Exercises

Bruce Eckel's Thinking in Java Contents | Prev | Next

  1. Create a class myString containing a String object that you initialize in the constructor using the constructor’s argument. Add a toString( ) method and a method concatenate( ) that appends a String object to your internal string. Implement clone( ) in myString. Create two static methods that each take a myString x handle as an argument and call x.concatenate(“test”), but in the second method call clone( ) first. Test the two methods and show the different effects.
  2. Create a class called Battery containing an int that is a battery number (as a unique identifier). Make it cloneable and give it a toString( ) method. Now create a class called Toy that contains an array of Battery and a toString( ) that prints out all the batteries. Write a clone( ) for Toy that automatically clones all of its Battery objects. Test this by cloning Toy and printing the result.
  3. Change CheckCloneable.java so that all of the clone( ) methods catch the CloneNotSupportedException rather than passing it to the caller.
  4. Modify Compete.java to add more member objects to classes Thing2 and Thing4 and see if you can determine how the timings vary with complexity – whether it’s a simple linear relationship or if it seems more complicated.
  5. Starting with Snake.java, create a deep-copy version of the snake.
4



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: March 19, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT The 2015 Enterprise Mobile Application Survey asked 250 mobility professionals what their biggest mobile challenges are, how many employees they are equipping with mobile apps, and their methods for driving value with mobility. Join Dan Woods, Editor and CTO of CITO Research, and Alan Murray, SVP of Products at Apperian, as they break down the results of this survey and discuss how enterprises are using mobile application management and private …

  • According to a 2014 Javelin Strategy & Research Study, there is a new victim of fraud every two seconds – and that's just in the U.S. With identity theft and consumer fraud rising, and more frequent and sizable data breaches in the news, financial institutions need to work harder than ever to protect their customers and their business. Download this white paper to learn how you can use multi-channel communications to minimize the costs of fraud while also increasing customer loyalty.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date