Part 2. f. Create a new StringBuilder Object using no-arg constructor. g. Using for loop append the array elements one by one to the StringBuilder (one per loop iteration h. Record a run-time it took to append all integers to the StringBuilder (record run-time of 2.g.))

Create a java file - Performance.java and copy the code to the file. You have to run the program 3 times. Change the SIZE to 500 and then to 5000 and copy the time taken from the output and create the table.

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public class Performance {
 public static void main(String[] args) {
 // change the SIZE to 500, 5000 to repeat for big array size
 final int SIZE = 50;
 System.out.println("Array Size: "+ SIZE);
 //a
 int[] array = new int[SIZE];
 //b
 for (int i = 0; i < SIZE; i++) array[i] = i;
 //c
 String stringObject = new String();
 // d record time
 long startTime = System.currentTimeMillis();
 for (int i = 0; i < SIZE; i++) stringObject += array[i];
 long endTime = System.currentTimeMillis();
 //e
 System.out.println("Time to append using string object: " + (endTime - startTime) + " ms.");
 //f
 StringBuilder builder = new StringBuilder();
 startTime = System.currentTimeMillis();
 for (int i = 0; i < SIZE; i++) builder.append(array[i]);
 endTime = System.currentTimeMillis();
 //e
 System.out.println("Time to append using string builder object: " + (endTime - startTime) + " ms.");
 }
}

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