Mega Code Archive
Things you can do with Sets
<![CDATA[
// : c11:Set1.java
// Things you can do with Sets.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;
public class Set1 {
static void fill(Set s) {
s.addAll(Arrays.asList("one two three four five six seven".split(" ")));
}
public static void test(Set s) {
// Strip qualifiers from class name:
System.out.println(s.getClass().getName().replaceAll("\\w+\\.", ""));
fill(s);
fill(s);
fill(s);
System.out.println(s); // No duplicates!
// Add another set to this one:
s.addAll(s);
s.add("one");
s.add("one");
s.add("one");
System.out.println(s);
// Look something up:
System.out.println("s.contains(\"one\"): " + s.contains("one"));
}
public static void main(String[] args) {
test(new HashSet());
test(new TreeSet());
test(new LinkedHashSet());
}
} ///:~
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