java信息工程02班-20107790261-杨新初-2011—09—08
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第1章Java集合和泛型技术及应用(第4/4部分)1.1深入理解和应用Java泛型技术1.1.1有届泛型类型及在项目中的应用1、对泛型的“类型通用性”加以一定的限制(1)泛型的“类型通用性”会为应用系统在运行过程中带来一定的性能开销泛型的“类型通用性”能够为读者带来代码的灵活性和功能实现的通用性,但这样的“灵活性”和“通用性”也为应用系统在运行过程中带来一定的系统性能开销。
因此,如果在具体应用中并不需要程序代码具有非常高的“灵活性”和“通用性”的要求,如果读者能够预知或者能够确定数据的可能类型的编程应用场合下,可以对泛型的“类型通用性”加以一定的限制。
这样的限制能够减少参数的数据类型在转换过程中所可能带来的系统性能开销,而且也能够在一定的程度上避免类型转换过程中有可能会出现的各种可能的错误。
(2)对泛型的“类型通用性”加以一定的限制在许多应用环境下,方法的功能实现代码中的各种参数的数据类型是已知的数据类型或者是有类型范围的,比如下面的泛型类代码示例中的泛型类型GenericType在具体应用时实际只能为UserInfoBase类及其子类的类型范围。
public class GenericTypeDemo<GenericType> {}由于在上面的代码示例中的泛型类型GenericType定义符是没有任何的类型限制的,实际上也就相当于该类为ng.Object类型——也就是相当于下面的有届泛型类定义:public class GenericTypeDemo<GenericType extends Object> {}这样的泛型类定义有点“太泛”了,因为系统中的数据类型实际只能是UserInfoBase 类及其子类的类型范围,不可能为其他的数据类型。
因此,读者可以对上面的有届泛型类型定义进一步类型具体化以缩小数据类型的范围。
2、有届泛型类型定义的语法在Java中的有届泛型类型定义是利用extends关键字来限定类型参数只能是某个类或它的子类的数据类型,如果存在有多个不同的限定时,则要采用“&”符号分开不同的类型名称。
Java学院:计算机科学学院 班级:计算机科学与技术2班 姓名:雷燕 学号:41209010227综合大作业一、问题背景和描述针对高等院校的教学过程,开发出相关的教学过程信息管理系统,提高教学质量。
教学过程如下图。
每项教学活动中都会产生相关信息,利用学习的知识对各种信息进行存储和维护。
二、问题分析及设计思路1、所需解决问题:实体功能存放位置界面风格填空题search&display File Swing2、实体分析:有实际意义实体:(1)填空题的存储位置在file中(2)属性为:题目内容,题目编号以及题目的答案(3)引用:先存入了F盘,然后再从文件中读取,然后按编号搜索及显示。
3、功能分析:查找功能需要首先输入要查找的题目编号,查找到题目内容并显示。
4、界面分析:只能用Swing继承自Jframe,界面风格为比较随意,整体风格比Awt显得更美观。
其中使用方法与AWT有些区别。
5、程序架构:查找和显示填空题:在界面上输入所需要查找的题目编号,点击ok,在界面中显示所找题号题目内容。
三、类图四、程序代码1.首先我创了一个填空题的类,其中它具有题目的编号,内容,正确答案的属性package package雷燕;//定义一个填空题的类public class Fullbank {int number;String connents;String answer;public Fullbank(int a,String b,String c) {number=a;connents=b;answer=c;}}2.我然后把几个填空题类存入了文件,是按对象存入public class putinfullbank {/*** @param args* @throws IOException*/public static void main(String[] args) throws IOException { Fullbank []b=new Fullbank[10];Scanner c=new Scanner(System.in);for(int i=1;i<=10;i++){b[i].number=c.nextInt();b[i].connents=c.next();b[i].answer=c.next();}FileOutputStream fos = new FileOutputStream("F:/zuoye/io.txt",true);ObjectOutputStream oos = new ObjectOutputStream(fos);oos.writeObject(b);oos.flush();oos.close(); // TODO Auto-generated method stub }}这段代码的截图是3.我创造了一个查找及显示的的方法,方法是从文件中按反序列读入几个填空题的类,按输入的需要查找的编号,和这几个类的编号属性进行比较,然后相同就返回对应类内容Private Stringsearch(int m[])throws IOException {// TODO Auto-generated methodint h=0;FileInputStream is = new FileInputStream("F:/zuoye/io.txt");ObjectInputStream ois = new ObjectInputStream(is); //创建从指定InputStream 读取的ObjectInputStreamFullbank[]b=new Fullbank[10];for(int j=1;j<=10;j++){b[j] = (Fullbank) ois.readObject();if(b[j].number!