day17-集合set实现类day16作业答案

1、1:List1:ListpackagepublicclassStudentprivateStringpublicStudent()publicStudent(Stringage)=name; this.age = age;publicStringgetName()returnpublicvoidsetName(Stringname)=Eclipse 中的黄色警告线，优 : : Vector: 底层是数组结构，是集合中的始祖，ArrayList 就是向这getAge()getAge()returnpublicvoidage)this.age=publicStringtoString()retur

2、nStudentname=+name+,age=+age+packageimport java.util.ArrayList; import java.util.Iterator; importjava.util.LinkedList; import java.util.List;importpublicclassListDemopublicicvoidmain(Stringargs)publicicvoidexerciseList()ListstuArray=newstuArray.add(newStudent( ,25); stuArray.add(newStudent( ,18); st

3、uArray.add(newStudent( ,for(Iterator it=stuArray.iterator(); isNext();) Student stu = it.next();packageimport java.util.ArrayList; import packageimport java.util.ArrayList; import java.util.Iterator; importjava.util.LinkedList; import java.util.List;importpublicclassListStringTestpublicicvoidmain(St

4、ringargs)publicicvoidexerciseList()ListstrArray=newArrayList(); sNext();)ListstuLinked=newstuLinked.add(newStudent( ,25); stuLinked.add(newStudent( ,23); stuLinked.add(newStudent( ,for(ListIteratorlit=stuLinked.listIterator(); sNext();) Studentstu=lit.next(); 。package。packageimport java.util.HashSet

5、; import java.util.Iterator; importjava.util.ListIterator; import java.util.Set;importimportpublicImplimplementsprivate sicSetuserSet=newHashSet(); isLogin(Stringusername,Stringpassword)flag=for(Iterator it=userSet.iterator(); isNext();) User user = it.next();if(user!=null)String s = it.next(); List

6、strLinked=newfor(ListIteratorlit=strLinked.listIterator(); sNext();) Strings=lit.next(); if(user.getUsername().equals(username)& user.getPassword().equals(password) flagif(user.getUsername().equals(username)& user.getPassword().equals(password) flag=true; returnreturnpublicvoidregist(Useruser)delete

7、(Stringusername)flag=for(Iterator it=userSet.iterator(); isNext();) User user = it.next(); if(user.getUsername().equals(username) flag=true; returnreturnpublicvoidshowUsersInfo()if(userSet.size() = 0) elsefor(Iterator it=userSet.iterator(); isNext();) User user = it.next();package com.itheima.packag

8、e com.itheima.import java.util.Scanner; import com.itheima.importimportpublicoolpublic sicvoiduserLoginSystem() ud = new Userwhile(true) Scannersc=newScanner(System.in);ln(n+请选择：1. 登录3.删除 4.显示用户 5. 退出 );Stringline=switch(line)caseString username = sc.nextLine(); String password = sc.nextLine();flag=

9、ud.isLogin(username,if(flag)elsecase 2case 2:StringnewUsername=sc.nextLine(); String nessword=sc.nextLine();= sc.nextLine(); String phone = sc.nextLine();*/User user = new User(); 成功case 3:StringdelUsername=delFlag=if(delFlag)elsecase 4:case 5:StackpackageStackpackageimportimport*publicclassStackDem

10、opublicicvoidmain(Stringargs)/TODOAuto-generatedmethodpublic sic void exerciseStack() Stackstack=newStack();for(Enumeratione=stack.elements();e.hasMoreElements();) String s = e.nexi=0;istack.size();i+) sNext();) : 和packageimportjava.util.Iterator; import java.util.Set; import java.util.TreeSet;publicclassSetStringTestpublicicvoidmain(Stringargs)/TODOAuto-generatedmethodpublicicvoidexerciseSet()SetstrSet=newfor(Iterator it=strSet.iterator(); isNext();) String