String formatting in a java programe

String formatting

import java.util.*;

public class StringFormat

{

   public static void main(String[] args)

  {

      double e = Math.E;

      System.out.format("%f%n", e);

      System.out.format(Locale.GERMANY, "%-10.4f%n%n", e);

   }

}

public class StringConcatenate

 {

   public static void main(String[] args)

   {

      long startTime = System.currentTimeMillis();

      for(int i=0;i<5000;i++)

      {

         String result = "This is"

         + "testing the"

         + "difference"+ "between"

         + "String"+ "and"+ "StringBuffer";

      }

      long endTime = System.currentTimeMillis();

      System.out.println("Time taken for string" + "concatenation using + operator : "       + (endTime - startTime)+ " ms");

      long startTime1 = System.currentTimeMillis();

      for(int i=0;i<5000;i++)

      {

         StringBuffer result = new StringBuffer();

         result.append("This is");

         result.append("testing the");

         result.append("difference");

         result.append("between");

         result.append("String");

         result.append("and");

         result.append("StringBuffer");

      }

      long endTime1 = System.currentTimeMillis();

      System.out.println("Time taken for String concatenation"  + "using StringBuffer : "+ (endTime1 - startTime1)+ " ms");

   }

}