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Best Java learning tips for competitive programming

Because of various reasons, students face many problems in java learning. Many errors that can occur during your competitive programming. Java is an object-oriented programing language. It helps to improve your programming understanding and coding skills.

Besides this, it will give you the solution to all the problems that hit in the mind. Most of the students ask the question of how can I use Java for competitive programming. In his article, we will provide complete knowledge of Best Java learning tips for competitive programming.

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Java learning tips for competitive programming

We discuss the some best Java learning tips for competitive programming:

Learn the basics:

It is important to know the fundamentals of any programming language. This is the perfect way to get started with something different. Do not have any anxieties; continue learning the language concepts. Get to know the area, and you’ll gradually become used to it in no time.

Prefer fundamental classes

Cover classes are often slower than in the first classes. While Primitive class only has values, the wrapper class stores information about the entire class. Since the classes also deal with object values, the desired results are not obtained by comparing them with primitive classe.

Practice Coding

The best thing to do when you have learned the fundamentals is to brush up your daily practice skills. True knowledge only comes when you implement what you have learned, as ‘Practice Makes a Perfect Man’ is said. So, more code than just reading. That will build your trust. Remember to practice always makes you better.

 The interface is better than the general class

There is no added heritage in Java, but if you want to implement anything like multiple inheritances without using the extends keyword, the interface should make it simpler. If things don’t go as you expected, you will still need to have an app by your side. An abstract class provides no right to provide a range of methods, just abstract methods.

Avoid random objects

Object development is one of Java’s most expensive operations. While making an object, you are using machine memory and processor speed to drive it. Objects should only be produced if they are required.

Don’t confuse between Collection and ArrayList

Developers also find it difficult to determine whether to go for data structure type Array or type ArrayList. They have distinct characteristics and can be seen in various cases. Arrays have fixed size, but variable sizes are available in ArrayLists. Changing the elements in ArrayList is much easier than Changing Array.

Use the series carefully

Developers also find it difficult to determine whether to go for a data structure type Array of type ArrayList. They have distinct characteristics and can be seen in various cases. Arrays have fixed size, but variable sizes are available in ArrayLists. Changing the elements in ArrayList is much easier than Changing Array.

Patience is the key

Learning Java can be daunting due to the amount of language content, but be careful, learn at your own speed, don’t hurry. Mastering Java is a time-consuming process. And note at some point even the best coders will be starting. But that’s not a big deal, just do as much as you can and continue to do. Give them your time. Patience is crucial to success.

Using java for competitive programming

We discuss how to use java for competitive programming. These are the following way java learning:

Fast Addition or Division by 2

Multiplying by 2 means shifting all the bits to the left, and dividing by 2 means shifting to the right.

Example : 2 (Binary 10): shifting left 4 (Binary 100) and right 1 (Binary 1)

n = n << 1; // Multiply n with 2 

n = n >> 1; // Divide n by 2 

Calculating the most significant digit

It can be used directly for determining the most important digit of any number log.

Assume that the number is P, then

Let double K = Math.log10(P);

now K = K – Math.floor(K);

int M = (int)Math.pow(10, K);

M will be the most significant digit.

Counting the number of digits directly

Instead of looping we can use log efficiently to calculate several digits in a number :

No. of digits in N = Math.floor(Math.log10(N)) + 1;

Reviewing for a prime number

Java has an inbuilt isProbablePrime() method. It returns true if this BigInteger is probably prime(with some certainty), false if it’s composite.

 Rotation and Frequency

We can use to rotate a collection or an array by a specified distance. You can also use the COLLECTION FREQUENCY method to get the Frequency of specified elements in a collection or an array.

How to become an expert in competitive programming?

We know that our reasoning behind any question in the high-level language is a code. Yet logic alone is not enough to write flawless code. It calls for a deeper understanding of technical terms such as complexity, syntax, and the art of creating broad solutions into the shortest possible codes. All of this can only be obtained through practice. Yet if practice combines into a masterpiece with proper direction, it bursts into one. The following easy steps will java learning achieve the goal:-

Get absolute understanding

First of all, you study all the programming language concepts in depth. Use standard books. Today there are many online forums available where geeks from all over the world share their expertise and seek to simplify the concepts. One such website is “geeks for geeks,” where you can find some of the most useful posts.

Implementation in real life

When you get used to the codes and the simple programming, try to build codes that will solve your everyday problems. This may include any student’s report card, ticket booking system, library management system, etc. They will make you feel like a developer in the app.

Enable code

Now the next step would be to shorten the code. Suppose you render the library management system easy code. Now try to abbreviate it in such a way as to accomplish the same task in a much simpler and shorter manner. You can only see the issue first, then make your own code. See the best approach now for learning how to reduce it. It is the most significant and most critical step of transformation from simple programming to competitive programs.

Read also…..

Causes of Memory Leaks in Java and How to Avoid Them


From the above discussion, now you know the best Java learning tips for competitive programming. We have listed down some of the problems students normally face java learning. Follow the above tips that will help you guide to competitive programming.

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