substring.java

我在学习JAVA的讲义

import javax.swing.*;

public class SubString {
   public static void main( String args[] )
   {
      String letters = "abcdefghijklmabcdefghijklm";
      String output;

      // test substring methods
      output = "Substring from index 20 to end is " +
               "\"" + letters.substring( 20 ) + "\"\n";

      output += "Substring from index 0 up to 6 is " +
                "\"" + letters.substring( 0, 6 ) + "\"";

      JOptionPane.showMessageDialog( null, output,
         "Demonstrating String Class Substring Methods",
         JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );
   }
}