import java.util.Date;

public class StringEfficiencyExample {

	public static void main(String[] args) {
		StringBuffer stringBuffer = new StringBuffer();
		String string = new String();
		
		long startTime, stopTime;
		//NOTE: Clock time isn't a precise measure but
		//      this can give us a rough idea.
		

		System.out.println("How is the StringBuffer grown?");
		for (int i = 0; i < 10; i++) {
			stringBuffer.append("123456789");
			System.out.println(
					"Used: " + stringBuffer.length() +
					" Capacity: " + stringBuffer.capacity()
			);
		}

		
		
		/*
		startTime = new Date().getTime();
		System.out.print("How long to append 123456789 5000 times? ");
		for (int i = 0; i < 5000; i++) {
			stringBuffer.append("123456789");
		}
		stopTime = new Date().getTime();
		System.out.println("Milliseconds elapsed: " + (stopTime-startTime));
		
		
	
		startTime = new Date().getTime();
		System.out.print("What if we do this with String? ");
		for (int i = 0; i < 5000; i++) {
			string += "123456789";
		}
		stopTime = new Date().getTime();
		System.out.println("Milliseconds elapsed: " + (stopTime-startTime));
		*/
	
	}

}

//Copyright 2010-2015 : Evan Golub