Java Coding Problems - Improve your Java Programming skills by solving real-world coding challenges.epub
The super-fast evolution of the JDK between versions 8 and 12 has increased the learning curve of modern Java, therefore has increased the time needed for placing developers in the Plateau of Productivity. Its new features and concepts can be adopted to solve a variety of modern-day problems. This book enables you to adopt an objective approach to common problems by explaining the correct practices and decisions with respect to complexity, performance, readability, and more.Java Coding Problems will help you complete your daily tasks and meet deadlines. You can count on the 300 applications containing 1,000 examples in this book to cover the common and fundamental areas of interest: strings, numbers, arrays, collections, data structures, date and time, immutability, type inference, Optional, Java I/O, Java Reflection, functional programming, concurrency and the HTTP
- 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
