e353. operating on sets.txt

这里面包含了一百多个JAVA源文件

See 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();

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