Integer[] A = {1,2,3,4}
Integer[] B = {1,3,7,9,11}
List<Integer> listA = Arrays.asList(A)
List<Integer> listB = Arrays.asList(B)
List<Integer> jiaoji = new ArrayList<Integer>()
for(Integer a:listA){
if(listB.contains(a)){
jiaoji.add(a)
}
}
System.out.println(jiaoji)
List<Integer> bingji = new ArrayList<Integer>()
for(Integer a:listA){
if(!bingji.contains(a)){
bingji.add(a)
}
}
for(Integer b:listB){
if(!bingji.contains(b)){
bingji.add(b)
}
}
System.out.println(bingji)
List<Integer> chaji = new ArrayList<Integer>()
for(Integer a:listA){
if(!listB.contains(a)){
chaji.add(a)
}
}
System.out.println(chaji)
}
public static void main(String[] args) {Set<Character>result = new HashSet<Character>()
Set<Character>set1 = new HashSet<Character>() {
{
add('a')
add('b')
add('c')
add('d')
add('e')
}
}
Set<Character>set2 = new HashSet<Character>() {
{
add('a')
add('b')
add('c')
}
}
result.clear()
result.addAll(set1)
result.retainAll(set2)
System.out.println("交集:" + result)
result.clear()
result.addAll(set1)
result.removeAll(set2)
System.out.println("差集:" + result)
result.clear()
result.addAll(set1)
result.addAll(set2)
System.out.println("并集:" + result)
result.clear()
result.addAll(set1)
if(result.containsAll(set2)){
result.removeAll(set2)
System.out.println("补集:"+result)
}else{
System.out.println("无补集")
}
}
ArrayList里放的是引用,修改完不用再add一次。
import java.util.ArrayListpublic class Test {
public static void main(final String[] args) {
final Student s1 = new Student("张三", "2018120018", "创智181", "男", 20, "19981218", "中国", "创新创业学院")
final Student s2 = new Student("李四", "2018120011", "创智181", "男", 19, "19990810", "中国", "创新创业学院")
final Student s3 = new Student("王五", "2018120068", "创智181", "男", 18, "20001113", "中国", "计算机学院")
final Student s4 = new Student("赵六", "2018120078", "创智181", "男", 16, "20010506", "中国", "计算机学院")
System.out.println(s1)
System.out.println(s2)
System.out.println(s3)
System.out.println(s4)
System.out.println("-----------")
final ArrayList<Student> arrayList1 = new ArrayList<>()
arrayList1.add(s1)
arrayList1.add(s2)
arrayList1.add(s3)
arrayList1.add(s4)
for (final Student s : arrayList1)
System.out.println(s)
System.out.println("------------")
s1.setAge(15)
s1.setDept("商学院")
System.out.println(s1)
System.out.println("------------")
for (final Student s : arrayList1)
System.out.println(s)
}
}
你没贴Student类,凑合写了一点,仅作演示:
public class Student {private int age
private String dept
private final String name
private final String birthday
public Student(final String name, final String birthday, final String string3, final String string4, final int age,
final String string5, final String string6, final String dept) {
this.name = name
this.birthday = birthday
this.age = age
this.dept = dept
}
public void setAge(final int i) {
this.age = i
}
public void setDept(final String dept) {
this.dept = dept
}
@Override
public String toString() {
return String.format("[%s %s %d %s]", name, birthday, age, dept)
}
}
运行结果:
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