For People That's New to Java!

[Alerhau]

Hi everyone! I have some stuff for new people in Java! If you need some tutorials, check out mine and I promise that you'll learn java on about 4 months if you're active! :) Enjoy! My Channel

Why do I do this? Because I love to help people! So this is just for helping new people out! :)

Alerhau

[Fubarable]

Moderation: Moved from "New to Java" forum.

[pbrockway2]

I hope you don't mind a little nitpick...

int i = 20;
System.out.println(i++); // displays "20"

At 3:48 we're told "that's because first of all it prints it out on the screen. After that it makes it one higher."

In fact the expression "i++" does something and it has a value. What it does is make the value of i one higher (it increments the value), and the value the expression "i++" has is the value of i before the increment happened. So the order of things is not (1) print i (2) make i one higher. Rather it is (1) make i one higher (2) print the value of i++, ie print 20.

In more complicated examples forgetting the distinction between what the expression does when it is evaluated and the value it has as a result of that evaluation can lead to trouble.

Details (because it's always good to know *more* than you want to explain...) in the Java Language Specification: 15.14.12 (Postfix Increment Operator). Sorry about the weird link, the links reported by google to Oracle's site are mostly stale. Well done, Oracle!

[sunde887]

I believe this code snippet works similar to that of postfix increment. Correct me if I'm wrong.

public class Ex{
  private int x;
  public int postfixInc(){
    int newInt = x;
    x += 1;
    return newInt;
  }
}

[Alerhau]

I hope you don't mind a little nitpick...

int i = 20;
System.out.println(i++); // displays "20"

At 3:48 we're told "that's because first of all it prints it out on the screen. After that it makes it one higher."

In fact the expression "i++" does something and it has a value. What it does is make the value of i one higher (it increments the value), and the value the expression "i++" has is the value of i before the increment happened. So the order of things is not (1) print i (2) make i one higher. Rather it is (1) make i one higher (2) print the value of i++, ie print 20.

In more complicated examples forgetting the distinction between what the expression does when it is evaluated and the value it has as a result of that evaluation can lead to trouble.

Details (because it's always good to know *more* than you want to explain...) in the Java Language Specification: 15.14.12 (Postfix Increment Operator). Sorry about the weird link, the links reported by google to Oracle's site are mostly stale. Well done, Oracle!

I actually tried to note this. I will put up some comments if it was difficult to understand! :)

[popeyito18]

I'm new to Java, everything helps right now!
Thanks for taking the time to do some videos.

[aviolently]

welcome to java....i just joined moment ago cause i forgot my old account ^^! welcome!