本文實(shí)例為大家分享了Java swing讀取txt文件實(shí)現(xiàn)學(xué)生考試系統(tǒng)的具體代碼，供大家參考，具體內(nèi)容如下

主要實(shí)現(xiàn)了一個(gè)簡(jiǎn)單的倒計(jì)時(shí)答題系統(tǒng)

源碼Testquestion 類

public class Testquestion { private String questionText ='';//定義題目 private String standardkey = '';// 定義正確答案 private String selectKey ='';// 定義輸入答案 public Testquestion(String questionText, String standardkey) { super(); this.questionText = questionText; this.standardkey = standardkey; } public String getQuestionText() { return questionText; } public void setQuestionText(String questionText) { this.questionText = questionText; } public String getStandardkey() { return standardkey; } public void setStandardkey(String standardkey) { this.standardkey = standardkey; } public String getSelectKey() { return selectKey; } public void setSelectKey(String selectKey) { this.selectKey = selectKey; } public boolean check() { if (this.selectKey.equals(this.standardkey)) { return true; } else { return false; } } }

主程序Test2

import java.awt.*;import java.awt.event.*;import java.io.*;import java.text.NumberFormat;import java.util.*;import javax.swing.*;@SuppressWarnings('serial')public class Test2 extends JFrame implements ActionListener{ private JButton start,commit,back,next; private JRadioButton aButton,bButton,cButton,dButton; private ButtonGroup buttonGroup; private JLabel label,clock; private JTextArea jTextArea; private JPanel panel,panel2,panel3; Testquestion t1; Testquestion[] questions; int examtime; int p=0;//設(shè)置題目數(shù)指針 int topicnum=0; int right,error; //答對(duì)和答錯(cuò) ClockDispaly mt; //倒計(jì)時(shí)模塊 public Test2(){ this.setTitle('學(xué)生在線考試系統(tǒng)v1'); //設(shè)置標(biāo)題 this.setSize(440,320); //設(shè)置窗口大小 this.setLocationRelativeTo(null); //設(shè)置顯示位置居中 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //設(shè)置關(guān)閉時(shí)關(guān)閉 panel = new JPanel(); //初始化面板 panel2 = new JPanel(); panel3 = new JPanel(); label = new JLabel('總考試時(shí)間:100分鐘 '); //初始化并命名標(biāo)簽 clock = new JLabel(); jTextArea = new JTextArea(10,35); //初始化文本區(qū)域 jTextArea.setEditable(false); //設(shè)置文本不可修改 aButton = new JRadioButton('A'); //初始化單選按鈕 bButton = new JRadioButton('B'); cButton = new JRadioButton('C'); dButton = new JRadioButton('D'); buttonGroup = new ButtonGroup(); //初始化選項(xiàng)組 start = new JButton('開(kāi)始考試'); //初始化按鍵 back = new JButton('上一題'); next = new JButton('下一題'); commit = new JButton('提交考試'); aButton.addActionListener(this); //單選按鈕添加監(jiān)聽(tīng)事件 bButton.addActionListener(this); cButton.addActionListener(this); dButton.addActionListener(this); start.addActionListener(this); //按鈕添加監(jiān)聽(tīng)事件 back.addActionListener(this); next.addActionListener(this); commit.addActionListener(this); buttonGroup.add(aButton); //把單選按鈕放到選項(xiàng)組 buttonGroup.add(bButton); buttonGroup.add(cButton); buttonGroup.add(dButton); panel.add(label); //把標(biāo)簽放入面板panel panel.add(clock); panel.add(start); //把按鍵放入面板panel panel2.add(jTextArea); //把文本區(qū)域放入面板panel2 panel3.add(aButton); //把單選按鈕放入面板panel3 panel3.add(bButton); panel3.add(cButton); panel3.add(dButton); panel3.add(back); //把按鍵放入面板panel3 panel3.add(next); panel3.add(commit); this.add(panel,BorderLayout.NORTH); //設(shè)置面板panel放在上面 this.add(panel2,BorderLayout.CENTER); //設(shè)置面板panel2放在中間 this.add(panel3, BorderLayout.SOUTH); //設(shè)置面板panel放在下面 this.setVisible(true); //設(shè)置窗口可見(jiàn) mt = new ClockDispaly(clock, 30); //調(diào)用并設(shè)置倒計(jì)時(shí)的時(shí)間 } public void createExam() {//創(chuàng)建考試模塊 Vector<Testquestion> qList=null;//創(chuàng)建一個(gè)向量列表，用于動(dòng)態(tài)增加試題 Testquestion t; String questionText=''; String standardKey; String s; try { FileReader fr=new FileReader('D:test.txt'); BufferedReader br = new BufferedReader(fr); //可以每次讀一行 qList=new Vector<Testquestion>(); while((s=br.readLine())!