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import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class CollectionTest {
public static void main(String[] args) {
Set<Integer> set1 = new HashSet<Integer>() {
{
add(1);
add(3);
add(5);
}
};
Set<Integer> set2 = new HashSet<Integer>() {
{
add(1);
add(2);
add(3);
}
};
Set<Integer> result = new HashSet<>();
result.addAll(set1);
System.out.println("set1：" + set1);
System.out.println("set2：" + set2);
result.retainAll(set2);
System.out.println("set1与set2的交集是: " + result);
result.clear();
result.addAll(set2);
result.removeAll(set1);
System.out.println("set2与set1的差集是: " + result);
result.clear();
result.addAll(set1);
result.addAll(set2);
System.out.println("set1和set2的并集: " + result);
System.out.println("set集合并集，是去重复的");
List<Integer> list1 = new ArrayList<Integer>() {{
add(1);
add(3);
add(5);
}};
List<Integer> list2 = new ArrayList<Integer>() {
{
add(1);
add(2);
add(3);
}
};
List<Integer> list = new ArrayList<>();
list.addAll(list1);
System.out.println("list1: " + list1);
System.out.println("list2: " + list2);
list.retainAll(list2);
System.out.println("list1与list2的交集是: " + list);
list.clear();
list.addAll(list2);
list.removeAll(list1);
System.out.println("list2与list1的差集是：" + list);
list.clear();
list.addAll(list1);
list.addAll(list2);
System.out.println("list1和list2的并集: " + list);
System.out.println("List集合并集, 是不去重复的");
}
}
set1：[1, 3, 5]
set2：[1, 2, 3]
set1与set2的交集是: [1, 3]
set2与set1的差集是: [2]
set1和set2的并集: [1, 2, 3, 5]
set集合并集，是去重复的
list1: [1, 3, 5]
list2: [1, 2, 3]
list1与list2的交集是: [1, 3]
list2与list1的差集是：[2]
list1和list2的并集: [1, 3, 5, 1, 2, 3]
List集合并集, 是不去重复的
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