就業(yè)班課件java基礎(chǔ)-第27天教學(xué)

1、第二十七天第二十七天【代此】【目標(biāo)：其他功能1、打印Stream(字節(jié)流)Writer(字符流Stream 打印的目的：File對(duì)象，字符串路徑，字節(jié)輸出流publicclassStreamDemopublicicvoidmain(Stringargs)throwsFiledir=new/演示Stream的特有方法/1,創(chuàng)建Stream對(duì)象。目的就定為文件Streamout=new/將數(shù)據(jù)打印到文件中/out.write(353);/字節(jié)流的write方法一次只寫出一個(gè)字節(jié)也就是將一個(gè)整數(shù)的最8位寫出/out.write(353.getBytes();/麻煩Writer：一樣具備打印功能Wri

2、ter：一樣具備打印功能Writer打印的目的：File對(duì)象，字符串路徑，字節(jié)輸出流，字符輸出2、管道publicclassPipedStreamDemopublicicvoidmain(Stringargs)throwsIOException/創(chuàng)建管道對(duì)象is = new PipedInputStream(); os=newPipedOutputStream();newThread(newpublicclassWriterDemopublicicvoidmain(Stringargs)throwsIOException/演示一個(gè)小例子1,BufferedReader bufr = new B

3、ufferedReader(new /2,定義目的w=newWriter(System.out,true);/對(duì)ln方法可以實(shí)現(xiàn)自/改變目的為文件。還想自動(dòng)刷String line = null; bufr.close();/不需要關(guān)閉鍵盤錄入這種標(biāo)準(zhǔn)輸入流。一旦關(guān)閉后面獲取不newThread(new/定義輸入任務(wù)classInputRunnablepis;publicnewThread(new/定義輸入任務(wù)classInputRunnablepis;publicInput(PipedInputStream pis) this.pis=pis;bytebuf=newbyte1024; try

4、len=Stringstr=newcatch(IOException/定義輸出任務(wù)classOutputRunnableos;);publicvoidrun()/通過write寫方法完.write(hi,管道來了catch(IOException3、隨流 / ，并通過seek 方法設(shè)置方byte 和3、隨流 / ，并通過seek 方法設(shè)置方byte 和功能 publicclasssFileDemopublicicvoidmain(Stringargs)throwsIOException*1，只能操作文件2，既能讀，又能寫了一個(gè)byte數(shù)組定義了字節(jié)流和寫和寫4，通過對(duì)指針的操作可以實(shí)現(xiàn)對(duì)文件的

5、任意位置publicicvoidreadFile()throwsIOException/sFileraf=newbytebuf=newbyte4; Stringname=age=publicicwriteFile()throwsIOException/1，創(chuàng)建一個(gè)隨sFileraf=new4、基本類4、基本類 【學(xué)習(xí)效publicclassDataStreamDemopublicicvoidmain(Stringargs)throwsIOExceptionpublicicvoidreadData()throwsIOExceptionFileInputStream fis = new FileI

6、nputStream(tempfiledaDataInputStream dis = new DataInputStream(fis);b = dis.readpublicicvoidwriteData()throwsIOException/寫入一些基本數(shù)據(jù)值到文件FileOutputStream fos = new FileOutputStream(tempfiledaDataOutputStream dos = new DataOutputStream(fos);/3,隨機(jī)寫入【目標(biāo)：GUI 概述【目標(biāo)：GUI 概述把1、GUI Javajava.awt javax.swing awt 2

7、、布局介AWT 包中常用類的繼承體系當(dāng)AWT 中的組件布局有多種方GridLayout網(wǎng)格式布局CardLayout卡片式布局3、簡單小publicclassFrameDemopublicicvoidmain(Stringargs)/創(chuàng)建窗體對(duì)Framefnew窗體【學(xué)習(xí)效【知識(shí)點(diǎn)?！緦W(xué)習(xí)效【知識(shí)點(diǎn)?！灸繕?biāo)：事】1、事機(jī)/創(chuàng)建按鈕對(duì)ButtonbutnewButton(按鈕2、事-定義的規(guī)范2、事-定義的規(guī)范Event3、事-publicclassFrameDemopublicicvoidmain(Stringargs)/創(chuàng)建窗體對(duì)Framefnew窗體/創(chuàng)建按鈕對(duì)ButtonbutnewBu

8、tton(按鈕/給按鈕添加事but.addActionListener(new ActionListener() /事件處理方publicvoidactionPerformed(ActionEvente)4、事-器規(guī)4、事-器規(guī)律當(dāng)需要給某個(gè)組件)添加對(duì)器方法時(shí)，常用的方式為組件/給按鈕添加鼠but.addMouseListener(new MouseAdapter() /鼠標(biāo)點(diǎn)擊時(shí)執(zhí)行的方publicvoidmouseClicked(MouseEvente)要查MouseEvent對(duì)象/判斷鼠標(biāo)是否被雙if(e.getClickCount()2)ln(mousedouble/給窗體添f.ad

9、dWindowListener(new WindowAdapter() /窗體關(guān)閉時(shí)執(zhí)行的方publicvoidwindowClosing(WindowEvent System.out.prln(windowclosing); /窗體打開時(shí)執(zhí)行的方publicvoidwindowOpened(WindowEventln(孔雀開屏！window publicvoidEvent-publicvoidEvent-publicclassFrameDemopublicicvoidmain(Stringargs)finalFramefnew窗體f.setSize(400, f.setLocation(450, f.setLayout(new TextFieldtf=new/給文本框添加鍵tf.addKeyListener(new KeyAdapter() publicvoidkeyTyped(KeyEvente)charkey=e.getKeyChar(); code=ln(code+.+code=if(!(code=KeyEvent.VK_0&code=KeyEvent.VK_9)e.consume();/ 直接取消默認(rèn)處理方式?！緦W(xué)習(xí)效【學(xué)習(xí)效【知識(shí)點(diǎn)【目標(biāo)：GUI 練習(xí)1、模擬 2文Dialog d =