=null){//讀取試題 if (s.equals('*****')){ questionText='';//準(zhǔn)備接收一個(gè)題目的內(nèi)容 s = br.readLine();//獲取試題內(nèi)容的首行 } if (s.equals('$$$$$')){//準(zhǔn)備讀取試題的答案 s = br.readLine(); //獲取試題的答案 standardKey = s; //把試題答案賦值給正確答案 t = new Testquestion(questionText,standardKey); //把試題和答案賦值給t qList.add(t); //把試題和答案賦值給列表 } questionText=questionText+s+’n’; } br.close();//關(guān)閉緩沖流 fr.close();//關(guān)閉文件流 } catch (IOException e) { e.printStackTrace(); //打印異常信息 } topicnum=qList.size(); //統(tǒng)計(jì)試題數(shù)量 questions=new Testquestion[topicnum]; for (int i=0;i<qList.size();i++) //讀取試題 questions[i]=qList.get(i); } public void setSelected(String s) {//設(shè)置單選按鈕不重復(fù)模塊 if (s.equals('A')) buttonGroup.setSelected(aButton.getModel(), true); if (s.equals('B')) buttonGroup.setSelected(bButton.getModel(), true); if (s.equals('C')) buttonGroup.setSelected(cButton.getModel(), true); if (s.equals('D')) buttonGroup.setSelected(dButton.getModel(), true); if (s.equals('')) buttonGroup.clearSelection(); } public void showQuestion() {//設(shè)置試題模塊 jTextArea.setText(''); jTextArea.append(questions[p].getQuestionText());//在文本區(qū)域顯示試題 setSelected(questions[p].getSelectKey()); } public void showScore() {//設(shè)置成績(jī)模塊 right=0;error=0; for (int i = 0; i < topicnum; i++) { if (questions[i].check()) {//判斷答案的正確與錯(cuò)誤 right++; }else { error++; } } int score = (int)(right*100/topicnum); //設(shè)置分?jǐn)?shù) JOptionPane.showMessageDialog(null, '答對(duì)'+right+'題，答錯(cuò)'+error+'題，分?jǐn)?shù)為'+score); } @Override public void actionPerformed(ActionEvent e) {//動(dòng)作監(jiān)聽(tīng)事件 if (e.getSource()==start) {//開(kāi)始開(kāi)始按鍵實(shí)現(xiàn) createExam(); //調(diào)用createExam模塊 p=0; //題目序號(hào) showQuestion(); //調(diào)用showQuestion模塊 start.setEnabled(false);//設(shè)置按鈕不可點(diǎn)擊 mt.start(); //考試時(shí)間倒計(jì)時(shí)啟動(dòng) } if (e.getSource()==back) {//上一題的按鍵實(shí)現(xiàn) p--; if (p==-1) { JOptionPane.showMessageDialog(null, '已經(jīng)是第一題'); p++; } showQuestion(); } if (e.getSource()==next) {//下一題的按鍵實(shí)現(xiàn) p++; if (p==topicnum) { JOptionPane.showMessageDialog(null, '已經(jīng)是最后一題'); p--; } showQuestion(); } if (e.getSource()==commit) {//提交試卷的按鍵實(shí)現(xiàn) showScore(); commit.setEnabled(false); System.exit(0); //退出 } if(e.getSource()==aButton) questions[p].setSelectKey('A'); if(e.getSource()==bButton) questions[p].setSelectKey('B'); if(e.getSource()==cButton) questions[p].setSelectKey('C'); if(e.getSource()==dButton) questions[p].setSelectKey('D'); } public static void main(String[] args) { new Test2(); }}class ClockDispaly extends Thread{//設(shè)置Thread考試倒計(jì)時(shí)模塊 private JLabel lefttimer; private int testtime; public ClockDispaly(JLabel lt,int time) { lefttimer = lt; testtime = time * 60; } public void run(){ NumberFormat numberFormat = NumberFormat.getInstance();//控制時(shí)間的顯示格式 numberFormat.setMinimumIntegerDigits(2);//設(shè)置數(shù)值的整數(shù)部分允許的最小位數(shù) int h,m,s;//定義時(shí)分秒 while (testtime >= 0) { h = testtime / 3600; m = testtime % 3600 / 60; s = testtime % 60; StringBuffer stringBuffer = new StringBuffer(''); //增加到lefttimer標(biāo)簽 stringBuffer.append('考試剩余時(shí)間為：'+numberFormat.format(h)+':'+numberFormat.format(m)+':'+numberFormat.format(s)); lefttimer.setText(stringBuffer.toString()); try { Thread.sleep(1000);//延時(shí)一秒 } catch (Exception e) { //ignore error } testtime = testtime - 1; } if (testtime <= 0) { JOptionPane.showMessageDialog(null, '考試結(jié)束'); System.exit(0); } }}

txt文件

效果圖

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