Java Collection - 001 集合的遍历

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.java.domain.Student;

/**
 * ArrayList 对自定义对象的遍历方法
 * @author jli31 *
 * ArrayList存储字符串并遍历，要求加入泛型，并用增强for遍历
 * 遍历方式：
 * A: 迭代器： Iterator i = list.iterator()
 * B: 普通for循环
 *          for (int i = 0; i<list.size(); i++)  list.get(i)
 *          for (Iterator i = list.iterator(); i.hasNext();)
 * C: 增强for玄幻
 *          for (String s : list)
 *
 * LinkedList, Vector, Collection, List 等存储遍历是完全一样的。
 */

publicclass ArrayListStudentTraversal {

      publicstaticvoid main(String[] args){
            //创建集合对象
            List<Student> studentList = new ArrayList<Student>();

            //创建自定义对象
            Student s1 = new Student(001, "李紫瑶", 1, 0);
            Student s2 = new Student(002, "Ivy", 27, 6000);
            Student s3 = new Student(003, "Ethan", 28, 10232);

            // 添加对象到集合
            studentList.add(s1);
            studentList.add(s2);
            studentList.add(s3);

            // 遍历集合 while + 迭代器
            Iterator<Student> it = studentList.iterator();
            System.out.println("**************** while -- Iterator**************");
            while(it.hasNext()){
                  Student s = it.next();
                  System.out.println(s);
            }
            // 遍历集合 for 循环 + 迭代器
            System.out.println("**************** for -- Iterator**************");
            for(Iterator<Student> it1 = studentList.iterator(); it1.hasNext();){
                  Student s = it1.next();
                  System.out.println(s);
            }
            // 遍历集合 for 循环
            System.out.println("**************** for **************");
            for(inti = 0; i<studentList.size(); i++){
                  Student s = studentList.get(i);
                  System.out.println(s);
            }
            // 遍历集合  增强for
            System.out.println("**************** 增强for **************");
            for(Student s: studentList){
                  System.out.println(s);
            }
      }
}