=m[]);elseh=j;//从ObjectInputStream 读取对象(a反序列化) }return b[h].connents;}}4.我然后创一个界面了,其中根据所需的的编号进行排题import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JTextField;public class Testfullbank extends JFrame {public Testfullbank(){setLayout(new GridLayout(5,6));add(new JLabel("填空题"));JTextField[]b=new JTextField[10];JLabel []c;int[]m;for(int k=1,j=1;k<=10;k++,j++){String s=JOptionPane.showInputDialog("请输入查询序号:");m[k]=Integer.parseInt(s);c[k]=new JLabel(""+search(m[j]));add(c[k]);add(b[k]);b[k].addActionListener(new lacctionlinter());}Public static void main(String[]arg){Testfullbank a=new Testfullbank();a.setTitle(‘the fulllbanks’);setLocationRelativeTo(null);setDefultCloseOperation(Jframe.EXIT_ON_CLOSE);setSie(400,250);setvisible(true); }这段代码的截图是:5.我对其中的文本框进行了监听,如果输入答案正确,就输出“正确”,反之“错误”mport javax.swing.JOptionPane;public class lacctionlinter implements ActionListener {public void actionPerformed(ActionEvent e) {String s=e.paramString();if(s.equalsIgnoreCase(b[k].awaner))System.out.println("right!");elseSystem.out.println("wrong!");// TODO Auto-generated method stub}其中代码运行结果如图:五、实验的心得及体会1,在文件中存入的时候,就是放的地方一般是不能是其它磁盘,只能是在开发环境所在的磁盘,不然会出现文件不存在的异常2,在文件的存入了,我开始是直接用的filioutputstream,然后写入是一个字节,一个字节写入,然后根本就存不完成,后来用对象流,在存入时,直接存入对象,很方便,便于读出3,在Swing界面中,设计风格比较美观,因为系统排版是默认的流线型,我的程序是填空题,我将排版改为了网格的,显得更有格式,在做界面时,应该要注意一下排版的格式4,在对文本框进行监听时,我重新定义了一个类,使它实现了监听器接口的行为,在注册监听器的时,要注意一下语句的表达。
1.1Java2应用开发工程师项目实战班培训教学课程安排1、授课内容2、项目详细介绍(1)项目一、Web服务器和代理服务器随着Internet的应用的深入,Web服务器和代理服务器将广泛地应用于企业和个人的网络访问中。
代理服务器对提高网络安全和速度、降低用户流量极为有用。
随着网络技术的不断发展,代理服务器将逐渐引起人们的重视,特别是防火墙的功能。
因此,代理服务器的功能及应用前景会越来越广。
为解决企业和个人的上网难的问题,故开发出该项目,主要达到为用户提供Web服务和代理服务两大功能。
(2)项目二、基于JA V A 的ICQ系统为什么选择Java来设计QICQ?:Java是Sun Microsystem公司的James Gosling开发的编程语言。
它以C++为基础,但是却是一个全新的软件开发语言。
Java是一个简单,面象对象,分布式,解释性,强壮,安全,与系统无关,可移植,高性能,多线程和动态的语言——这是Sun给Java的定义。
(3)项目三、网上营销系统开发该项目是一个完整的基于Web的商品进购存系统,具有对商品进、销、存管理;在线分析处理和数据挖掘等方面的功能。
同时还具有各种报表打印功能。
主要涉及Web组件(JSP/Servlet、JavaBean)(4)项目四、在线银行该项目是一个完整的基于Web的在线银行服务提供程序,银行客户可以通过internet 免费使用,并提供3种类型服务:用户的认证、查询服务、转账、支付服务、交易服务等。
运行平台:Weblogic。
数据库:Oracle9数据库系统。
主要涉及Web组件(JSP/Servlet)和EJB组件技术。
(5)项目五、在线拍卖它是企业级的拍卖行应用程序,能够在线完成物品拍卖交易并且能够实现用户注册与认证、拍项目列表、拍卖交易等功能。
运行平台:Weblogic。
数据库:Oracle9数据库系统。
几乎涵盖所有Java技术规范、框架及主要API。
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1.1跟我学Java入门到精通培训教程——在项目中应用Java泛型技术的实例1.1.1Java泛型相关的应用技术1、什么是泛型----泛型的本质是参数化类型(1)泛型的本质是参数化类型泛型是Java SE 1.5的新特性,泛型的本质是参数化类型,也就是说所操作的数据类型被指定为一个参数。
(2)泛型的种类这种参数类型可以用在类、接口和方法的定义中,分别称为泛型类、泛型接口、泛型方法。
