13518219792
import java.util.Scanner;
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public class Test {
protected static boolean end_flag = true;
public static void main(String[] args) {
Students student = new Students();
student.InputData();// 输入学生数据
String order;
while (end_flag) {
System.out.println("请输入数字1-5:");
Scanner s = new Scanner(System.in);
order = s.nextLine();
student.Operator(order);
}
}
}
Students类：
import java.util.ArrayList;
import java.util.Scanner;
public class Students {
private int STUDENTS_NUM = 5; // 学生的人数
private int SUBJECTS_NUM = 3; // 课程数
private String[][] data = new String[STUDENTS_NUM][SUBJECTS_NUM + 2];
private String name;
private int Chinese_score;
private int Math_score;
private int English_score;
public void SearchHighestScore(String[][] original) { // 查找最高成绩
int flag = Integer.parseInt(original[0][4]), position = 0;
for (int i = 1; i original.length; i++) {
if (Integer.parseInt(original[i][4]) flag) {
flag = Integer.parseInt(original[i][4]);
position = i;
}
}
System.out.print("最高分同学的姓名和总分为:");
System.out.println(original[position][0] + " " + original[position][4]);
}
public void SearchLowestScore(String[][] original) {
int flag = Integer.parseInt(original[0][4]), position = 0;
for (int i = 1; i original.length; i++) {
if (Integer.parseInt(original[i][4]) flag) {
flag = Integer.parseInt(original[i][4]);
position = i;
}
}
System.out.print("最低分同学的姓名和总分为:");
System.out.println(original[position][0] + " " + original[position][4]);
}
public void OrderStudents(String[][] original) {
String[][] result = original;
String temp;
for (int i = 1; i result.length; i++) {
for (int j = 0; j result.length - i; j++) {
if (Integer.parseInt(result[j][4]) Integer
.parseInt(result[j + 1][4])) {
temp = result[j][4];
result[j][4] = result[j + 1][4];
result[j + 1][4] = temp;
temp = result[j][0];
result[j][0] = result[j + 1][0];
result[j + 1][0] = temp;
}
}
}
System.out.println("排名\t" + "姓名\t" + "总分\t");
for (int i = 0; i STUDENTS_NUM; i++) {
System.out.println(i + 1 + "\t" + result[i][0] + "\t"
+ result[i][4]);
}
}
public void ScoreUnder60(String[][] original) {
System.out.println("平均分在60以下的学生的姓名为:");
ArrayList temp = new ArrayList();
for (int i = 0; i original.length; i++) {
if (Integer.parseInt(original[i][4]) / SUBJECTS_NUM 60) {
temp.add(original[i][0]);
}
}
System.out.print(temp + " ");
System.out.println("\n" + "平均分在60以下的学生的人数为:"
+ temp.size());
}
public Integer SearchScore(String student_name) {
int position = -1;
for (int i = 0; i data.length; i++) {
if (student_name.equals(data[i][0])) {
position = i;
}
}
if (position != -1)
return Integer.valueOf(data[position][4]);
else
return null;
}
public void Operator(String order) {
if ("1".equals(order)) {
SearchHighestScore(data);
SearchLowestScore(data);
} else if ("2".equals(order)) {
OrderStudents(data);
} else if ("3".equals(order)) {
ScoreUnder60(data);
} else if ("4".equals(order)) {
String name;
System.out.println("请输入学生的姓名:");
Scanner s = new Scanner(System.in);
name = s.nextLine();
if (SearchScore(name) != null)
System.out.println(name + "的总分为:" + SearchScore(name));
else
System.out.println("查无此人");
} else if ("5".equals(order)) {
Test obj = new Test();
obj.end_flag = false;
System.out.println("退出");
} else {
System.out.println("输入有误！");
}
}
public void InputData() {
for (int i = 1; i = STUDENTS_NUM; i++) {
System.out.print("请输入第" + i + "个人的姓名" + ":");
Scanner s1 = new Scanner(System.in);
name = s1.nextLine();
data[i - 1][0] = name;
System.out.print("请输入第" + i + "个人的语文成绩" + ":");
Scanner s2 = new Scanner(System.in);
Chinese_score = s2.nextInt();
data[i - 1][1] = String.valueOf(Chinese_score);
System.out.print("请输入第" + i + "个人的数学成绩" + ":");
Scanner s3 = new Scanner(System.in);
Math_score = s3.nextInt();
data[i - 1][2] = String.valueOf(Math_score);
System.out.print("请输入第" + i + "个人的英语成绩" + ":");
Scanner s4 = new Scanner(System.in);
English_score = s4.nextInt();
data[i - 1][3] = String.valueOf(English_score);
data[i - 1][4] = String.valueOf(Chinese_score + Math_score
+ English_score);
System.out.println(data[i - 1][4]);
}
}
}
package jdbcproj;
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);
}
}
以下方法实现了用户界面登陆
import java.awt.*;
import java.awt.event.*;
public class DengLuJieMian extends Frame implements ActionListener
{
Label username=new Label("用户名：");//使用文本创建一个用户名标签
TextField t1=new TextField();//创建一个文本框对象
Label password=new Label("密码：");//创建一个密码标签
TextField t2=new TextField();
