java练习——ArrayList

//定义学生类

public class Student {
   private String name;
   public Student(String name){
	   this.name = name;
   }
   public String toString(){
	   return name;
   }
}

import java.util.*;
public class StudentTest {
   public static void main(String args[]){
	   Student WangLi = new Student("WangLi");//创建学生对象
	   Student SunChao = new Student("SunChao");
	   Student WangXiaohui = new Student("WangXiaohui");
	   List studentList = new ArrayList();//创建ArrayList对象，调用add方法存储学生对象
	   studentList.add(WangLi);
	   studentList.add(SunChao);
	   studentList.add(WangXiaohui);
	   System.out.println("学生数量为："+studentList.size());//调用size方法获得学生数量
	   int i;

            for(i = 0;i<studentList.size();i++){//循环调用get方法取出学生对象，逐条打印学生信息

		   Student student = (Student)studentList.get(i);//从集合中取出后为Object类型，需要进行强制类型转换
		   System.out.println(student.toString());
	   }
	   
   }
}