(3)泛型类的代码示例public class SomeGenericsDemo<E> {Collection<E> oneCollection;public void doSomeThing(E oneElement) {oneCollection.add(oneElement);// ...}}2、为什么要应用泛型泛型就好比Word中的模板,在Word的模板中,提供了基本的文档编辑内容,在定义Word 模板时,对具体编辑哪种类型的文档是未知的。
在Java中,泛型则提供了类、接口和方法、变量等的模板,泛型也可以看作是占位符,与定义Word模板时类似,定义泛型时的具体类型是未知的。
(1)Java语言引入泛型的好处是安全和简单在Java SE 1.5之前,没有泛型的情况的下,通过对Object类型的对象引用来实现参数的“任意化”,“任意化”带来的缺点是需要在使用者的代码中要做显式的强制类型转换,而这种转换是要求开发者对实际参数类型是可以预知的情况下进行的。
public class SomeDigitClass{public void doSomeThing(Object oneParameterObject) {if(oneParameterObject instanceof Integer){Integer targetParameterObject=(Integer)oneParameterObject;}else if(oneParameterObject instanceof Float){Float targetParameterObject=(Float)oneParameterObject;}}}而对于强制类型转换错误的情况,编译器可能不提示错误,在运行的时候才出现异常,这是一个很严重的安全隐患。
基于Java web开发的学生信息管理系统摘要随着信息技术和网络技术飞速发展,管理信息系统具有重要的现实意义。
系统研究了管理信息系统(MIS)的概念、开发方法、运行模式以及体系结构,分析了传统管理信息系统存在的问题。
详细介绍了ASP技术,深入探讨了基于Web的管理信息系统工作原理。
阐述了对系统有着支持性作用的科技信息数据库,并从其功能、结构、选型上进行了设计。
此外还根据数据库范式理论分析了部分数据库表的结构,并给出一组实用数据库表的定义;利用数据库视图、触发器技术实现了系统中约束规则在数据层与应用层的合理划分。
关键词:管理信息系统,web技术,ASP技术,数据With the rapid development of information technology and network technology, the management information system has important practical significance. System research the concept of management information system (MIS), development methods, operational mode and structure of system, analyzes the problems existing in the traditional management information system. ASP technology was introduced in detail, and discussed the working principle of the management information system based on Web.The database of a supporting role of science and technology information to system will be designed from its function, structure, selection . In addition, according to the theory of database model ,it analysis part of the structure of the database table and gives the definition of a set of practical database tables; The system of using database views, triggers technology achieves the constraint rules reasonable division in the data layer and application layer.Keywords: management information system, web technology, ASP technology, the database目录一、引言 (3)二、系统相关技术分析 (1)1.Web技术 (1)1.1访问Web数据库 (1)1.2 Web接口 (1)1.3 Web数据库访问体系结构 (1)2. ASP技术 (2)2.1 ASP的概念 (2)2.2 ASP的内置对象 (2)三、设计说明 (3)1.功能结构 (3)2.项目架构 (4)3.包及Java类说明 (4)4.数据库设计 (5)四、功能实现 (6)1.登陆 (6)2.系统主界面 (6)3.添加学生信息 (7)4.学生信息维护 (8)5.根据学号查找学生 (8)6.更新学生信息 (9)7.删除学生信息 (9)8.更改管理员密码 (9)9.退出系统 (10)五、总结 (10)六、参考文献 (10)一、引言学生信息管理系统的目的比较明确,就是提供信息的添加、查找、修改、删除等功能,实现起来比较简单,但是它所处理的信息却相当重要的,关系到一个企业的发展和计划,所以说更好得实现信息管理系统是相当重要的,它可以更好的帮助学校管理和收集各方面的信息。
J2EE课程设计及项目实训教学——Java软件工程师实训项目简介1.1.1“蓝梦教育集团即时通讯系统”实训项目1、即时通讯项目介绍,利用企业即时通讯(IM系统)可以建立一个以自身公司为核心的即时通讯平台,创造新型办公沟通模式,提升办公效率,降低企业通信费用,增强企业内部沟通能力,改善企业与客户之间的沟通渠道。
