Append a String onto another String

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This example shows how to append several Strings, depending on how many arguments that are passed to the main method from the command line.
It uses a StringBuffer object to append each String. This is more efficient than using the + operator, since that will produce a new String in memory every time a concatenation occurs.
Finally it uses a System.out.println statement to print out the appended string. Since we want to print out the contents of the StringBuffer, the toString() method is called on it.

package com.javadb.examples;

public class Append {
   public static void main(String args[]) {

     // Create a StringBuffer object named buf.
     StringBuffer buf = new StringBuffer();

     // Checks for the number of arguments on
     // the command line, then loops through them
     for (int i=0; i < args.length; i++) {

     // For each argument besides the first,
     // append comma to end of buffer
       if (i != 0) {
         buf.append(", ");
       }

       // Add all arguments to the
       // StringBuffer object buf.
       buf.append(args[i]);
     }
     // Converts the StringBuffer arguments
     // to simple strings and prints to screen.
     System.out.println(buf.toString());
   }
}

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