Examples of java.util.Set.retainAll()

java.util.Set.retainAll()
Retains only the elements in this set that are contained in the specified collection (optional operation). In other words, removes from this set all of its elements that are not contained in the specified collection. If the specified collection is also a set, this operation effectively modifies this set so that its value is the intersection of the two sets. @param c collection containing elements to be retained in this set @return true if this set changed as a result of the call @throws UnsupportedOperationException if the retainAll operationis not supported by this set @throws ClassCastException if the class of an element of this setis incompatible with the specified collection (optional) @throws NullPointerException if this set contains a null element and thespecified collection does not permit null elements (optional), or if the specified collection is null @see #remove(Object)

        // We never get to this point if buxfixed is true and any of these stands:
        // - One of classes was a primitive type
        // - One of classes was a numerical type (either boxing type or primitive)
        
        Set commonTypes = _MethodUtil.getAssignables(c1, c2);
        commonTypes.retainAll(_MethodUtil.getAssignables(c2, c1));
        if(commonTypes.isEmpty()) {
            // Can happen when at least one of the arguments is an interface, as
            // they don't have Object at the root of their hierarchy
            return Object.class;
        }

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    private static Method getCallbackMethod(Class cls) {
        // Look at only public methods defined by the Callback class
        Method[] pubMethods = cls.getDeclaredMethods();
        Method[] classMethods = cls.getMethods();
        Set pmethods = new HashSet(Arrays.asList(pubMethods));
        pmethods.retainAll(Arrays.asList(classMethods));


        // Remove Object methods disallowed as callback method names 
        for (Iterator i=pmethods.iterator();i.hasNext();) {
            Method m = (Method)i.next();
            if (Callback.FORBIDDEN_NAMES.contains(m.getName())) {

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  private Set knownEdit2(String word) {
    Set typos = new HashSet();
    for (Iterator itr = typos.iterator(); itr.hasNext();) {
      typos.addAll(edit1(word));
    }
    typos.retainAll(wordFrequency.keySet());
    return typos;
  }


  public static void main(String[] args) throws Exception {
    NaiveBayesianSpellChecker checker = new NaiveBayesianSpellChecker(

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            for (int j = 0; j < intersected.length; j++) {
                Collection arts = getArtifactsIncludingExtending(intersected[j]);
                if (intersectedArtifacts.isEmpty()) {
                    intersectedArtifacts.addAll(arts);
                } else {
                    intersectedArtifacts.retainAll(arts);
                }
            }
            if (artifacts != null) {
                intersectedArtifacts.addAll(artifacts);
            }

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        });
        
        storedUserChecked.addAll(newCheckedUsers);
        
        Set usersUnclicked = new HashSet(storedUserChecked);
        usersUnclicked.retainAll(usersShown);
        usersUnclicked.removeAll(newCheckedUsers);
        storedUserChecked.removeAll(usersUnclicked);
    }


    private User[] searchUsers(String request, Integer from, Integer howMany) {

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            fail("Should have thrown UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            ; // Expected result
        }
        try {
            entrySet.retainAll(mapEntries);
            fail("Should have thrown UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            ; // Expected result
        }

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            fail("Should have thrown UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            ; // Expected result
        }
        try {
            keySet.retainAll(mapKeys);
            fail("Should have thrown UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            ; // Expected result
        }

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            if ("key1".equals(entry.getKey())) {
                list.add(entry);
                break;
            }
        }
        assertTrue(entrySet.retainAll(list));
        assertTrue(sessionMap.size() == 1);
        sessionMap.clear();
        sessionMap.putAll(cloneMap);


        // next validate Iterator.remove goes through to the backing Map.

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            if ("key1".equals(entry.getKey())) {
                list.add(entry);
                break;
            }
        }
        assertTrue(entrySet.retainAll(list));
        assertTrue(requestMap.size() == 1);
        requestMap.clear();
        requestMap.putAll(cloneMap);


        // next validate Iterator.remove goes through to the backing Map.

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        entrySet = facets.entrySet();
        matches = new HashSet();
        matches.add(new TestMapEntry("b", facet2));
        matches.add(new TestMapEntry("d", facet4));
        matches.add(new TestMapEntry("f", facet6));
        entrySet.retainAll(matches);
        assertEquals(2, facets.size());
        assertEquals(2, entrySet.size());
        checkFacetMissing(component, "a", facet1);
        checkFacetPresent(component, "b", facet2);
        checkFacetMissing(component, "c", facet3);

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