



|
|
My Intro to Object-Oriented Programming
|
Programming Challenge Archive
Laboratory Challenges
String Thing
|
|
|
This laboratory introduced us to the
String Class
of the
java.lang
package. We engaged in some simple string processing and wrote some operators.
Laboratory Challenges --
String Thing
// General Information
// -------------------------------------------------------+
-----
// File: StringThingApp.java
// Type: java application file
// Date: November 1998
// Name: BLUE
// Line: Simple String Processing Application
// Application Description
// ------------------------------------------------
/*
Simple String processing application.
*/
// Required Packages
// -------------------------------------------------
import blue.io.*;
// Application Class
// ------------------------------------------------
class StringThingApp
{
// main method
static public void main (String args[])
{
// Create and print some strings which represent nam+
es
String singer = "Holliday, Billie";
String sculptor = "Claudel, Camille";
// Point A
String self = "Norkoli, Jeff";
IO.println(singer);
IO.println(sculptor);
IO.println(self);
// Computer and print the lengths +
// Point B
int singerLength = singer.length();
int sculptorLength = sculptor.length();
int selfLength = self.length();
IO.println(); IO.println("Lengths ...");
IO.println(singerLength);
IO.println(sculptorLength);
IO.println(selfLength);
// Computer and print first names +
// Point C
String singerFirst = singer.substring(10);
String sculptorFirst = sculptor.substring(9);
String selfFirst = self.substring(9);
IO.println(); IO.println("First names ...");
IO.println(singerFirst);
IO.println(sculptorFirst);
IO.println(selfFirst);
// Computer and print last names +
// Point D
String singerLast = singer.substring(0,8);
String sculptorLast = sculptor.substring(0,7);
String selfLast = self.substring(0,7);
IO.println(); IO.println("Last names ...");
IO.println(singerLast);
IO.println(sculptorLast);
IO.println(selfLast);
// Computer and comma position within names +
// Point E
int singerPos = singer.indexOf(",");
int sculptorPos = sculptor.indexOf(",");
int selfPos = self.indexOf(",");
IO.println(); IO.println("Comma positions ...");
IO.println(singerPos);
IO.println(sculptorPos);
IO.println(selfPos);
// Computer and print first names +
// Point F1
singerFirst = firstName(singer);
sculptorFirst = firstName(sculptor);
selfFirst = firstName(self);
IO.println(); IO.println("First names ...");
IO.println(singerFirst);
IO.println(sculptorFirst);
IO.println(selfFirst);
// Computer and print last names +
// Point G1
singerLast = lastName(singer);
sculptorLast = lastName(sculptor);
selfLast = lastName(self);
IO.println(); IO.println("Last names ...");
IO.println(singerLast);
IO.println(sculptorLast);
IO.println(selfLast);
// Computer and print full names +
// Point H1
String singerFull = fullName(singer);
String sculptorFull = fullName(sculptor);
String selfFull = fullName(self);
IO.println(); IO.println("Full names ...");
IO.println(singerFull);
IO.println(sculptorFull);
IO.println(selfFull);
}
// Point F2
// operator-style method to compute first name
static private String firstName(String fname)
{
int space = fname.indexOf(" ");
String first = fname.substring(space);
return first;
}
// Point G2
// operator-style to compute last name
static private String lastName(String lname)
{
int comma = lname.indexOf(",");
String last = lname.substring(0,comma);
return last;
}
// Point H2
// operator-style to compute full name
static private String fullName(String fullname)
{
int comma = fullname.indexOf(",");
int space = fullname.indexOf(" ");
String full = fullname.substring(comma + 2)
+ fullname.substring(space, space + 1) +
fullname.substring(0, comma);
return full;
}
}
// Demo
// --------------------------------------------
/*
$ javac StringThingApp.java
$ java StringThingApp
Holliday, Billie
Claudel, Camille
Norkoli, Jeff
Lengths ...
16
16
13
First names ...
Billie
Camille
Jeff
Last names ...
Holliday
Claudel
Norkoli
Comma positions ...
8
7
7
First names ...
Billie
Camille
Jeff
Last names ...
Holliday
Claudel
Norkoli
Full names ...
Billie Holliday
Camille Claudel
Jeff Norkoli
$
*/
|
|
|