用户可以直接用邮箱、IM号和手机号登录,提供即时通讯等方面的功能。
2、蓝梦教育集团即时通讯系统著名教育企业蓝梦教育集团(Blue Dream Group),为了能够在中国迅速地开展与教育产品和IT技能培训有关的各个方面的业务、并期望能够取得比较好的效益和提高各项教育产品的质量以迎接新的挑战,需要全面地提升本土化的信息化项目建设的进度、拟计划开发出蓝梦教育集团即时通讯系统提高企业内部的工作效率。
3、第一个阶段的项目介绍——蓝梦教育集团即时通讯系统在本课程阶段教学结束后,学生应该能够开发实现出“蓝梦教育集团即时通讯系统”,将在本阶段所学习到的Swing GUI、JDBC、工厂模式和单例模式、XML技术、Java 反射机制等技术应用在此项目中。
4、为什么要选择此IM系统项目(1)IM系统是比较流行的企业通讯项目企业即时通讯系统是目前企业内部员工之间、企业与外界之间通讯的主要工具,并能够打破地域的限制。
同时,IM系统的技术含量也比较高,涉及网络技术、多线程、GUI、数据库访问等核心技术,能够综合在此阶段所学习到的各个方面的知识。
(2)达到“学中做、做中学”的教学目标通过让学生开发出此项目,不仅可以锻炼学生独立解决问题的能力,达到“学中做、做中学”的教学目标,也能够帮助教师检验教学中的效果。
(3)学生也比较熟悉和感兴趣由于绝大部分学生都用过腾讯公司的QQ软件和微软的MSN软件,对即时通讯系统也比较熟悉,而且也会很感兴趣。
5、项目的部分示例截图如下1.1.2“蓝梦商业集团客户关系管理系统”实训项目1、项目立项背景说明国内著名的蓝梦商业集团(BlueDream Business Group),为了能够在国内迅速地开展连锁加盟机构以扩大其商业销售渠道,急需开发一套适合本企业经营和管理要求的客户关系管理(CRM,Customer Relationship Management)系统。
1.1命令方式的蓝梦学院选课系统项目完整实现实例(第3部分)1.1.1系统编程学核心业务功能实现——编程学生课程信息管理类中的相关方法package com.px1987.course.service.imple;import java.util.Iterator;import java.util.Scanner;import java.util.Set;import com.px1987.course.dao.SelectCourseResultPO;import com.px1987.course.dao.DataBase;import com.px1987.course.dao.StudentInfoPO;import com.px1987.course.service.inter.CourseManageInter;public class CourseManageImple implements CourseManageInter {public CourseManageImple() {}@Overridepublic void addOneCourse() {/*** 识别选课的学生是否登录---如果没有登录,显示相关的错误并退出选课的过程*/if(DataBase.loginedStudentInfoPO == null){System.out.println("你没有登录本系统,将不能进行选课!\n");return;}/*** 如果登录过并且登录成功,显示出相关的课程信息并进行选择——包装键盘和创建键盘输入*/Scanner currentKeyBoard =null;currentKeyBoard=new Scanner(System.in);/*** 提示输入课程相关的信息,并获得所输入的课程相关信息*/System.out.println("课程名称:");String courseName = currentKeyBoard.nextLine();/*** 识别是否存在重复选课——首先获得当前正在选课的学生信息(从Session缓存中获得)以及所选的各个课程信息;* 如果存在重复的选择,则显示错误信息并退出保存的过程*/StudentInfoPO currentSelectedCourseStudentPO=DataBase.loginedStudentInfoPO;if(currentSelectedCourseStudentPO.allSelectedCourseInfo.containsKey(courseName)){ System.out.println(courseName+"课程已经选择了,不允许重复选择该课程!");return;}/*** 如果不存在重复的选择,则继续显示课程的其它信息并输入这些信息*/System.out.println("授课教师:");String teacherName = currentKeyBoard.nextLine();System.out.println("开课时间:");String courseTime = currentKeyBoard.nextLine();System.out.println("课程学分:");int courseCreit= currentKeyBoard.nextInt();/*** 将所获得学生所选择的各个课程信息包装(转换)到一个课程信息实体对象*/SelectCourseResultPO selectedOneCoursePO=new SelectCourseResultPO();selectedOneCoursePO.setCourseName(courseName);selectedOneCoursePO.setTeacherName(teacherName);selectedOneCoursePO.setCourseTime(courseTime);selectedOneCoursePO.setCourseCreit((byte)courseCreit);/*** 保存该学生的选课结果到该学生的选课结果列表中*/currentSelectedCourseStudentPO.allSelectedCourseInfo.put(courseName, selectedOneCoursePO);System.out.println(courseName+"课程已经选择完毕并添加到已选课程的列表中,请继续选其它课程!");}@Overridepublic void printAllSelectedCourse() {/*** 识别退选课的学生是否登录---如果没有登录,显示相关的错误并退出退选课的过程*/if(DataBase.loginedStudentInfoPO == null){System.out.println("你没有登录本系统,将不能打印已选课程清单!