import java.util.ArrayList;
import java.util.List;

public class ComparisonTest2 {
    public static void main(String[] args) {
        String[] array = new String[30000];
        
        for (int i = 0; i < 30000; i++) {
            array[i] = Integer.toString(i);
        }
 
        StringBuffer buffer = new StringBuffer();
        long start = System.currentTimeMillis();
        for (int i = 0; i < 100; i++) {
            for (String s : array) {
                buffer.append(s);
            }
        }
        long end = System.currentTimeMillis();
        System.out.println("Šg’£ for •¶: " + (end - start));


        buffer = new StringBuffer();
        start = System.currentTimeMillis();
        for (int i = 0; i < 100; i++) {
            for (int j = 0; j < array.length; j++) {
                buffer.append(array[j]);
            }
        }
        end = System.currentTimeMillis();
        System.out.println("for •¶: " + (end - start));
    }
}