Advanced Topics in Java: Core Concepts in Data Structures by Noel Kalicharan

By Noel Kalicharan

Java is likely one of the most generally used programming languages this day. It was once first published by means of sunlight Microsystems in 1995. through the years, its recognition has grown to the purpose the place it performs an enormous function in so much of our lives. From laptops to facts facilities, online game consoles to clinical supercomputers, cellphones to the net, Java is all over! There are lots of functions and lots of web sites that may not paintings except you might have Java put in, and extra are created on a daily basis. And, after all, Java is used to strength what has turn into the world's such a lot dominant cellular platform, Android.

Advanced themes In Java teaches the algorithms and ideas that any budding software program developer should still recognize. You'll delve into themes akin to sorting, looking, merging, recursion, random numbers and simulation, between others. you'll bring up the variety of difficulties you could clear up in case you the best way to create and control flexible and well known facts constructions similar to binary timber and hash tables.

This ebook assumes you've gotten a operating wisdom of simple programming innovations corresponding to variables, constants, task, choice (if..else) and looping (while, for). It additionally assumes you're ok with writing features and dealing with arrays. for those who examine this ebook rigorously and do the routines carefully, you will develop into a greater and extra agile software program developer, extra ready to code today's functions - regardless of the language.

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Author (of type String) is set to null; remember that String is an object type. title (of type String) is set to null. 0. pages (of type int) is set to 0. binding (of type char) is set to '\0'. inStock (of type boolean) is set to false. We could specify an initial value when we declare an instance variable. 25; private static int MinBooks = 5; 33 CHAPTER 2 N INTRODUCTION TO OBJECTS private private private private private private String author = "No Author"; String title; double price; int pages; char binding = 'P'; // for paperback boolean inStock = true; } Now, when an object is created, author, binding, and inStock will be set to the specified values while title, price, and pages will assume the default values.

It also has a method to add 1 to the frequency of a word. freq is its frequency. incrFreq(). Next, we will define a WordInfo array; each element will hold information about one word. WordInfo[] wordTable = new WordInfo[MaxWords + 1]; 58 CHAPTER 2 N INTRODUCTION TO OBJECTS MaxWords denotes the maximum number of distinct words catered for. For testing the program, we have used 50 for this value. If the number of distinct words in the passage exceeds MaxWords (50, say), any words after the 50th will be read but not stored, and a message to that effect will be printed.

We could write the following to assign null to the Part variable, p: Part p = null; In effect, this says that p has a defined value, but it does not point to anything. If p has the value null, it is an error to attempt to reference an object pointed to by p. price since p is not pointing to anything. If two object variables p and q are both null, we can compare them with ==, and the result will be true. On the other hand, if p points to some object and q is null, then, as expected, the comparison is false.

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