\n");return;}/*** 再识别是否选过课程(也就是识别选课清单是否为空)——首先从缓存中获得当前退选课的学生*/StudentInfoPO currentRemovedCourseStudentPO=DataBase.loginedStudentInfoPO;if(currentRemovedCourseStudentPO.allSelectedCourseInfo.isEmpty()){System.out.println("你没有选过任何的课程,将不能打印已选课程清单!\n");return;}System.out.println("课程名称"+"\t"+ "授课教师"+"\t\t"+ "上课时间"+"\t"+ "课程学分");/*** 从缓存中获得存储已选的所有课程的集合*/Map selectedCourseMap=currentRemovedCourseStudentPO.allSelectedCourseInfo;Set allCoureNameKey=selectedCourseMap.keySet();Iterator allCourseName=allCoureNameKey.iterator();while(allCourseName.hasNext()){String oneCourseName=(String)allCourseName.next();/*** 获得所选的某门课程的实际体对象*/SelectCourseResultPO selectedOneCoursePO=(SelectCourseResultPO)selectedCourseMap.get(oneCourseName);/*** 以行、列的表格形式显示输出所有的课程信息*/System.out.println(selectedOneCoursePO.getCourseName()+"\t"+selectedOneCoursePO.getTeacherName()+"\t\t"+selectedOneCoursePO.getCourseTime()+"\t"+selectedOneCoursePO.getCourseCreit());}}@Overridepublic void removeOneCourse() {/*** 识别退选课的学生是否登录---如果没有登录,显示相关的错误并退出退选课的过程*/if(DataBase.loginedStudentInfoPO == null){System.out.println("你没有登录本系统,将不能进行退选课!\n");return;}/*** 再识别是否选过课程(也就是识别选课清单是否为空)——首先从缓存中获得当前退选课的学生*/StudentInfoPO currentRemovedCourseStudentPO=DataBase.loginedStudentInfoPO;if(currentRemovedCourseStudentPO.allSelectedCourseInfo.isEmpty()){System.out.println("你没有选过任何的课程,将不能进行退选课!\n");return;}/*** 显示退选的课程信息清单界面,并等待该学生选择所要退选的课程,最后再获得所输入的退选课程的名称*/Scanner currentKeyBoard =null;currentKeyBoard=new Scanner(System.in);System.out.println("课程名称:");String courseName = currentKeyBoard.nextLine();/*** 识别所选择的待退选的课程是否已经选过,如果没有选过则显示错误信息并退出退选课程的过程*/if(!currentRemovedCourseStudentPO.allSelectedCourseInfo.containsKey(courseName)){System.out.println("你没有选过"+courseName+"课程,将不能对该课程退选!\n");return;}/*** 如果所选择的待退选的课程是否已经选过,则删除该课程,从而达到退选的效果*/currentRemovedCourseStudentPO.allSelectedCourseInfo.remove(courseName);System.out.println(courseName+"课程已经退选完毕!请继续选其它课程!");}}1.1.2将本项目进行发布打包和创建API文档1、发布打包D:\CourseManage.jar创建*.bat文件java -jar CourseManage.jar 执行该*.bat文件2、创建API文档改变标题文字:CourseManage的API文档。
Java:梦开始的地方
鹰扬
【期刊名称】《软件工程师》
【年(卷),期】2003(000)003
【摘要】@@ 2002年1月1日,梦想开始,rn2002年4月1日,梦想成真.rn历时整整三个月.rn之所以开篇就交代了我复习这门考试的时间,目的只有一个--给每一个想通过这门考试的朋友以信心.