Button b1=new Button("登陆");//创建登陆按钮
Button b2=new Button("取消");//创建取消按钮
public DengLuJieMian()
{
this.setTitle("学生信息管理系统");//设置窗口标题
this.setLayout(null);//设置窗口布局管理器
username.setBounds(50,40,60,20);//设置姓名标签的初始位置
this.add(username);// 将姓名标签组件添加到容器
t1.setBounds(120,40,80,20);// 设置文本框的初始位置
this.add(t1);// 将文本框组件添加到容器
password.setBounds(50,100,60,20);//密码标签的初始位置
this.add(password);//将密码标签组件添加到容器
t2.setBounds(120,100,80,20);//设置密码标签的初始位置
this.add(t2);//将密码标签组件添加到容器
b1.setBounds(50,150,60,20);//设置登陆按钮的初始位置
this.add(b1);//将登陆按钮组件添加到容器
b2.setBounds(120,150,60,20);//设置取消按钮的初始位置
this.add(b2);// 将取消按钮组件添加到容器
b1.addActionListener(this);//给登陆按钮添加监听器
b2.addActionListener(this);// 给取消按钮添加监听器
this.setVisible(true);//设置窗口的可见性
this.setSize(300,200);//设置窗口的大小
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});//通过内部类重写关闭窗体的方法
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)//处理登陆事件
{
String name=t1.getText();
String pass=t2.getText();
if(name!=nullpass.equals("000123"))//判断语句
{
new StudentJieMian();
}
}
}
public static void main(String args[])//主函数
{
new DengLuJieMian();
}
}
以下方法实现了学生界面设计
import java.awt.*;
import java.awt.event.*;
class StudentJieMian extends Frame implements ActionListener
{
MenuBar m=new MenuBar();//创建菜单栏
Menu m1=new Menu("信息");//创建菜单“信息”
MenuItem m11=new MenuItem("插入");//创建“插入”的菜单项
MenuItem m12=new MenuItem("查询");
Menu m2=new Menu("成绩");//创建菜单“成绩”
MenuItem m21=new MenuItem("查询");
public StudentJieMian()
{
this.setTitle("学生界面");//设置窗口标题
this.setLayout(new CardLayout());//设置窗口布局管理器
this.setMenuBar(m);//将菜单栏组件添加到容器
m.add(m1);//将信息菜单放入菜单栏
m.add(m2);
m1.add(m11);//将“插入”菜单项添加到“信息”菜单
m1.add(m12); //将“查询”菜单项添加到“信息”菜单
m2.add(m21); //将“查询”菜单项添加到“成绩”菜单
m11.addActionListener(this); //给“插入”菜单项添加监听器
m12.addActionListener(this); //给“查询”菜单项添加监听器
m21.addActionListener(this); //给“查询”菜单项添加监听器
this.setVisible(true); //设置窗口的可见性
this.setSize(300,200); //设置窗口的大小
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);//关闭窗口
}
});
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==m11) //处理“添加信息”事件
{
new AddStudent();
}
if(e.getSource()==m12) //处理“查询信息”事件
{
new SelectStudent();
}
if(e.getSource()==m21) //处理“查询成绩”事件
{
new ChengJiStudent();
}
}
public static void main(String args[])
{ new StudentJieMian(); //创建一个对象 }
public static void main(String[] args) {
double scores[] = new double[5];
double total = 0;
double avg = 0;
double max = 0;
double min = 0;
int count=0;
String inputStr=null;
System.out.println("请输入5名学生的成绩：");
Scanner input = new Scanner(System.in);
while(count5){
try{
if(count 5){
System.out.println("请输入第"+(count+1)+"个分数：");
}
inputStr=input.nextLine();
scores[count++]=Double.valueOf(inputStr.trim());
}catch(Exception e){
if(inputStr!=null "exit".equals(inputStr.trim())){
System.out.println("您已成功结束程序");
System.exit(0);
}
System.out.println("若想结束请输入：exit");
System.out.print("您输入的分数不是数值类型，");
count--;
}
}
input.close();
Arrays.sort(scores);
min=scores[0];
max=scores[scores.length-1];
for(double score :scores){
total += score;
}
avg=total/scores.length;
System.out.println("总成绩是" + total);
System.out.println("最高分是" + max);
System.out.println("最低分是" + min);
System.out.println("平均分是" + avg);
}
//-------------------------------------------------------------------------
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
while(true){
Double[] scores = null;
double total = 0;
double avg = 0;
double max = 0;
double min = 0;
int count=1;
ListDouble inputScores=new ArrayListDouble();
String inputStr=null;
System.out.println("请输入要统计学生的成绩（理论上可以输入无限个，前提是你有那么大的内存）：");
while(true){
try{
System.out.println("请输入第"+count+++"个分数，或输入ok进行计算，离开请输入exit");
inputStr=input.nextLine();
inputScores.add((double)Double.valueOf(inputStr.trim()));
}catch(Exception e){
if(inputStr!=null "exit".equals(inputStr.trim().toLowerCase())){
System.out.println("您已成功结束程序");
input.close();
System.exit(0);
}
if(inputStr!=null "ok".equals(inputStr.trim().toLowerCase())){
break;
}
System.out.println("您输入的分数不是数值类型，");
System.out.println("若想结束请输入exit ，若想计算结果请输入ok");
count--;
}
}
if(inputScores.size()==0){
System.out.println("您没有输入学生成绩，无数据可统计，程序结束。");
return ;
}
scores=inputScores.toArray(new Double[inputScores.size()]);
Arrays.sort(scores);
min=scores[0];
max=scores[scores.length-1];
for(double score :scores){
total += score;
}
avg=total/scores.length;
System.out.println("总成绩是" + total);
System.out.println("最高分是" + max);
System.out.println("最低分是" + min);
System.out.println("平均分是" + avg);
}
}
