All right, so let's start and take a look at the first question. And this is the most viewed question and Stack Overflow since creation of this platform, and it has over 5.7 million views over the years. The question is, how do I convert a string to an int in Java? As you all know, strings are representations for text, and unusual texts are characters like ABCDE, and so on. But texts can also be numbers are digits. And if a string represent represents only a single number, there might be the use case that you want to convert the string into an integer or into a number.

And in this case, in this question, is the use cases to convert and string into an int Java knows two different approaches to do this. And both approaches and both methods are located in the same class. It's in the integer class, you all know. And the first method you can use it use this is a pass end method. And the second one is the value of method of the integer class. So both methods get as paramita a string and converts it into a number.

And the difference between both is that in the first case, the method returns in plain primitive int. And the second method value of returns whole object integer object wrapper object of the primitive and so um, yeah, it costs much more working space for your computer to create instacharge then primitive end. So be aware of the fact if you want to, to convert 1000 or 10,000 strings into a number and be aware of the fact that a 10 thousands interchange are very or might be expensive for your computer for your working storage. So in this case, I would prefer to use pass end. But if you only want to convert one or two or three strings, it doesn't matter in my opinion, what you are using regarding the the working space, but if you need an entity object you should use value off if you are confident with only primitive and you should use partland method.

Both methods can broadside either negative or positive numbers. So if you are string s that will pass in the method begins with minus sign. So a negative number. Yeah, Java, recognize this and yeah, returns a negative number. So, both is possible, negative and positive. As you can see both numbers throws both methods, sorry, throws the number format exception.

So the number format exception as an unchecked exceptions. unchecked exception is an exception that occurred and you don't have to process it so you don't have to try catch it. Your method and don't have to throws the exception and so on. So you don't have to process it and But if you want to do this, you, you are able to do. And it depends on what your stuff looks like. So if you have, for example, a use case, where you want a user to type in a number, or with his keyboard, and you want to continue by passing the number into an int or a number.

So in this case, it would be useful to recognize a number format exception or queues. Because in this case, if you try if you catch a number format exception, you will get or you will have the opportunity to ask the user again and say sorry, user, your you typed in, string wasn't a number. So please try again, to give me a number now. So you can do this As long as you want and as long as you get to number or not a number, and so yeah, it's up to you if you catch the number format exception. Yeah, but it's up to you because it is an unchecked exception. So both pass and value of throw stem because yeah, if your string isn't a number, then both methods throw the number format exception.

So let's take a look at an example. I have three different examples. The first one uses the past pass in methods you see here. So as string a string, I pass negative 16 as string, so everything is okay. This one is negative number. It's okay Java can processes or posit into a number.

So if you continue with the process, cram the value of number one, the number one variable is minus 16. The second example is very easy to it's the value of method to string, it's the same, it's negative 16. And the integer dot value off method returns an integer object. It's called number two in this case. And the third example, in this case, I will pass a string that isn't a correct number. So I tablets, the negative the minus sign, and Java detects this.

And, yeah, throws number format exception. I catch this in this case and print the stack trace of it. And as you can see, Java Lang number format exception for input string minus minus 16 would be the message Such. So, yeah, as you can see, in this case, you could have the opportunity to make something. And you could make an default value. If you want to.

Yeah, to convert a number and it isn't possible, maybe you will continue with some default value. Or you may ask the user again to type in the number again, or you have all opportunities, as you know, but as I said, you don't have to use try catch because number format exception is an unchecked exception. This is how you can convert a string into an int or to an integer. And I would say let's continue with the second question.