package com.imooc.collection;import java.util.ArrayList;import java.util.Arrays;import java.util.List;?public class ListTest { /** * 用于存放備選課程List */?public List coursesToSelect;//課程屬性?public ListTest(){ this.coursesToSelect=new ArrayList();?}?/**? * 用于往coursesToSelect中添加備選課程? */? public void testAdd(){ ?//創(chuàng)建一個課程對象，并通過調用add方法，添加到備選課程中l(wèi)ist去 ?Course cr1=new Course("1","數據類型"); ?coursesToSelect.add(cr1); ?Course temp=(Course) coursesToSelect.get(0);//這是看是否插入進去了，提出來的用get方法 ?System.out.println("添加了課程"+temp.id+":"+temp.name); ?Course cr2=new Course("2","c語言"); ?coursesToSelect.add(0, cr2); ? ?Course temp2=(Course) coursesToSelect.get(0); ?//存入忽略原來類型只當是object,取出也是object,所以要強轉成課程類型? ?System.out.println("添加了課程"+temp2.id+":"+temp2.name);? ?//這次是用數組的方法添加，再把數組轉化成列表，的addall方式? ?Course[] course={new Course("3","離散數學"),new Course("4","匯編語言")};? }? coursesToSelect.addAll(Arrays.aslist(course));? //Course temp3 = (Course)coursesToSelect.get(3);? //Course temp4 = (Course)coursesToSelect.get(4);? public static void main(String[] args) { ListTest It=new ListTest(); It.testAdd();}}