【总页数】2页(P55-56)
【作者】鹰扬
【作者单位】无
【正文语种】中文
【中图分类】TP312
【相关文献】
1.立足中原梦发挥好作用--浅谈如何围绕实现中原梦发挥地方人大及其常委会职能作用 [J], 高献涛
2.无线Java无限“钱”景——“中国移动-摩托罗拉杯第一届移动梦网无线Java 应用设计大赛“侧记 [J], CSDN
3.梦开始的地方——《童梦Online》前瞻 [J], 无
4.谢正学梦桑阁梦开始的地方 [J], ;
5.兰台梦职教情——梦的种子播撒的地方 [J], 兰泽锦
因版权原因,仅展示原文概要,查看原文内容请购买。
1.1跟我学Java入门到精通培训教程——第7章JavaBean编程技术及应用实例(第2部分)1.1.1JavaBean中限制属性的实现代码示例为Bean增加事件处理的功能,使其可响应用户的鼠标点击事件、焦点事件、鼠标进入退出和按下释放等事件;同时也为它提供按下与否down标识、是否获得焦点hasFocus、以及按纽的文字前景颜色foregroundColor共三个属性。
import java.awt.*;import java.io.Serializable;import java.beans.*; //为了能够使用PropertyChangeSupport类和使用VetoableChangeSupport 类import java.awt.event.*;public class JavaBeanButton extends Canvas implements Serializable {//任何实现了Serializable接口的Java类都可以成为一个JavaBean类,并且可以实现默认的序列化。
private Color backgroundColor=Color.lightGray;private String label;static final int TEXT_XPAD=12;static final int TEXT_YPAD=8;private PropertyChangeSupport changes=new PropertyChangeSupport(this);//实例化一个PropertyChangeSupport类的对象,它用于管理注册的监听器列表和属性改变事件通知的发送private VetoableChangeSupport vetos=new VetoableChangeSupport(this);//实例化一个VetoableChangeSupport类的对象,它用于管理注册的监听器列表和属性限制事件通知的发送private boolean down;private transient boolean hasFocus;private Color foregroundColor;private transient ActionListener actionListener=null;private transient MouseListener mouseListener=null;private transient FocusListener focusListener=null;public JavaBeanButton(){this("确定",true); //设置Bean的初始Label文字}public JavaBeanButton(String label,boolean down) {//设计一个带参数的构造函数以初始化Bean的Label属性super(); //通过调用基类的构造函数,以获得Canvas的一般特性bel=label;this.foregroundColor=Color.black;this.down=down;this.setFont(new Font("Dialog",Font.PLAIN,12)); //设置Bean的初始字体this.enableEvents(AWTEvent.FOCUS_EVENT_MASK| //必须设置此方法,否则Bean不能接受事件AWTEvent.MOUSE_EVENT_MASK|AWTEvent.MOUSE_MOTION_EVENT_MASK|AWTEvent.ACTION_EVENT_MASK);}public void setBackgroundColor(Color backgroundColor){this.backgroundColor=backgroundColor;repaint();}public Color getBackgroundColor(){return this.backgroundColor;}public String getLabel(){return label;}public void setLabel(String newLabel) throws PropertyVetoException{String oldLabel=label;//在属性修改的方法体内,在修改限制属性之前触发属性否决事件,并传递原始的属性值和新的属性值(要求为Object对象类型的参数)vetos.fireVetoableChange("label",oldLabel,newLabel);label=newLabel;sizeToFit();//如果目标监听器允许限制属性的值被修改,将继续触发属性被修改事件changes.firePropertyChange("label",oldLabel,newLabel);//在属性修改的方法体内,在修改完关联属性后将触发属性修改事件}//实现维护属性修改监听器列表的方法(添加和删除)public void addPropertyChangeListener(PropertyChangeListener listener) {changes.addPropertyChangeListener(listener);}public void removePropertyChangeListener(PropertyChangeListener listener) { changes.removePropertyChangeListener(listener);}//实现维护限制属性修改的监听器列表的方法(添加和删除)public void addVetoableChangeListener(VetoableChangeListener listener){vetos.addVetoableChangeListener(listener);}public void removeVetoableChangeListener(VetoableChangeListener listener){ vetos.removeVetoableChangeListener(listener);}public Dimension getPreferredSize(){FontMetrics fm=getFontMetrics(getFont());return new Dimension(fm.stringWidth(label)+TEXT_XPAD,fm.getMaxAscent()+fm.getMaxDescent()+TEXT _YPAD);}public Dimension getMinimumSize(){return this.getPreferredSize();}private void sizeToFit(){//根据Bean上的文字长度实现调整Bean的尺寸的方法Dimension d=getPreferredSize();resize(d.width,d.height);Component p=getParent();if(p !