e4_13.java

来自「java 初学者学习实例」· Java 代码 · 共 70 行

// Fig. 11.5: StringIndexMethods.java
// String searching methods indexOf and lastIndexOf.
import javax.swing.*;
//StringIndexMethods 
public class E4_13{

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

      // test indexOf to locate a character in a string
      String output = "'c' is located at index " + letters.indexOf( 'c' );

      output += "\n'a' is located at index " + letters.indexOf( 'a', 1 );

      output += "\n'$' is located at index " + letters.indexOf( '$' );

      // test lastIndexOf to find a character in a string
      output += "\n\nLast 'c' is located at index " +
         letters.lastIndexOf( 'c' );

      output += "\nLast 'a' is located at index " +
         letters.lastIndexOf( 'a', 25 );

      output += "\nLast '$' is located at index " +
         letters.lastIndexOf( '$' );

      // test indexOf to locate a substring in a string
      output += "\n\n\"def\" is located at index " +
         letters.indexOf( "def" );

      output += "\n\"def\" is located at index " +
         letters.indexOf( "def", 7 );

      output += "\n\"hello\" is located at index " +
         letters.indexOf( "hello" );

      // test lastIndexOf to find a substring in a string
      output += "\n\nLast \"def\" is located at index " +
         letters.lastIndexOf( "def" );

      output += "\nLast \"def\" is located at index " +
         letters.lastIndexOf( "def", 25 );

      output += "\nLast \"hello\" is located at index " +
         letters.lastIndexOf( "hello" );

      JOptionPane.showMessageDialog( null, output,
         "String searching methods", JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );
   }

}  // end class StringIndexMethods

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