这篇博客主要介绍了Java GUI编程的几个实例，包括使用JProgressBar实现进度条效果，JRadioButton创建单选按钮进行性别选择，以及使用BufferedReader和PrintWriter进行文件读写操作。此外，还提出了两个编程任务：一是设计一个根据用户勾选项计算和的界面，二是构建一个能通过文件导入或手动输入分析文本内容并分类显示字符类型的程序。
Java语言程序设计课程实验题目
第六次实验
1. 在IDE中输入并观察以下代码，分析该段程序的作用。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestJProgressBar extends JFrame implements ActionListener{
Container ctp = getContentPane();
JPanel jp = new JPanel();
JProgressBar tp = new JProgressBar(JProgressBar.HORIZONTAL, 0, 300);
public static void main(String[] args) {
TestJProgressBar tj = new TestJProgressBar();
tj.launchFrame();
}
public void launchFrame() {
JButton jb1 = new JButton("Start");
jb1.addActionListener(this);
ctp.add(tp, BorderLayout.NORTH);
ctp.add(jp, BorderLayout.CENTER);
jp.add(jb1);
jp.setLayout(new FlowLayout());
this.setSize(200,100);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
tp.setValue(0); // clear
MyRunner mr1 = new MyRunner();
Thread th1 = new Thread(mr1);
th1.start();
return;
}
class MyRunner implements Runnable {
public void run() {
while(tp.getValue() < tp.getMaximum()) {
tp.setValue(tp.getValue() + 1);
try {
Thread.sleep(20);
}catch(InterruptedException e) {}
}
}
}
}
2. 在IDE中输入并观察以下代码，分析该段程序的作用。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestJRadioButton implements ActionListener {
JLabel jl = new JLabel("Please select your gender");
ButtonGroup bg = new ButtonGroup();
JRadioButton rb1 = new JRadioButton("Male", false);
JRadioButton rb2 = new JRadioButton("Female", false);
public void launchFrame() {
JFrame f = new JFrame("Test JRadioButton");
Container ct = f.getContentPane();
ct.setLayout(new FlowLayout());
ct.add(jl); ct.add(rb1); ct.add(rb2);
// add two radio buttons into same button group
bg.add(rb1); bg.add(rb2);
// add Listener for two radio buttons
rb1.addActionListener(this); rb2.addActionListener(this);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(200,100); f.setVisible(true);
}
public static void main(String[] args){
TestJRadioButton tr = new TestJRadioButton();
tr.launchFrame();
}
public void actionPerformed(ActionEvent e ) {
String rbt = e.getActionCommand();
System.out.println("You selected " + rbt);
}
}
3. 在IDE中输入并观察以下代码，分析该段程序的作用。
import java.io.*;
public class WriteFile {
public static void main (String[] args) {
File file = new File("newfile.txt");
try {
BufferedReader in
= new BufferedReader(new InputStreamReader(System.in));
// Create a print writer on this file.
PrintWriter out = new PrintWriter(new FileWriter(file));
String s;
System.out.print("Enter file text. ");
System.out.println("[Type ctrl-d (or ctrl-z) to stop.]");
// Read each input line and echo it to the screen.
while ((s = in.readLine()) != null) { out.println(s); }
// Close the buffered reader and the file print writer.
in.close();
out.close();
} catch (IOException e) {
// Catch any IO exceptions.
