substringexample.java

java 完全探索的随书源码

public class SubstringExample
{
  // Default Constructor
  public SubstringExample()
  {
    super();
  }

  // Method that actually performs the extraction
  public String extractSubstring( String str1, int beginIndex, int endIndex )
  {
    return str1.substring( beginIndex, endIndex );
  }

  // Main Method
  public static void main( String[] args )
  {
    if ( args.length != 3 )
    {
      System.out.println( "Usage: java StringCompareExample <String1> <String2>" );
      System.exit( 0 );
    }

    String str = args[0];
    String beginIndexStr = args[1];
    String endIndexStr = args[2];
    int beginIndex = 0;
    int endIndex = 0;

    // Make sure the arguments are valid
    try
    {
      beginIndex = Integer.parseInt( beginIndexStr );
      endIndex = Integer.parseInt( endIndexStr );
    }
    catch( NumberFormatException ex )
    {
      System.out.println( "The arguments are invalid" );
    }

    // Create an instance of the example
    SubstringExample example = new SubstringExample();
    // Get the strings passed in from the command line

    // Inform the user what is going on
    System.out.println( "Extrating from string: '" + str + "' starting at: " + beginIndex + " endIndex: " + endIndex );

    // perform the comparison
    String newSubstring =  example.extractSubstring( str, beginIndex, endIndex );

    System.out.println( "Substring: " + newSubstring );
  }
}