ArrayList



四 ArrayList

ArrayList<String>stringList=new ArrayList<String>();

add 加

remove 删

 ArrayList就是传说中的动态数组，用MSDN中的说法，就是Array的复杂版本，它提供了如下一些好处：

1. 动态的增加和减少元素
2. 实现了ICollection和IList接口
3. 灵活的设置数组的大小
5. List<Person> list = new List<Person>(4);
6.           
7.             list.Add(p1);
8.             list.Add(p2);
9.             list.Add(p3);

package dome1;

public class Student {

       private String name;

       private String gender;

       private int grade;

       /**

        *

        * @param name

        * @param gender

        * @param grade

        */

       public Student(String name,String gender,int grade){

             this.name=name;

             this.gender=gender;

             this.grade=grade;

             

       }

       

       public String getName() {

             return name;

       }

       public void setName(String name) {

             this.name = name;

       }

       public String getGender() {

             return gender;

       }

       public void setGender(String gender) {

             this.gender = gender;

       }

       public int getGrade() {

             return grade;

       }

       public void setGrade(int grade) {

             this.grade = grade;

       }

       

}

package dome1test;

import java.util.ArrayList;

import dome1.Student;

public class Test {

    public static void main(String[] args) {

        ArrayList <Student> studentList=new ArrayList<Student>();

        //创建student对象

        Student s1=new Student("王","女",38);

        Student s2=new Student("王1","女",38);

        Student s3=new Student("王2","女",38);

        Student s4=new Student("王3","女",38);

        Student s5=new Student("王4","女",38);

        Student s6=new Student("王5","女",38);

        Student s7=new Student("王6","女",38);

        Student s8=new Student("王7","女",38);

        Student s9=new Student("王8","女",38);

        Student s10=new Student("王9","女",38);

        Student s11=new Student("王大","女",38);

        studentList.add(s1);

        studentList.add(s2);

        studentList.add(s3);

        studentList.add(s4);

        studentList.add(s5);

        studentList.add(s6);

        studentList.add(s7);

        studentList.add(s8);

        studentList.add(s9);

        studentList.add(s10);

        studentList.add(s11);

        for(int i=0;i<studentList.size();i++){

            Student s= studentList.get(i);

            System.out.println(s.getGender()+"  "+s.getName());

        }

        for (Student student : studentList) {

            System.out.println(student.getName()+"  "+student.getGender());

        }   

    }

}