e.printStackTrace();
}
}
}
4. 编写程序。
构建如图所示界面，
当用户勾选响应的物品时，请按照响应的数字相加求和。
注意，改程序应允许用户反复使用，无需每轮计算都要运行启动程序。
5. 编写程序。
采用可视化用户界面，构建程序。要求允许采用（1）文件导入（请自行查询Java的文件处理方法，配合使用JFileChooser）或（2）手工输入等两种方式向程序输入文本内容，对文本内容进行分析，识别得出文字中包含的字符成分，包括：大写字母、小写字母、空格、数字、其他符号，并归类之后在界面上输出结果。
1、
package org.cust.test6;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestJProgressBar extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 1L;
Container ctp = getContentPane();
JPanel jp = new JPanel();
JProgressBar tp = new JProgressBar(JProgressBar.HORIZONTAL, 0, 300);
public static void main(String[] args) {
TestJProgressBar tj = new TestJProgressBar();
tj.launchFrame();
}
public void launchFrame() {
JButton jb1 = new JButton("Start");
jb1.addActionListener(this);
ctp.add(tp, BorderLayout.NORTH);
ctp.add(jp, BorderLayout.CENTER);
jp.add(jb1);
jp.setLayout(new FlowLayout());
this.setSize(1200, 1200);
this.setVisible(true);
this.setResizable(true);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
tp.setValue(0); // clear
MyRunner mr1 = new MyRunner();
Thread th1 = new Thread(mr1);
th1.start();
return;
}
class MyRunner implements Runnable {
public void run() {
while (tp.getValue() < tp.getMaximum()) {
tp.setValue(tp.getValue() + 1);
try {
Thread.sleep(20);
} catch (InterruptedException e) {
}
}//进度条最大值300，每20毫秒+1的进度的速度跑满
}
}
}
2、
package org.cust.test6;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
public class TestJRadioButton implements ActionListener {
JLabel jl = new JLabel("Please select your gender");
ButtonGroup bg = new ButtonGroup();
JRadioButton rb1 = new JRadioButton("Male", false);
JRadioButton rb2 = new JRadioButton("Female", false);
public void launchFrame() {
JFrame f = new JFrame("Test JRadioButton");
Container ct = f.getContentPane();
ct.setLayout(new FlowLayout());
ct.add(jl);
ct.add(rb1);
ct.add(rb2);
// add two radio buttons into same button group
bg.add(rb1);
bg.add(rb2); // add Listener for two radio buttons
rb1.addActionListener(this);
rb2.addActionListener(this);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(800, 800);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
TestJRadioButton tr = new TestJRadioButton();
tr.launchFrame();
}
public void actionPerformed(ActionEvent e) {
String rbt = e.getActionCommand();
System.out.println("You selected " + rbt);
}
//此段代码是界面性别选择的单选框
//通过ButtonGroup嵌套JRadioButton实现单选
}
3、
package org.cust.test6;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
public class WriteFile {
public static void main(String[] args) {
File file = new File("newfile.txt");
try {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
// Create a print writer on this file.
PrintWriter out = new PrintWriter(new FileWriter(file));
String s;
System.out.print("Enter file text. ");
System.out.println("[Type ctrl-d (or ctrl-z) to stop.]");
// Read each input line and echo it to the screen.
while ((s = in.readLine()) != null) {
out.println(s);
}
// Close the buffered reader and the file print writer.
in.close();
out.close();
} catch (IOException e) {
// Catch any IO exceptions.
e.printStackTrace();
}
}
// 此段代码为文本输入,键盘点击 ctrl-d (or ctrl-z) 终止输入
}
4、
package org.cust.test6;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class TestJCheckBox extends JFrame implements ActionListener, ItemListener {
/**
*
*/
private static final long serialVersionUID = 1L;
private String right = "src/org/cust/test6/img/right.png";
private String wrong = "src/org/cust/test6/img/right.png";
private JCheckBox jcb1 = new JCheckBox("Pencil--10");
private JCheckBox jcb2 = new JCheckBox("Pen--20");
private JCheckBox jcb3 = new JCheckBox("Knife--30");
private JLabel jlb1 = new JLabel("Total:");
private JTextField jtf = new JTextField();
private JButton jb1 = new JButton("Clear");
private JPanel jp1 = new JPanel();
private JPanel jp2 = new JPanel();
private int sum = 0;
private int price[] = new int[] { 10, 20, 30 };
public TestJCheckBox() {
jcb1.setFont(new java.awt.Font("楷书", 1, 30));
jcb2.setFont(new java.awt.Font("楷书", 1, 30));
jcb3.setFont(new java.awt.Font("楷书", 1, 30));
jlb1.setFont(new java.awt.Font("楷书", 1, 30));
jb1.setFont(new java.awt.Font("楷书", 1, 30));
jtf.setFont(new java.awt.Font("楷书", 1, 30));
jcb1.addItemListener(this);
jcb2.addItemListener(this);
jcb3.addItemListener(this);
jb1.addActionListener(this);
jp1.add(jcb1);
jp1.add(jcb2);
jp1.add(jcb3);
jp2.add(jlb1);
