core-java学习【二】

package com;

import java.util.*;

public class ArrayListTest
{
    public static void main(String[] args) 
    {
        // fill the staff array list with three Employee objects
        // 声明和构造一个保存Employee对象的数组列表
        ArrayList<Employee> staff = new ArrayList<Employee> () ;
        
        Employee temp1 = new Employee("Eric", "Zhang", 80000, 1989, 3, 14) ;
        Employee temp2 = new Employee("Huiyi", "Chen", 80000, 1989, 3, 14) ;
        
        staff.add(new Employee("Carl", "Cracker", 75000, 1987, 12, 15)) ;
        staff.add(new Employee("Harry", "Hacker", 50000, 1989, 10, 1)) ;
        staff.add(new Employee("Tony", "Tester", 40000, 1990, 3, 15)) ;
        staff.add(temp2) ;
        
        //使用add方法将对象添加到列表的指定位置，而不会覆盖原值，原有值会自动往下移动一格
        staff.add(0 , temp1) ;
        
        //使用set方法将对象添加到列表的指定位置，会覆盖原值
        staff.set(4 , temp2) ;
        
        // 使用remove方法将指定位置的对象从列表中删除，其后的对象将自动往上移一个同时调整列表大小
        staff.remove(3) ;
        
        // 方法 size()返回当前列表中元素的个数
        System.out.println("\nstaff.size()= " + staff.size() + "\n");
        
        // raise everyone's salary by 5%
        for(Employee e : staff)
            e.raiseSalary(5) ;
        /* 等同于如下for循环
         * for (int i = 0; i < staff.size(); i++)
         *  {
         *        Employee e = (Employee)staff.get(i) ;
         *        e.raiseSalary(5);
         *       }
         */
                
        // print out the information about all Employee objects
        for(Employee e : staff)
            System.out.println("Name= " + e.getName()
                    + " , salary= " + e.getSalary()
                    +" , hireDay= " + e.getHireDay()) ;
    }
}