substring.java

金旭亮的java教案

// SubString.java
// This program demonstrates the
// String class substring methods.
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 ) + "\"";
                //(起始下标,要拷贝子串的最后下标加1但不包括该下标)

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

      System.exit( 0 );
   }
}