jp2.add(jtf);
jp2.add(jb1);
jtf.setPreferredSize(new Dimension(200, 50));
this.add(jp1);
this.add(jp2);
this.setLayout(new GridLayout(2, 3));
this.setTitle("TestJCheckBox");
this.setVisible(true);
this.setLocationRelativeTo(null);
this.setSize(600, 300);
this.setResizable(true);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if (e.getActionCommand() == "Clear") {
jtf.setText("");
jcb1.setSelected(false);
jcb2.setSelected(false);
jcb3.setSelected(false);
}
}
@Override
public void itemStateChanged(ItemEvent e) {
// TODO Auto-generated method stub
JCheckBox jcb = (JCheckBox) e.getItem();
if (jcb.isSelected()) {
jcb.setIcon(new ImageIcon(this.right));
} else {
jcb.setIcon(new ImageIcon(this.wrong));
}
System.out.println("-------------");
boolean b[] = new boolean[3];
b[0] = jcb1.isSelected();
b[1] = jcb2.isSelected();
b[2] = jcb3.isSelected();
this.sum = 0;
for (int i = 0; i < b.length; i++) {
if (b[i]) {
this.sum += this.price[i];
}
}
jtf.setText(this.sum + "");
System.out.println("choose1:" + b[0]);
System.out.println("choose2:" + b[1]);
System.out.println("choose3:" + b[2]);
}
public static void main(String[] args) {
TestJCheckBox tjb = new TestJCheckBox();
}
}
效果图：
点击Clear后：
PS：
图中的勾与叉是图片。另外图片路径与格式需正确对应
right.png
wrong.png
5、
package org.cust.test6;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.filechooser.FileFilter;
import javax.swing.text.BadLocationException;
public class Test_1 extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 1L;
private static int TEXT_ROWS = 8;
private static int TEXT_COLUMS = 20;
private static int upperL;
private static int lowerL;
private static int space;
private static int number;
private static int other;
// private static byte[] fbyt;
private static JFileChooser jfc = new JFileChooser();
private static File file = null;
private static String str = null;
private static char[] strArray1;
private static char[] strArray2;
private static char[] strArray3;
private static JButton jb1 = new JButton("选择文件");
private static JLabel jlb1 = new JLabel("文件导入：");
private static JLabel jlb2 = new JLabel("手工输入框：");
final JTextArea textarea = new JTextArea(TEXT_ROWS, TEXT_COLUMS);
private static JLabel jlb3 = new JLabel("处理结果如下");
private static JLabel jlb4 = new JLabel("大写字母：");
private static JLabel jlb5 = new JLabel("小写字母：");
private static JLabel jlb6 = new JLabel("空 格：");
private static JLabel jlb7 = new JLabel("数 字：");
private static JLabel jlb8 = new JLabel("其他字符：");
private static JTextField jtf1 = new JTextField();
private static JTextField jtf2 = new JTextField();
private static JTextField jtf3 = new JTextField();
private static JTextField jtf4 = new JTextField();
private static JTextField jtf5 = new JTextField();
private static JPanel northjpanel = new JPanel();
private static JPanel southjpanel = new JPanel();
public Test_1() {
jb1.setFont(new java.awt.Font("楷书", 1, 30));
jb1.addActionListener(this);
jlb1.setFont(new java.awt.Font("楷书", 1, 30));
jlb2.setFont(new java.awt.Font("楷书", 3, 40));
jlb3.setFont(new java.awt.Font("楷书", 3, 40));
jlb4.setFont(new java.awt.Font("楷书", 1, 30));
jlb5.setFont(new java.awt.Font("楷书", 1, 30));
jlb6.setFont(new java.awt.Font("楷书", 1, 30));
jlb7.setFont(new java.awt.Font("楷书", 1, 30));
jlb8.setFont(new java.awt.Font("楷书", 1, 30));
jtf1.setFont(new java.awt.Font("楷书", 1, 30));
jtf2.setFont(new java.awt.Font("楷书", 1, 30));
jtf3.setFont(new java.awt.Font("楷书", 1, 30));
jtf4.setFont(new java.awt.Font("楷书", 1, 30));
jtf5.setFont(new java.awt.Font("楷书", 1, 30));
final JTextField textfield = new JTextField();
textfield.setPreferredSize(new Dimension(600, 20));
textarea.getDocument().addDocumentListener(new textfielsListener("txt"));
textfield.setFont(new java.awt.Font("楷书", 1, 40));
northjpanel.setPreferredSize(new Dimension(900, 200));
northjpanel.setLayout(new GridLayout(2, 1));
northjpanel.add(jlb1);
northjpanel.add(jb1);
northjpanel.add(jlb2);
southjpanel.setPreferredSize(new Dimension(900, 400));
southjpanel.setLayout(new GridLayout(6, 2));
// Border tb2 = BorderFactory.createTitledBorder("识别分类如下：");
// southjpanel.setBorder(tb2);
// southjpanel.setToolTipText("识别处理结果如下：");
southjpanel.add(jlb4);
southjpanel.add(jtf1);
southjpanel.add(jlb5);
southjpanel.add(jtf2);
southjpanel.add(jlb6);
southjpanel.add(jtf3);
southjpanel.add(jlb7);
southjpanel.add(jtf4);
southjpanel.add(jlb8);
southjpanel.add(jtf5);
