[wildcard] Forum Topics

how do I do pattern matching for something like `/^(.*)text/` and `/text(.*)$/`?

List<? extends Integer> list = new ArrayList<Integer>(); for (Integer element : list) { System.out.println(element); List<? super Integer> list = new ArrayList<Integer>(); for (Integer element : list) { System.out.println(element); For the first three lines as Case 1 using extends it compiles fine. But for Case 2 of next three lines, it …

<? super Animal> means animal or it's superclass only. Then why inside the method it's allowing to add Dog object even though it's a subclass of Animal? This program compiles and runs! import java.util.*; class Cat {} class Animal{Animal() {System.out.println("Animal constructor");}} class Dog extends Animal{Dog() {System.out.println("Dog constructor");}} public class GenericDemo5 …

import java.util.*; class SampleA { } class SampleB extends SampleA{ } class SampleC extends SampleA{ } class VectorDemo { public static void main(String r[]) { Vector<SampleA> v = new Vector<SampleA>(); v.add(new SampleB()); v.add(new SampleC()); SampleC rect = v.get(2); } } The output says "Incompatible types. Found SampleA, required SampleC. SampleC …

I am new to this forum. I need help in defining the same kind of function according to my requirements. as [url]http://www.codeproject.com/Articles/1088/Wildcard-string-compare-globbing[/url] I hope, I 'll get good response. Words are strings which are separated by dots. Two additional characters are also valid i.e:The *, which matches 1 word and …

Consider the following code : [CODE]class R2<E> { E a; E get() { return a; } void set(E a) { this.a=a; } } class R3 { void doit(R2 a) // (1) { a.set(new Integer(5)); } }[/CODE] When I compile the file containing class R3, it rightly gives an unchecked warning …