JAVAutil。收藏。java中的disjoint（）方法及其示例-yiteyi-C++库

JAVAutil。收藏。不相交的 方法在java中存在。util。收藏课。用于检查两个指定集合是否不相交。更正式地说，如果两个集合没有共同的元素，那么它们是不相交的。

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Syntax:
public static boolean disjoint(Collection<?> c1, Collection<?> c2)
Parameters : 
c1 - a collection
c2 - a collection
Returns :
true if the two specified collections have no elements in common.
Throws:
NullPointerException - if either collection is null.
NullPointerException - if one collection contains a null element and null is not an eligible 
element for the other collection.
ClassCastException - if one collection contains an element that is of a type which is ineligible
 for the other collection.

请注意，允许在两个参数中传递相同的集合，在这种情况下，方法将返回 当且仅当集合为空时为true。

                     // Java program to demonstrate working of                   
                     // java.utils.Collections.disjoint()                   
                             
                     import                               java.util.*;                   
                             
                     public                               class                               DisjointDemo                   
                     {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Let us create array list of strings                   
                                         List<String>  mylist1 =                               new                               ArrayList<String>();                   
                                         mylist1.add(                               "practice"                               );                   
                                         mylist1.add(                               "code"                               );                   
                                         mylist1.add(                               "quiz"                               );                   
                                         mylist1.add(                               "geeksforgeeks"                               );                   
                             
                                         // Let us create vector of strings                   
                                         List<String>  mylist2 =                               new                               Vector<String>();                   
                                         mylist2.add(                               "geeks"                               );                   
                                         mylist2.add(                               "geek"                               );                   
                                         mylist2.add(                               "for"                               );                   
                                         mylist2.add(                               "coder"                               );                   
                             
                                         // Let us create a vector                   
                                         List mylist3 =                               new                               Vector();                   
                             
                                         mylist3.add(                               1                               );                   
                                         mylist3.add(                               "practice"                               );                   
                             
                                         // Let us create a Set of strings                   
                                         Set<String>  mylist4 =                               new                               HashSet<String>();                   
                                         mylist4.add(                               "practice"                               );                   
                                         mylist4.add(                               "code"                               );                   
                                         mylist4.add(                               "quiz"                               );                   
                                         mylist4.add(                               "geeksforgeeks"                               );                   
                             
                             
                                         // Here we are using disjoint() method to check                   
                                         // whether two collections are disjoint or not                   
                                         System.out.println(                               "is mylist1 disjoint to mylist2 : "                               +                   
                                         Collections.disjoint(mylist1, mylist2));                   
                             
                                         System.out.println(                               "is mylist1 disjoint to mylist3 : "                               +                   
                                         Collections.disjoint(mylist1, mylist3));                   
                             
                                         System.out.println(                               "is mylist1 disjoint to mylist4 : "                               +                   
                                         Collections.disjoint(mylist1, mylist4));                   
                             
                                         }                   
                     }                   

输出：

is mylist1 disjoint to mylist2 : true
is mylist1 disjoint to mylist3 : false
is mylist1 disjoint to mylist4 : false

如何快速检查Java中的两个数组是否不相交？

Java中的数组类没有不相交的方法。我们可以使用集合。disjoint（）快速检查两个数组的不相交性。

                     // Java program to demonstrate disjoint                   
                     // method with arrays                   
                             
                     import                               java.util.*;                   
                             
                     public                               class                               DisjointDemo                   
                     {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Let us create  arrays of integers                   
                                         Integer arr1[] = {                               10                               ,                               20                               ,                               30                               ,                               40                               ,                               50                               };                   
                                         Integer arr2[] = {                               60                               ,                               70                               ,                               80                               ,                               90                               ,                               100                               };                   
                                         Integer arr3[] = {                               50                               ,                               70                               ,                               80                               ,                               90                               ,                               100                               };                   
                                         Double  arr4[] = {                               50.0                               ,                               60.0                               ,                               110.0                               };                   
                             
                             
                                         // Please refer below post for details of asList()                   
                                         //                       https://www.geeksforgeeks.org/array-class-in-java/                              
                                         // Here we are using disjoint() method to check                   
                                         // whether two arrays are disjoint or not                   
                                         System.out.println(                               "is arr1 disjoint to arr2 : "                               +                   
                                         Collections.disjoint(Arrays.asList(arr1), Arrays.asList(arr2)));                   
                             
                                         System.out.println(                               "is arr1 disjoint to arr3 : "                               +                   
                                         Collections.disjoint(Arrays.asList(arr1), Arrays.asList(arr3)));                   
                             
                                         System.out.println(                               "is arr1 disjoint to arr4 : "                               +                   
                                         Collections.disjoint(Arrays.asList(arr1), Arrays.asList(arr4)));                   
                             
                                         }                   
                     }                   

输出：

is arr1 disjoint to arr2 : true
is arr1 disjoint to arr3 : false
is arr1 disjoint to arr4 : true

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