textarea.setPreferredSize(new Dimension(900, 400));
textarea.setFont(new java.awt.Font("楷书", 1, 60));
JScrollPane scrollpane = new JScrollPane(textarea);
scrollpane.setPreferredSize(new Dimension(900, 400));
this.add(northjpanel, BorderLayout.NORTH);
this.add(scrollpane, BorderLayout.CENTER);
this.add(southjpanel, BorderLayout.SOUTH);
this.setResizable(true);
this.setVisible(true);
this.setSize(900, 1000);
this.setLocationRelativeTo(null);
this.setTitle("字符串输入处理");
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if (e.getActionCommand() == "选择文件") {
number = 0;
lowerL = 0;
upperL = 0;
space = 0;
// jfc.setFileSelectionMode(JFileChooser.FILES_ONLY);
// jfc.setMultiSelectionEnabled(false);
jfc.setCurrentDirectory(new File("."));
jfc.setFileFilter(new textfielsListener("txt"));
int i = jfc.showOpenDialog(null);
if (i == JFileChooser.APPROVE_OPTION) {
file = jfc.getSelectedFile();
System.out.println(file.getAbsolutePath());
textarea.setText("");
}
try {
InputStream is = new FileInputStream(file);
byte[] fbyt = new byte[is.available()];
is.read(fbyt);
System.out.println("文本内容：" + new String(fbyt));
String fstr = new String(fbyt);
char strArray1[] = fstr.toCharArray();
for (int j = 0; j < strArray1.length; j++) {
if (strArray1[j] >= '0' && strArray1[j] <= '9') {
number++;
} else if (strArray1[j] >= 'a' && strArray1[j] <= 'z') {
lowerL++;
} else if (strArray1[j] >= 'A' && strArray1[j] <= 'Z') {
upperL++;
} else if (strArray1[j] == ' ') {
space++;
}
}
other = strArray1.length - number - lowerL - upperL - space;
System.out.println("文本中字符串长度：" + strArray1.length);
jtf1.setText(upperL + "");
jtf2.setText(lowerL + "");
jtf3.setText(space + "");
jtf4.setText(number + "");
jtf5.setText(other + "");
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
public class textfielsListener extends FileFilter implements DocumentListener {
private String suffix;
@Override
public void removeUpdate(DocumentEvent e) {
System.out.println("执行操作：remove");
upperL = 0;
lowerL = 0;
space = 0;
number = 0;
other = 0;
try {
str = null;
str = e.getDocument().getText(0, e.getDocument().getLength());
strArray1 = str.toCharArray();
} catch (BadLocationException e1) {
e1.printStackTrace();
}
for (int i = 0; i < str.length(); i++) {
if (strArray2[i] >= '0' && strArray2[i] <= '9') {
number++;
} else if (strArray2[i] >= 'a' && strArray2[i] <= 'z') {
lowerL++;
} else if (strArray2[i] >= 'A' && strArray2[i] <= 'Z') {
upperL++;
} else if (strArray2[i] == ' ') {
space++;
}
}
other = str.length() - number - lowerL - upperL - space;
System.out.println(str.length());
jtf1.setText(upperL + "");
jtf2.setText(lowerL + "");
jtf3.setText(space + "");
jtf4.setText(number + "");
jtf5.setText(other + "");
}
@Override
public void insertUpdate(DocumentEvent e) {
System.out.println("执行操作：insert");
upperL = 0;
lowerL = 0;
space = 0;
number = 0;
other = 0;
try {
// str =
// e.getDocument().getText(e.getDocument().getStartPosition().getOffset(),
// e.getDocument().getLength())
str = null;
str = e.getDocument().getText(0, e.getDocument().getLength());
strArray2 = str.toCharArray();
} catch (BadLocationException e1) {
e1.printStackTrace();
}
for (int i = 0; i < strArray2.length; i++) {
if (strArray2[i] >= '0' && strArray2[i] <= '9') {
number++;
} else if (strArray2[i] >= 'a' && strArray2[i] <= 'z') {
lowerL++;
} else if (strArray2[i] >= 'A' && strArray2[i] <= 'Z') {
upperL++;
} else if (strArray2[i] == ' ') {
space++;
}
}
other = str.length() - number - lowerL - upperL - space;
System.out.println("输入字符串长度：" + str.length());
jtf1.setText(upperL + "");
jtf2.setText(lowerL + "");
jtf3.setText(space + "");
jtf4.setText(number + "");
jtf5.setText(other + "");
}
@Override
public void changedUpdate(DocumentEvent e) {
}
public textfielsListener() {
}
public textfielsListener(String suffix) {
this.suffix = suffix;
}
@Override
public boolean accept(File f) {
// TODO Auto-generated method stub
if (f.getName().endsWith(".txt") || f.isDirectory()) {
return true;
}
return false;
}
@Override
public String getDescription() {
// TODO Auto-generated method stub
return "文本文档（*.txt）";
}
}
public static void main(String[] args) throws InvocationTargetException, InterruptedException {
EventQueue.invokeAndWait(new Runnable() {
@Override
public void run() {
Test_1 test = new Test_1();
}
});
}
}
效果图：
输入：
删除：
文件选择：
确认选择：
扫一扫
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