Programming Forums > Application Development > Java

andro · Dec 1st, 2005, 11:25 PM

Quote:

Originally Posted by titaniumdecoy

No, one is a basic data type and the other is an object.

Yes, but in the context of ArrayList, you cannot specify <int>. You must use <Integer>. You may then use it as a int.

Such as:

(Toggle Plain Text)

myArray.add(5);

if (myArray.get(0) == 5) {
    System.out.println("Yep, it was 5");
}

titaniumdecoy · Dec 1st, 2005, 11:50 PM

Ok... how come

(Toggle Plain Text)

ArrayList[][] possible = new ArrayList[9][9];

works fine, but

(Toggle Plain Text)

ArrayList<Byte>[][] possible = new ArrayList<Byte>[9][9];

doesn't? They seem like the same thing to me.

groovicus · Dec 2nd, 2005, 7:15 AM

Shouldn't it be declared like this?

(Toggle Plain Text)

ArrayList<Byte>[][] possible = new ArrayList[9][9];

Master · Dec 2nd, 2005, 7:25 AM

you have to declare it with <> because ArrayList is a template class which allow you to create ArrayList of any data type. I hope i am not wrong ^_^

Writlaus · Dec 2nd, 2005, 1:37 PM

I had to declare my ArrayList like this:

(Toggle Plain Text)

ArrayList<MyPoint> points=new ArrayList<MyPoint>();

But my situation could be different, since I'm using my own object and I'm creating an empty, one-dimensional ArrayList. I'm not sure if that changes anything...

2roll4life7 · Dec 3rd, 2005, 11:39 AM

Or you can go oldschool 1.4.2 and don't use the template. Then you could just declare an ArrayList object and add new Integer objects too it (called a wrapper class).

Dec 1st, 2005, 11:50 PM	#22
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 837 Rep Power: 3	Ok... how come (Toggle Plain Text) ArrayList[][] possible = new ArrayList[9][9]; ArrayList[][] possible = new ArrayList[9][9]; works fine, but (Toggle Plain Text) ArrayList<Byte>[][] possible = new ArrayList<Byte>[9][9]; ArrayList<Byte>[][] possible = new ArrayList<Byte>[9][9]; doesn't? They seem like the same thing to me.

Dec 2nd, 2005, 7:15 AM	#23
groovicus Programmer Join Date: Nov 2004 Posts: 84 Rep Power: 4	Shouldn't it be declared like this? (Toggle Plain Text) ArrayList<Byte>[][] possible = new ArrayList[9][9]; ArrayList<Byte>[][] possible = new ArrayList[9][9]; __________________ HijackThis Team-SFDC

Dec 2nd, 2005, 1:37 PM	#25
Writlaus Hobbyist Programmer Join Date: Nov 2005 Posts: 149 Rep Power: 3	I had to declare my ArrayList like this: (Toggle Plain Text) ArrayList<MyPoint> points=new ArrayList<MyPoint>(); ArrayList<MyPoint> points=new ArrayList<MyPoint>(); But my situation could be different, since I'm using my own object and I'm creating an empty, one-dimensional ArrayList. I'm not sure if that changes anything...

Dec 3rd, 2005, 11:39 AM	#26
2roll4life7 Programmer Join Date: Aug 2005 Location: 0x0010 * 0x0091 + 0x0004 Posts: 65 Rep Power: 3	Or you can go oldschool 1.4.2 and don't use the template. Then you could just declare an ArrayList object and add new Integer objects too it (called a wrapper class). __________________ (Toggle Plain Text) #if 0 /* in case someone actually tries to compile this / #if 0 / in case someone actually tries to compile this */ - libpng version 1.2.8 (example.c) <Jim_McNeat> Is there like a way to put a compiler in "Just trust me on that one" mode?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Dec 2nd, 2005, 7:25 AM	#24
Master Programmer Join Date: Sep 2005 Location: GA Posts: 99 Rep Power: 3	you have to declare it with <> because ArrayList is a template class which allow you to create ArrayList of any data type. I hope i am not wrong ^_^

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Programming Forums > Application Development > Java

Java array functions?