Slide 5.5: Calling a Java program (Java)

Exercise Construction Steps (Cont.)

Calling a Java Program (Java)
The Java program SearchString.java lists the number of keywords matched between the string (the first command-line argument args[0]) and the query (the second command-line argument args[1])

  shell> /usr/bin/java  SearchString \ 
           'PHP Java C# MySQL' 'mysql php'

The class java.util.StringTokenizer allows an application to break a string into tokens.

~/public_html/cgi-bin/280/5/SearchString.java

01// The StringTokenizer class is to break a string into tokens. 
02import java.util.StringTokenizer;
03 
04public class SearchString {
05 
06  // The main( ) method will be called first when program is executed.
07  public static void main( String args[ ] ) {
08    int count = 0;
09 
10    SearchString searchString = new SearchString( args[0], args[1] );
11    System.out.println( "The string: " + args[0] );
12    System.out.println( "The query: "  + args[1] );
13 
14    StringTokenizer keyword = new StringTokenizer( args[1], " " );
15    // hasMoreTokens( ) tests if there are more tokens available.
16    while ( keyword.hasMoreTokens( ) )
17      // nextToken( ) returns the next token.
18      count += searchString.keywordSearch( keyword.nextToken( ) );
19    System.out.println( "Number of keywords found: " + count );
20  }
21 
22  // Two member variables
23  private String str;
24  private String query;
25 
26  // A constructor
27  public SearchString( String s, String q ) {
28    str   = s;
29    query = q;
30  }
31 
32  // A member method
33  public int keywordSearch( String keyword ) {
34    // indexOf( ) returns the index position of the first occurrence of
35    // a specified string.  -1 is returned if the string is not found.
36    if ( str.toUpperCase( ).indexOf( keyword.toUpperCase( ) ) != -1 )
37      return( 1 );
38    else
39      return( 0 );
40  }
41}