package com.imooc.collection;import java.util.ArrayList;import java.util.List;/*?*??* ?備選課程類?*/public class ListTest { public List coursesToSelect; /* *? * 用于存放備選課程的List */ 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(gè)課程對(duì)象，并通過調(diào)用add方法，添加到備選課程中 Course cr1 = new Course("1","數(shù)據(jù)結(jié)構(gòu)"); coursesToSelect.add(cr1); Course temp =(Course) coursesToSelect.get(0); 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); System.out.println("添加了課程："+temp2.id+":"+temp2.name); // 以下方法會(huì)拋出數(shù)組下標(biāo)越界異常// Course cr3 = new Course("3","test");// coursesToSelect.add(4,cr3); // 以下為出現(xiàn)錯(cuò)誤，自己不會(huì)調(diào)試過來，"沒有Arrays類" Course[] course = {new Course("3","離散數(shù)學(xué)"),new Course("4","匯編語言")}; coursesToSelect.addAll(Arrays.asList(course)); Course temp3 =(Course) coursesToSelect.get(2); Course temp4 =(Course) coursesToSelect.get(3); System.out.println("添加了兩門課程："+temp3.id+":"+ temp3.name+";"+temp4.id+":"+temp4.name); // 同上問題，百度說是引入包不正常，但是已經(jīng)引入了ArrayList包。 Course[] course2 = {new Course("5","高等數(shù)學(xué)"),new Course("6","匯編語言")}; coursesToSelect.addAll(2,Arrays.asLst(course2)); Course temp5 = (Course) coursesToSelect.get(2); Course temp6 = (Course) coursesToSelect.get(3); System.out.println("添加了兩門課程："+temp5.id+":"+ temp5.name+";"+temp6.id+":"+temp6.name); } public void testGet(){ int size = coursesToSelect.size(); for(int i=0; i<size;i++){ Course cr = (Course) coursesToSelect.get(i); System.out.println("課程"+cr.id+":"+cr.name); } } public static void main( String[] args){ ListTest lt =new ListTest(); lt.testAdd(); lt.testGet(); }}