb.capacity());
// Trim to Size
sb.trimToSize();
System.out.println("Capacity after trimToSize: " + sb.capacity());
}
}
