设置差()函数|番石榴| Java
原文:https://www . geesforgeks . org/set-difference-function-guava-Java/
番石榴的set . difference()返回两个 set 之差的 不可修改视图 。
语法:
public static <E>
Sets.SetView<E>
difference(Set<E> set1,
Set<?> set2)
返回值:该方法返回一个集合，该集合包含集合 1 包含的所有元素，集合 2 不包含所有元素。
注意: Set2 也可能包含 set1 中不存在的元素，这些被简单忽略。返回集合的迭代顺序与集合 1 的迭代顺序相匹配。
例 1:
// Java code to show implementation of
// Guava's Sets.difference() 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 named set1
Set<Integer>
set1 = Sets.newHashSet(1, 2, 3, 4, 5, 6);
// Creating second set named set2
Set<Integer>
set2 = Sets.newHashSet(1, 3, 5, 7);
// Using Guava's Sets.difference() method
Set<Integer>
diff = Sets.difference(set1, set2);
// Displaying the unmodifiable view of
// the difference of two sets.
System.out.println("Set 1: "
+ set1);
System.out.println("Set 2: "
+ set2);
System.out.println("Difference between "
+ "Set 1 and Set 2: "
+ diff);
}
}
Output:
Set 1: [1, 2, 3, 4, 5, 6]
Set 2: [1, 3, 5, 7]
Difference between Set 1 and Set 2: [2, 4, 6]
例 2 :
// Java code to show implementation of
// Guava's Sets.difference() 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 named set1
Set<String>
set1 = Sets
.newHashSet("H", "E", "L", "L", "O", "G");
// Creating second set named set2
Set<String>
set2 = Sets
.newHashSet("L", "I", "K", "E", "G");
// Using Guava's Sets.difference() method
Set<String>
diff = Sets.difference(set1, set2);
// Displaying the unmodifiable view of
// the difference of two sets.
System.out.println("Set 1: "
+ set1);
System.out.println("Set 2: "
+ set2);
System.out.println("Difference between "
+ "Set 1 and Set 2: "
+ diff);
}
}
Output:
Set 1: [E, G, H, L, O]
Set 2: [I, K, L, E, G]
Difference between Set 1 and Set 2: [H, O]
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