[英]LinkedList with intersection and union
我有兩個列表,都添加了整數。 我想將兩個列表和聯合相交。 我有我的代碼,但是由於某種原因它無法編譯。
關於為什么我不能簡單地LinkedList.intersection(argument, argument)
任何建議?
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;
public class IntegerSet
{
public static void main(String args[]) {
LinkedList<Double> list1 = new LinkedList<Double>();
list1.add((double) 5);
list1.add((double) 15);
list1.add((double) 3);
list1.add((double) 15);
LinkedList<Double> list2 = new LinkedList<Double>();
list2.add((double) 15);
list2.add((double) 8);
list2.add((double) 16);
list2.add((double) 11);
// Calculating Intersection of two Set in Java
LinkedList<Double> intersection = LinkedList.intersection(list1, list2);
System.out.printf("Intersection of two Set %s and %s in Java is %s %n",
list1.toString(), list2.toString(), intersection.toString());
System.err.println("Number of elements common in two Set : "
+ intersection.size());
// Calculating Union of two Set in Java
LinkedList<Double> union = LinkedList.union(list1, list2);
System.out.printf("Union of two Set %s and %s in Java is %s %n",
list1.toString(), list2.toString(), union.toString());
System.out.println("total number of element in union of two Set is : "
+ union.size());
}
}
除了要在linked list
上使用intersection
和並union
方法之外,就復雜性而言,這是最糟糕的事情之一。 也,
// Calculating Union of two Set in Java
LinkedList<Double> union = LinkedList.union(list1, list2);
Set
與List
。 API中還存在以下內容:
col.retainAll(otherCol) // for intersection
col.addAll(otherCol) // for union
另請參閱這篇文章: Java中ArrayList的交集和並集
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