Re: generic ArrayList
On May 19, 11:34 pm, Tom Hawtin <use...@tackline.plus.com> wrote:
Jowita wrote:
I cannot compile the above, this is the method I get:
test.java:7: '(' or '[' expected
ArrayList<String> arString = new ArrayList<String>();
I installed the latest Java SE 6.
To check which version of Java you are really using put -J-showversion
on the command line (-J just tells the javac wrapper to pass the
argument onto java, and you can look the java options up in the
documentation).
Presumably you have a problem with your PATH variable (or equivalent).
You need to install the whole JRE, not just the JDK.
In terms of style: Indent correctly. Class names should have initial
caps. Open brace should have a space before it. Using use interface
types (List) in place of implementation types. Do not attempt to prefix
variable names with type information (ar, use the plural of whatever you
have for a collection).
I t may seem trivial, but it will help anyone used to read Java to help
you, and also help you to read conventional Java.
Tom Hawtin
No problem here either. I copied the code right into Eclipse running
under jdk1.6.0 on windows xp professional.
I changed the blah method to public static void main so that I could
see what it was doing without having to create
another class to test it.
import java.util.*;
public class ArrayListTest{
public static void main (String [] args){
ArrayList<String> arString = new ArrayList<String>();
String s1 = "testing";
arString.add(s1);
String s = arString.get(0);
System.out.println(s);
}
}
testing