package org.codehaus.plexus.util;
   
   import org.junit.jupiter.api.Test;
   
   /**
    * <p>PerfTest class.</p>
    *
    * @author herve
    * @since 3.4.0
   */
  class PerfTest {
      String src = "012345578901234556789012345678901234456789012345678901234567890";
  
      private final int oops = 100;
  
      @Test
      void subString() {
          StringBuilder res = new StringBuilder();
          int len = src.length();
          for (int cnt = 0; cnt < oops; cnt++) {
              for (int i = 0; i < len - 5; i++) {
                  res.append(src, i, i + 4);
              }
          }
          int i = res.length();
          System.out.println("i = " + i);
      }
  
      @Test
      void resDir() {
          StringBuilder res = new StringBuilder();
          int len = src.length();
          for (int cnt = 0; cnt < oops; cnt++) {
              for (int i = 0; i < len - 5; i++) {
                  res.append(src, i, i + 4);
              }
          }
          int i = res.length();
          System.out.println("i = " + i);
      }
  }