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package Sets;   
import java.util.HashSet;   
import java.util.Iterator;   
import java.util.Set;   
import java.util.TreeSet;   
  
/**  
 * java¼¯ºÏ²Ù×÷  
 *   
 * @author baby69yy2000  
 *   
 */  
public class Sets {   
  
    /** Çó²¢¼¯ */  
    public static <T> Set<T> union(Set<T> setA, Set<T> setB) {   
        Set<T> setUnion;   
  
        if (setA instanceof TreeSet)   
            setUnion = new TreeSet<T>();   
        else  
            setUnion = new HashSet<T>();   
  
        Iterator<T> iterA = setA.iterator();   
        while (iterA.hasNext())   
            setUnion.add(iterA.next());   
  
        Iterator<T> iterB = setB.iterator();   
        while (iterB.hasNext())   
            setUnion.add(iterB.next());   
        return setUnion;   
   &n


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