Complex Java Programs
To know more and in-depth about a programming language, one should practice the specific programming language programs. Working with programs will make you learn and understand the programming language better and will never forget the concepts when implemented practically. Especially if you are a beginner, then it is good to start with the programs to understand several concepts in the Java programming language. But one should also notice that if you are new, then first read and understand the concepts and then implement the concepts.
Here, in this section, we will try to understand some basic concepts by implementing the related examples such as arrays, strings, multithreading, OOPs, and many more. We will see few complex examples to know how complex programs can be created and implemented.
Let's begin the implementation of the Java programs by understanding a simple basic program.
Basic Java Program
To find the factorial of a number in Java
Below is the code given that implements the factorial of a number n using the for loop:
The code snippet is shown below:
Implementing the factorial program using Recursion
Below is the code given that implements the factorial of a number n using Recursion:
The code snippet for the above code is shown below:
Complex Array Program Implementation
To find the difference between the maximum and minimum number in an array.
Below we have implemented a one-dimensional array in Java where we have created a user-defined class:
Solution: The task we have to complete is to find the minimum value, maximum value and then finally find the difference between the max and min value. The code will be as follows:
The snippets for the above code in Eclipse are represented below:
Thus, in this complex array program implementation, we covered three tasks, i.e., how to find the largest value, smallest value and calculating the difference between two values.
Implementing Complex String Program in Java
To compare StringBuffer object to String Object in Java
Below we have implemented a string program where we have compared a StringBuffer object (which is an object used for creating modifiable String objects) to a simple String object. The code for the program is as follows:
The code snippet for the above program in Eclipse can be seen below:
In the output, it is clear that when the object of the StringBuffer is equal to the String object, it displays the message that both are equal. Else, the output is displayed that the objects are not equal.
Complex Multithreading Example
Multithreading is the concept used for removing CPU overheads by executing two or more parts of a program simultaneously in the form of threads.
Below we have created a multithreading program where we have created multiple threads in a program as:
The code snippet for the above code in Eclipse IDE is shown below:
Inheritance Program in Java
The term inheritance means inheriting the behavior and properties of the parent class to its child class.
Below is the implementation of the inheritance program in Java:
The code snippet for the above code in Eclipse is represented as:
Miscellaneous Java Programs
Implementing a few miscellaneous types of complex programs that are generally asked:
Deadlock is a condition that occurs in multithreading where two or more processes get blocked forever. When there are two or more threads, the condition of deadlock occurs because all threads try to execute their section first, and thus deadlock occurs, and no thread is able to get executed.
Below we have implemented a deadlock program where we have created such a scene where more than one thread is created, and none of them are able to get executed. Here is the code:
The code snippet for the above program is represented in Eclipse as:
Checking if two strings are Anagram in Java
The term anagram means checking if two strings contain the same characters but are present in a different order. Such strings are known as Anagram Strings. For example, spot and post, ten and net, and so on.
Below we have implemented a program taking two strings from the user and then checked if these strings are Anagram or not. Here is the code:
The code snippet for the above code in Eclipse is shown below:
These are few complex programs coded in Java programming which are generally asked in interviews type questions.