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:

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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

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

works fine, but

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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?

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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:

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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: 836 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?

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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 ^_^

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Programming Forums > Application Development > Java

Java array functions?