Introduction to Arrays

I just learned Arrays and I thought I would share some basics
You must have knowledge on Variables
Arrays are fun

Code:

class Arrays {
	public static void main(String[] args) {
		
		int[] Arrays; //I've declared an Array of integers which is defined by the []
		Arrays = new int[5]; //I've just created space for an Array that holds 5 integers
			
			Arrays[0] = 0;  //declaring each array
			Arrays[1] = 1;  //remember that it starts at 0 and not 1
			Arrays[2] = 2;
			Arrays[3] = 3;
			Arrays[4] = 4;
			
		System.out.println("This is number: " + Arrays[0]);
		System.out.println("This is number: " + Arrays[1]);
		System.out.println("This is number: " + Arrays[2]);
		System.out.println("This is number: " + Arrays[3]);
		System.out.println("This is number: " + Arrays[4]);
		
		}
		
	}

Output:

This is number: 0
This is number: 1
This is number: 2
This is number: 3
This is number: 4

 

Why not declare the array in an easier way and also use a for-loop to go through all of the values?

Code:

class Arrays {

    public static void main(String[] args) {
	int[] array = {
		0, 1, 2, 3, 4
	};
	for(int i : array) {
		System.out.println("This is number: " + Integer.toString(i));
	}
    }
}

Also, it's a single array, so "Arrays" wouldn't be a very good choice for a variable name.

Overall, decent tut. Things could have been done a bit easier, but it's an intro, so..yeah

 

Well since that's the case and it is an intro you should have used a regular for loop instead of the for each syntax.

 

Doesn't make a very big difference imo, but w/e

Code:

for(int i=0; i<array.length; i++) {
        int x = array[i];
        System.out.println("This is number: " + x);
}

 

lol this has nothing to do with loops
this is the standard way of doing it, and I like my way better, a lot cleaner and looks better
I like having good format

 

The standard way for going through all the elements of an array is to go through each element manually? That almost defeats the whole purpose of an array.

Think about if you had 15 elements in the array. For my code, all you could have to do is add those elements into the array, and that's all. For your code, You would need to add 30 more lines of code that make the vast majority of the program bulky and unnecessary.

 

what do you know about that? I thought you just learned arrays ^^

the "standard" way of doing it is with loops, preferably a for-each loop as Jimmy said...
A good rule of thumb (imo): three-four iterations or more, then use a loop

 

I find his nomenclature slightly amusing.

He's calling a single array "arrays" and he's calling each integer element an array.

But yes, loops are the standard way of initializing arrays and / or displaying their data. It's just common sense.

 

I have a question. How do you put mathematical operation in an array type?
Like example.

array[0] + array[1] = sum

Can you please give me syntax?

Oh, and one more question. How do you return the value of an array?

 

int sum = array[0] + array[1];

If by return the value, you mean get the value of all the elements in the array when added to each other, then

Code:

int sum=0;
for(int x : array) {
    sum += x;
}

at the end of the for-loop, sum will have the value of all the elements in the array added together.

 

kuld just use a bubble sort ;

Code:

int[] sorted = new int[5]; int compare; for(int x = 0; x< 5; x++) { compare = number[x]; for(int y = 0; y<5; y++){if(compare > number[y]){compare=number[y];} sorted[x] = compare;} }

 

I would help, but I "dnt lyk how u tyP," plus, the fact that you can't even be bothered to put your code in

Code:

 tags makes me assume that you don't care too about getting help.

 

My mistake- it's just that your English is so unreadable I mistook a statement for a question.

A suggestion: Type in proper English so that people are not completely confused while reading what you've typed.

 

u. dun. luk. clever. bi. puttin. a. fukin. ful. stop. after. evry. werd.

"Rofl, Excuse me? I talk like this because it makes me look more intelligent" - ye datz guna make me giv a shit

 

Quit being hard on him guys.

Some newbs would be even more confused if there was a loop in there. The example demonstrates an array just fine.

 

for-each would be slightly faster. the following code would produce the same instructions as the for-each:

Code:

int[] ax = array;
int len = ax.length;
for (int i = 0; i < len; ++i) {
    int x = ax[i];
    System.out.println("This is number: " + x);
}

Notice the length caching.

 

How come a for-each would be slightly faster, super_?

 

I tested the times and the normal one was about 20ms faster when it looped through it 1000 times.... >_>.

 

It is probably the declaration of variables? Which comes first. In where the first one will have to read .length over and over until the loop has ended?