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<TITLE>Operating on Sets
(Java Developers Almanac Example)
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<h3>
e353.
Operating on Sets</h3>
See also <a href="../java.util/coll_Sets.html" class="eglink"><font size="-1"><b>e352</b> Creating a Set</font></a>.
<pre>
// 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();
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Related Examples
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e352. <a class="eglink" href="coll_Sets.html?l=rel">
Creating a Set
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e354. <a class="eglink" href="coll_SetOrder.html?l=rel">
Creating a Set That Retains Order-of-Insertion
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See also:
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Arrays">
Arrays
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Bits">
Bits
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Collections">
Collections
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Dates">
Dates
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Hash%20Tables">
Hash Tables
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Lists">
Lists
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Property%20Files">
Property Files
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sorted%20Collections">
Sorted Collections
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Time">
Time
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Timers">
Timers
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