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JAVA成绩测评程序代码 java成绩测评程序代码有哪些( 二 )

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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);
}
}
java计算成绩的程序public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
System.out.print("请输入你要计算的科目数：");
int number = scan.nextInt();
float total = 0;
float[] scores = new float[number];
for (int i = 0 ; inumber ; i ++) {
System.out.print("请输入第" + (i + 1) + "门成绩：");
float score = scan.nextFloat();
scores[i] = score;
total += score;
}
System.out.println("您的各科成绩如下：");
for (int i = 0 ; inumber ; i ++) {
System.out.println((i + 1) + ":" + scores[i]);
}
System.out.println("您的总分为:" + total);
System.out.println("平均分为:" + total/number);
}
编写java程序,输入10个成绩,计算最高分,最低分,平均分,并按从小到大排序,最后统计高于平均分的人有多少？代码如下JAVA成绩测评程序代码：
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class App20 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
ListFloat scores = new ArrayList();
System.out.println("请输入10个人JAVA成绩测评程序代码的成绩JAVA成绩测评程序代码：");
for (int i = 0; i10; i++) {
scores.add(scanner.nextFloat());
}
float max = scores.stream().max((x, y) - Float.compare(x, y)).get();
System.out.println("最高分：" + max);
float min = scores.stream().min((x, y) - Float.compare(x, y)).get();
System.out.println("最低分：" + min);
float average = scores.stream().reduce(0.0f, Float::sum) / scores.size();
System.out.println("平均分：" + average);
scores.sort((x, y) - Float.compare(x, y));
System.out.println("从小到大分数排序：");
scores.forEach(s - System.out.print(s + " "));
long n = scores.stream().filter(r - raverage).count();

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