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Best Practices for Java Developers

From my last 40 months of experience as a Java Developer, I am noting down some of the best practices I have observed: — There should not be more than 3 nested if-else/for/while. Ex. if() {if(){ while(){if()}}} is not allowed, because it will be hard to remember the logic. Don’t…

Java

4 min read

Published in wolfie/JavaChallenge

·Apr 18

JavaChallenge44

Please try to solve the challenge by yourself without any help from the compiler! Hint: Java9 Stream API, takeWhile(), dropWhile(), break; This challenge is made to check your Java 9 Stream API skills. For those who do not know, let’s understand the takeWhile() and the dropWhile() API of Stream…

Java 9

2 min read

Published in wolfie/JavaChallenge

·Jan 13

JavaChallenge43

Try to solve the challenge by yourself without any compiler’s help. We already have one challenge on this concept. Whoever follows the publication might be able to solve this challenge. This challenge is based on CachedInteger. Here is the old challenge. I will just mark down the answer, please go to the challenge for an explanation. Challenge Your Java Skill Thanks. Please follow the publication.

Java

1 min read

JavaChallenge43

Try to solve the challenge by yourself without any compiler’s help.

We already have one challenge on this concept. Whoever follows the publication might be able to solve this challenge. This challenge is based on CachedInteger. Here is the old challenge.

I will just mark down the answer, please go to the challenge for an explanation.

Challenge Your Java Skill

Thanks.

Please follow the publication.

Published in wolfie/JavaChallenge

·Oct 8, 2021

JavaChallenge42

Try to solve the challenge by yourself first! I got surprised when I saw the bytecode of the above code — public class JavaChallenge42 { public JavaChallenge42() { } public static void main(String[] args) {…

Java

2 min read

Published in wolfie/JavaChallenge

·Oct 8, 2021

JavaChallenge41

Try to solve the challenge by yourself first. Looks pretty simple, but did you know it already? The answer is — Got Challenged! Yes, it’s not Already knew . Not only this, but the following are also true — 1. -0==0.0 2. -0==0 3. -0==0.0D 4. -0==0.0f 5. 0==0.0f 6. 0==0.0D 7. 0==0.0 8. 0.0D==0.0f…

Java

2 min read

Published in wolfie/JavaChallenge

·Sep 19, 2021

JavaChallenge40

1. NullPointerException 2. Compile-time Error 3. nullJava Challenge Try to solve the challenge by yourself first. Surprisingly, It will not throw NullPointerException instead it will print nullJava Challenge . …

Java

1 min read

Published in wolfie/JavaChallenge

·Sep 19, 2021

JavaChallenge39

1. true 2. false 3. Ambiguitious 4. Compilation Error Try to solve the challenge by yourself first. We know that finally block always gets executed unless you are not exiting from the code. So, the answer will be false . But how the compiler will make sure that the…

Java

2 min read

Published in wolfie/JavaChallenge

·Sep 16, 2021

JavaChallenge38

1. 1 2. 0.9999999999999999 3. 1.0000000000000001 4. 0.9999999999999999D Try to solve the challenge by yourself first. The answer should be 1 but that’s not the case the answer is 0.9999999999999999 . Let’s see the bytecode — public class JavaChallenge38 { public JavaChallenge38() { } public static void main(String[] args) { System.out.println(0.9999999999999999D); } } So, at compile time only all 0.1 will be added, but it’s weird; so many of you will get a question —

Java

1 min read

JavaChallenge38

1. 1
2. 0.9999999999999999
3. 1.0000000000000001
4. 0.9999999999999999D

Try to solve the challenge by yourself first.

The answer should be 1 but that’s not the case the answer is 0.9999999999999999 . Let’s see the bytecode —

public class JavaChallenge38 {
    public JavaChallenge38() {
    }

    public static void main(String[] args) {
        System.out.println(0.9999999999999999D);
    }
}

So, at compile time only all 0.1 will be added, but it’s weird; so many of you will get a question —

Is floating point math broken???

Please go through the following links, it will help you to understand the entire concept —

Is floating point math broken?Floating point numbers are represented, at the hardware level, as fractions of binary numbers (base 2). For example…
stackoverflow.com

Why is 0.1 + 0.2 Not Equal to 0.3 in Most Programming Languages?It equals 0.30000000000000004
betterprogramming.pub

Thanks. Don’t forget to upvote.

Published in wolfie/JavaChallenge

·Sep 16, 2021

JavaChallenge37

1. 4 2. 3 3. Compilation Error 4. 2 Please try to solve the challenge by yourself first. When you will compile the above code snippet, you will get — incompatiable type: possibly loosy conversion from int to byte at line 6 So, how b++ and b+=1 is getting compiled successfully? Let’s remove line number 6 — public…

Java

1 min read

Published in wolfie/JavaChallenge

·Sep 16, 2021

JavaChallenge36

1. Compilation will fail because primitive(int) type can not be null. 2. It will throw NullPointerException. 3. 0 Try to solve the challenge by yourself first. This seems a pretty simple challenge, the compilation should fail because primitive type data can not be null because the ternary operator will…

Java

1 min read

Best Practices for Java Developers

JavaChallenge44

JavaChallenge43

JavaChallenge43

JavaChallenge42

JavaChallenge41

JavaChallenge40

JavaChallenge39

JavaChallenge38

JavaChallenge38

Is floating point math broken?

Floating point numbers are represented, at the hardware level, as fractions of binary numbers (base 2). For example…

Why is 0.1 + 0.2 Not Equal to 0.3 in Most Programming Languages?

It equals 0.30000000000000004

JavaChallenge37

JavaChallenge36

Govinda Raj