=null){p.invalidate();yout();}}public void setFont(Font f){super.setFont(f);sizeToFit();}public void setForegroundColor(Color foregroundColor) {this.foregroundColor=foregroundColor;repaint();}public Color getForegroundColor(){return this.foregroundColor;}public boolean getHasFocus(){return this.hasFocus;}public void setHasFocus(boolean hasFocus){this.hasFocus=hasFocus;repaint();}public boolean isDown(){return this.down;}public void setDown(boolean down){this.down=down;repaint();}public synchronized void paint(Graphics g) {int width=this.getSize().width;int height=this.getSize().height;g.setColor(backgroundColor);g.fillOval(0,0,width,height);g.setColor(foregroundColor);FontMetrics fm=g.getFontMetrics(); //确保文字在按钮的中央if(down){g.drawString(label,((width-fm.stringWidth(label))/2)+2,((height+fm.getMaxAscent()-fm.getMaxDescent())/2)+1);}else {g.drawString(label,(width-fm.stringWidth(label))/2,(height+fm.getMaxAscent()-fm.getMaxDescent())/2);}if(hasFocus) {g.setColor(Color.lightGray);g.drawOval(2,2,width-6,height-6);}}//实现维护鼠标点击事件的监听器列表的方法(添加和删除)public synchronized void addActionListener(ActionListener listener) { actionListener=AWTEventMulticaster.add(actionListener,listener);}public synchronized void removeActionListener(ActionListener listener){ actionListener=AWTEventMulticaster.remove(actionListener,listener);}public synchronized void addMouseListener(MouseListener listener) { mouseListener=AWTEventMulticaster.add(mouseListener,listener);}public synchronized void removeMouseListener(MouseListener listener) { mouseListener=AWTEventMulticaster.remove(mouseListener,listener);}public synchronized void addFocusListener(FocusListener listener){ focusListener=AWTEventMulticaster.add(focusListener,listener);}public synchronized void removeFocusListener(FocusListener listener){ focusListener=AWTEventMulticaster.remove(focusListener,listener);}//向所有注册ActionListener的组件分发ActionEvent事件protected void processActionEvent(ActionEvent e){if(actionListener !=null){actionListener.actionPerformed(e);}}protected void processFocusEvent(FocusEvent e){ switch(e.getID()) {case FocusEvent.FOCUS_GAINED:hasFocus=true;repaint();if(focusListener !=null){focusListener.focusGained(e);}break;case FocusEvent.FOCUS_LOST:hasFocus=false;repaint();if(focusListener !=null){focusListener.focusLost(e);}break;}super.processFocusEvent(e);}protected void processMouseEvent(MouseEvent e){ switch(e.getID()) {case MouseEvent.MOUSE_PRESSED:down=!down;repaint();if(mouseListener !=null){mouseListener.mousePressed(e);}break;case MouseEvent.MOUSE_RELEASED: if(down){fireActionEvent();down=false;repaint();}if(mouseListener !=null){mouseListener.mouseReleased(e);}break;case MouseEvent.MOUSE_CLICKED: if(mouseListener !=null){mouseListener.mouseClicked(e);}break;case MouseEvent.MOUSE_ENTERED: if(mouseListener !=null){mouseListener.mouseEntered(e);}break;case MouseEvent.MOUSE_EXITED: if(mouseListener !=null){mouseListener.mouseExited(e);}break;}super.processMouseEvent(e);}private void fireActionEvent() {//内部支持方法processActionEvent(new ActionEvent(this,ActionEvent.ACTION_PERFORMED,null));}}1.1.2JavaBean的事件编程1、通过事件处理机制所产生的效果可让一些组件作为事件源,发出可被描述环境或其它组件接收的事件。
