importjava.util.ArrayList;importjava.util.Collections;importjava.util.Comparator;publicclassDemo02{publicstaticvoidmain(String[] args){ ArrayList<Student> arrayList =newArrayList<>(); arrayList.add(newStudent("aaa",19)); arrayList.add(newStudent("bbb",16)); arrayList.add(newStudent("ccc",20));...
//创建ArrayList studentList =newArrayList();//添加studentList.Add(newStudent { StudentNo ="01", RealName ="学生01"}); studentList.Add(newStudent { StudentNo ="02", RealName ="学生02"}); studentList.Add(newStudent { StudentNo ="03", RealName ="学生03"});//读取Student target = (...
学生dao 类 (dao datebase access object) public class StudentDao { private ArrayList<Student>list = new ArrayList<>(); //增 public void addStu(String sid, String name, String age, String address) { Student stu = new Student(sid, name, age, address); list.add(stu); System.out.println...
ArrayList<students> array = new ArrayList<students>()，是指定了存放的类型，里面只能放students对象，否则会异常。ArrayList array = new ArrayList() 可以放不但可以放students，还可以放其他对象！！
public class StudentManager { 1. //搭建列表 1. public static void main(String[] args) { 1. Scanner sc = new Scanner(System.in); 1. ArrayList<Student> list = new ArrayList<>(); 1. 1. l: 1. while (true) { 1. System.out.println("---学生管理系统---"); 1. System.out....
public class TestArrayList{ public static void main(String[] args) { // 创建集合 ArrayList<String> array = new ArrayList<String>(); // 添加元素 array.add("hello"); array.add("world"); array.add("java"); // public boolean remove(Object o):删除指定的元素,返回删除是否成功 ...
你说的两个都没错.实例化出来的就是实体类.由于List是个集合类 所以它也是一个可以存放Student 实体类对象的集合 ArrayList底层本来就是用数组实现的
ArrayList<Student> students = new ArrayList<>();students.add(new Student("Alice", 18, "Female", "Freshman"));students.add(new Student("Bob", 19, "Male", "Sophomore"));students.add(new Student("Charlie", 20, "Male", "Junior"));students.add(new Student("Diana", 21, "...
nextInt(100); list.add(x); } return list; } public static ArrayList<Integer> countScore(ArrayList<Integer> scoreList){ ArrayList<Integer> countList=new ArrayList<>(); int count100=0; int count79=0; int count59=0; int count39=0; for (int i = 0; i < scoreList.size(); i++) ...
System.out.println(list.get(i));}}存储基本数据类型对象添加到集合案例自定义3个学生对象,添加到集合,并遍历public class Test {public static void main(String[] args) {//创建集合对象ArrayList<Student> list = new ArrayList<Student>();//创建学生对象Student s1 = new Student("赵五",17);Student ...