设置 union()函数|番石榴| Java
原文:https://www . geesforgeks . org/set-union-function-guava-Java/
番石榴的set . union()返回两个集合并集的 不可修改视图 。返回的集合包含任一支持集合中包含的所有元素。迭代返回的集合首先迭代集合 1 的所有元素，然后依次迭代集合 2 中不包含在集合 1 中的每个元素。
语法:
public static <E>
Sets.SetView<E>
union(Set<? extends E> set1,
Set<? extends E> set2)
返回值:这个方法返回两个集合并集的不可修改的视图。
例 1:
// Java code to show implementation
// of Guava's Sets.union() method
import com.google.common.collect.Sets;
import java.util.Set;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating first set
Set<Integer>
set1 = Sets.newHashSet(1, 2, 3, 4, 5);
// Creating second set
Set<Integer>
set2 = Sets.newHashSet(3, 5, 7, 9);
// Using Guava's Sets.union() method
Set<Integer>
answer = Sets.union(set1, set2);
// Displaying the union of set set1 and set2
System.out.println("Set 1: "
+ set1);
System.out.println("Set 2: "
+ set2);
System.out.println("Set 1 union Set 2: "
+ answer);
}
}
Output:
Set 1: [1, 2, 3, 4, 5]
Set 2: [9, 3, 5, 7]
Set 1 union Set 2: [1, 2, 3, 4, 5, 9, 7]
例 2:
// Java code to show implementation
// of Guava's Sets.union() method
import com.google.common.collect.Sets;
import java.util.Set;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating first set
Set<String>
set1 = Sets.newHashSet("G", "e", "e", "k", "s");
// Creating second set
Set<String>
set2 = Sets.newHashSet("g", "f", "G", "e");
// Using Guava's Sets.union() method
Set<String>
answer = Sets.union(set1, set2);
// Displaying the union of set set1 and set2
System.out.println("Set 1: "
+ set1);
System.out.println("Set 2: "
+ set2);
System.out.println("Set 1 union Set 2: "
+ answer);
}
}
Output:
Set 1: [k, s, e, G]
Set 2: [e, f, g, G]
Set 1 union Set 2: [k, s, e, G, f, g]
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