Java Cookbook - Problems and Solutions for Java Developers (Early Release).epub
Java continues to grow and evolve, and this Cookbook continues to evolve in tandem. This book helps to get you up to speed right away with hundreds of hands-on recipes across a broad range of Java topics. You’ll learn useful techniques for everything from string handling and functional programming to network communication.Each recipe includes self-contained code solutions that you can freely use, along with a discussion of how and why they work. If you are familiar with the basics of the Java language, this cookbook will bolster your knowledge of the language in general and its many recent changes and how to apply them in your day-to-day development.Recipes include:Methods for compiling, running, and debugging“Packaging” Java classes and building applicationsManipulating, comparing, and rearranging textRegular expressions for string- and pattern-matchingHandling numbers, dates, and timesStructuring data with collections, arrays, and other typesObject-oriented and functional programming techniquesInput/Output, Directory and filesystem operationsNetwork programming on both client and serverProcessing JSON for data interchangeMultithreading and concurrencyUsing Java in Big Data applicationsInterfacing Java with other languages------------------The 4th Edition of this book has been updated to cover changes through Java 12 and includes new recipes for Big Data and data science.
- 2020-03-03下载
- 积分：1
java实验室预约管理系统（源码+数据库脚本）
随着高校教学资源逐步开发，高校教育资源的应用种类逐步增多。而实验室作为高校基本教育资源之一，与日常教学工作开展、课堂项目实践有着密切联系。由此，如何借助新时期技术，加强高校实验室应用数据信息程序开发，在高校智能化管理程序推广中占有基础性地位。该软件是以Java语言为实现预言。其功能在系统内部有源代码直接完成，操作人员只需输入一些简单的汉字，数字，即可达到自己的目标。 登陆账号：admin 密码：123456 package com.company; import com.company.Bean.Student;import com.company.Bean.Teacher;import com.company.Bean.User;import com.company.DB.DB; import javax.swing.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener; public class Main extends JFrame { private JPanel p; private JLabel lblName,lblPwd,lblRole; private JTextField txtName; private JPasswordField txtPwd; private JButton btnOk,btnCancle; String[] s = {"学生","教师","管理员"}; private JComboBox comboBox; public Main(){ super("用户登录界面"); p = new JPanel(); p.setLayout(null); lblRole=new JLabel("角色："); comboBox=new JComboBox(s); lblName = new JLabel("账户："); lblPwd = new JLabel("密码："); txtName = new JTextField(20); txtPwd = new JPasswordField(20); btnOk = new JButton("登录"); btnCancle = new JButton("取消"); //注册确定按钮的事件处理 btnOk.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String strName = txtName.getText(); String strPwd = new String(txtPwd.getPassword()); System.out.println("用户名:" strName "密码:" strPwd); } }); //注册取消按钮的事件处理 btnCancle.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { //清空 txtName.setText(""); txtPwd.setText(""); } }); lblRole.setBounds(90,50,60,25); comboBox.setBounds(130,50,140,25); lblName.setBounds(90,80,60,25); txtName.setBounds(130,80,140,25); lblPwd.setBounds(90,110,60,25); txtPwd.setBounds(130,110,140,25); btnOk.setBounds(130,150,60,25); btnCancle.setBounds(200,150,60,25); p.add(lblRole); p.add(comboBox); p.add(lblName); p.add(txtName); p.add(lblPwd); p.add(txtPwd); p.add(btnOk); p.add(btnCancle); this.add(p); this.setSize(400,300); this.setLocation(300,300); //设置窗体不可改变大小 this.setResizable(false); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); btnOk.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String account =txtName.getText().trim(); String password=txtPwd.getText().trim(); String role=null; if(comboBox.getSelectedItem().equals("管理员")){ role="admin"; } else if(comboBox.getSelectedItem().equals("学生")) { role="student"; } else{ role="teacher"; } if(role.equals("admin")){ User user=new User(account,password); if (DB.Login(user)) { JOptionPane.showMessageDialog(null, "登录成功", "", JOptionPane.PLAIN_MESSAGE); AdminMain adminMain = new AdminMain(); adminMain.setVisible(true); Main.this.setVisible(false); } else { JOptionPane.showMessageDialog(null,"账号密码错误", "", JOptionPane.PLAIN_MESSAGE); } } else if (role.equals("student")){ Student student=new Student(account,password); if(DB.studentLogin(student)){ StudentMain studentMain=new StudentMain(); studentMain.setVisible(true); Main.this.setVisible(false); JOptionPane.showMessageDialog(null, "登录成功", "", JOptionPane.PLAIN_MESSAGE); } else { JOptionPane.showMessageDialog(null,"账号密码错误", "", JOptionPane.PLAIN_MESSAGE); } } else if (role.equals("teacher")){ Teacher teacher=new Teacher(account,password); if(DB.teacherLogin(teacher)){ TeacherMain teacherMain=new TeacherMain(); teacherMain.setVisible(true); Main.this.setVisible(false); JOptionPane.showMessageDialog(null, "登录成功", "", JOptionPane.PLAIN_MESSAGE); } else { JOptionPane.showMessageDialog(null,"账号密码错误", "", JOptionPane.PLAIN_MESSAGE); } } } }); btnCancle.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { } }); } public static void main(String[] args) { // write your code here Main main=new Main(); main.setVisible(true); }}
- 2020-12-12下载
- 积分：1
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