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package jdbcproj;
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import java.sql.*;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.awt.event.ActionEvent;
public class MainFrame extends JFrame {
private JPanel contentPane;
private JTextField txtname;
private JTextField txtpassword;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainFrame frame = new MainFrame();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public MainFrame() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 661, 399);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblNewLabel = new JLabel("\u7528\u6237\u540D");
lblNewLabel.setBounds(114, 51, 72, 18);
contentPane.add(lblNewLabel);
JLabel lblNewLabel_1 = new JLabel("\u5BC6\u7801");
lblNewLabel_1.setBounds(114, 106, 72, 18);
contentPane.add(lblNewLabel_1);
txtname = new JTextField();
txtname.setBounds(261, 48, 86, 24);
contentPane.add(txtname);
txtname.setColumns(10);
txtpassword = new JTextField();
txtpassword.setBounds(261, 103, 86, 24);
contentPane.add(txtpassword);
txtpassword.setColumns(10);
JButton btnadd = new JButton("\u589E\u52A0");
btnadd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(txtname.getText().equals("")||txtpassword.getText().equals(""))
{
JOptionPane.showMessageDialog(getContentPane(), "用户名和密码不能为空","提示信息框",JOptionPane.WARNING_MESSAGE);
}
else{
Users u=new Users();
u.setPwd(txtpassword.getText());
u.setUsername(txtname.getText());
UserDAO usdo=new UserDAO();
usdo.addUser(u);
}
}
});
btnadd.setBounds(45, 205, 113, 27);
contentPane.add(btnadd);
JButton btndelete = new JButton("\u5220\u9664");
btndelete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(txtname.getText().equals(""))
{
JOptionPane.showMessageDialog(getContentPane(), "用户名不能为空","提示信息框",JOptionPane.WARNING_MESSAGE);
}
else{
UserDAO usdo=new UserDAO();
usdo.delUser(txtname.getText());;
}
}
});
btndelete.setBounds(172, 205, 113, 27);
contentPane.add(btndelete);
JButton btnupdate = new JButton("\u4FEE\u6539");
btnupdate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(txtname.getText().equals("")||txtpassword.getText().equals(""))
{
JOptionPane.showMessageDialog(getContentPane(), "用户名和密码不能为空","提示信息框",JOptionPane.WARNING_MESSAGE);
}
else{
Users u=new Users();
u.setPwd(txtpassword.getText());
u.setUsername(txtname.getText());
UserDAO usdo=new UserDAO();
usdo.updateUser(u);;
}
}
});
btnupdate.setBounds(300, 205, 113, 27);
contentPane.add(btnupdate);
JButton btnfind = new JButton("\u67E5\u8BE2");
btnfind.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(txtname.getText().equals(""))
{
JOptionPane.showMessageDialog(getContentPane(), "用户名不能为空","提示信息框",JOptionPane.WARNING_MESSAGE);
}
else{
Users u=new Users();
UserDAO usdo=new UserDAO();
u=usdo.findUser(txtname.getText(), txtpassword.getText());
if(u!=null){
JOptionPane.showMessageDialog(getContentPane(), "该用户存在！","提示信息框",JOptionPane.WARNING_MESSAGE);
}
else{
JOptionPane.showMessageDialog(getContentPane(), "该用户不存在！","提示信息框",JOptionPane.WARNING_MESSAGE);
}
}
}
});
btnfind.setBounds(427, 205, 113, 27);
contentPane.add(btnfind);
//记得要写这个
setVisible(true);
}
}
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Student {
/**
* 学生成绩表
*/
private String name;//学生姓名
private double score;//学生成绩
public Student(){}
public Student(String name,double score){
this.name=name;
this.score=score;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getScore() {
return score;
}
public void setScore(double score) {
this.score = score;
}
//主函数
public static void main(String[] args) {
ListStudent list=new ArrayListStudent();
Student[] stu=new Student[5];
//为学生对象赋值
for(int i=0;i5;i++){
stu[i]=new Student();
Scanner sc=new Scanner(System.in);
System.out.print("请输入学生姓名:");
stu[i].setName(sc.next());
System.out.print("请输入学生成绩:");
stu[i].setScore(sc.nextDouble());
list.add(stu[i]);
}
//打印输出学生成绩表
System.out.println("姓名\t成绩");
for(Student s:list){
System.out.println(s.getName()+"\t"+s.getScore());
}
}
}
import java.util.Scanner;
public class test {
static int s;
public static void main(String[] argv) {
int [] num=new int[20];
Scanner scanner=new Scanner(System.in);
Integer a;
int i;
for(i=1;i=20;i++){
System.out.println("请输入第"+i+"一个分数(结束请输入520嘿嘿)：");
a=scanner.nextInt();
num[i-1]=a;
if(a==520){
break;
}
}
for(int m=0;mi-1;m++)
{
s=s+num[m];
}
System.out.println("总共录入了"+(i-1)+"个分数");
System.out.println("总成绩是"+s+"分");
System.out.println("平均分是"+s/(i-1)+"分");
for(Integer m=0;mnum.length-1;m++)
{ if(num[m]0num[m]!=520){
if(num[m]=90)
System.out.println(num[m]+"优秀");
else if(num[m]=80)
System.out.println(num[m]+"良好");
else if(num[m]=70)
System.out.println(num[m]+"中等");
else if(num[m]=60)
System.out.println(num[m]+"及格");
else
System.out.println(num[m]+"不及格");
}else break;
}
}
}
我的代码很简洁，采纳我呗。。。