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Sets.java
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32 lines (31 loc) · 911 Bytes
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// onjava/Sets.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
package onjava;
import java.util.*;
public class Sets {
public static <T> Set<T> union(Set<T> a, Set<T> b) {
Set<T> result = new HashSet<>(a);
result.addAll(b);
return result;
}
public static <T>
Set<T> intersection(Set<T> a, Set<T> b) {
Set<T> result = new HashSet<>(a);
result.retainAll(b);
return result;
}
// Subtract subset from superset:
public static <T> Set<T>
difference(Set<T> superset, Set<T> subset) {
Set<T> result = new HashSet<>(superset);
result.removeAll(subset);
return result;
}
// Reflexive--everything not in the intersection:
public static
<T> Set<T> complement(Set<T> a, Set<T> b) {
return difference(union(a, b), intersection(a, b));
}
}