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The Java Developers Almanac 1.4Order this book from Amazon. |
e353. Operating on SetsSee also e352 Creating a Set.// Create the sets Set set1 = new HashSet(); Set set2 = new HashSet(); // Add elements to the sets ... // Copy all the elements from set2 to set1 (set1 += set2) // set1 becomes the union of set1 and set2 set1.addAll(set2); // Remove all the elements in set1 from set2 (set1 -= set2) // set1 becomes the asymmetric difference of set1 and set2 set1.removeAll(set2); // Get the intersection of set1 and set2 // set1 becomes the intersection of set1 and set2 set1.retainAll(set2); // Remove all elements from a set set1.clear();
e354. Creating a Set That Retains Order-of-Insertion
© 2002 Addison-Wesley. |