姓名:杨新初学号:20107790261 班级:信息工程02班日期:2011-09-08
1 输出以下信息,并从键盘输入相应信息
import java.util.*;
public class Personinfomation
{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
System.out.print("学号:");
String number=in.nextLine();
System.out.print("姓名:");
String name = in.nextLine();
System.out.print("家庭地址:");
String home = in.nextLine();
System.out.print("所学专业:");
String sdept=in.nextLine();
System.out.print("联系电话:");
String phone=in.nextLine();
}
}
2 从键盘输入三个数后,按从小到大依次输出
import java.util.*;
public class Imfomation
{
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
System.out.println("输入一个整数:");
int a=in.nextInt();
System.out.println("输入一个整数:");
int b=in.nextInt();
System.out.println("输入一个整数:");
int c=in.nextInt();
System.out.println();
int t=0;
if (a<b)
{
t = a;
a = b;
b = t;
}
if (a < c)
{
t = a;
a = c;
c = t;
}
if (b < c)
{
t = b;
b = c;
c = t;
}
System.out.println(c);
System.out.println(b);
System.out.println(a);
}
}
3 输出一个复数类型
import java.util.*;
public class ComplexNumber
{
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
System.out.println("输入一个整数:");
int a=in.nextInt();
System.out.println("输入一个整数:");
int b=in.nextInt();
if (b < 0)
{
System.out.println(a+b+"i");
}
if (b == 0)
{
System.out.println(a);
}
if (b> 0)
{
System.out.println(a+"+"+b+"i");
}
}
}
4 查找一个数的完全质因子import java.util.*;
public class Try
{
static boolean is_odd(int n)
{
if(n==2||n==3) return true;
if(n%2==0) return false;
for( int i=3;i<=n/2;i+=2)
if(n%i==0) return false;
return true;
}
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
System.out.println("输入一个整数数值:");
int n=in.nextInt();
System.out.print(n+"的质因子有:");
for(int i=2;i<=n;i++)
{
if(!is_odd(i)) continue;
if(n%i==0)
{
if(true)
{
System.out.print(i);
System.out.print(",");
}
}
}
System.out.println();
}
}
5 输入一组数字,计算最大值,最小值,以及平均值
import java.util.*;
public class Lonk
{
public static void main(String[] args)
{
int i=0;
int j=0;
Scanner in=new Scanner(System.in);
System.out.println("输入一个整数:");
System.out.println();
System.out.println("注意以零作为结束标志!");
i=in.nextInt();
double sum=0;
int max=i;
int min=i;
double avg=i;
do
{
j++;
if(max<i)
max=i;
if(min>i)
min=i;
sum+=i;
avg=sum/j*1.0;
i=in.nextInt();
}while(i!=0);
System.out.println("the avg is:"+avg);
System.out.println("the max is:"+max);
System.out.println("the min is:"+min);
}
}
三上机题
public class Imfomation
{
public static void main(String[] args)
{
System.out.println("——————————————————————————"); System.out.println(" 星期一星期二星期三星期四星期五");
System.out.println("——————————————————————————"); System.out.println("1 "); System.out.println("——————————————————————————"); System.out.println("2 "); System.out.println("——————————————————————————"); System.out.println("3 "); System.out.println("——————————————————————————"); System.out.println("4 "); System.out.println("——————————————————————————"); System.out.println("|5 "); System.out.println("——————————————————————————"); System.out.println("6 "); System.out.println("——————————————————————————");
} }。