我的程序运行良好，接下来，我想把它变成一个GUI。我有一个菜单：
System.out.println("Menu: ");
System.out.println("1) Enter Student Grade(s)");
System.out.println("2) View Student Grade(s)");
System.out.println("3) Delete Student Grade(s)");
System.out.println("4) Exit");
我不确定如何将其实现到GUI中。我可能有4个文本字段：名字，姓氏，单位和标记。我可以有一个要删除的按钮，还有一个用于打开“GradeEnter.txt”按钮的按钮。文件或许。同样，我不确定如何将其实现到单独的GUI类中。谁能帮助或让我入手？感谢
代码：
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class ExamGrades {
private static int menu = 0;
private static String firstName = "";
private static String firstNameDelete = "";
private static String lastName = "";
private static String lastNameDelete = "";
private static String unit = "";
private static int examMark = 0;
private static String entry = "";
private static String firstCap = "";
private static String surCap = "";
private static Scanner scan = new Scanner(System.in);
public static BufferedWriter bw;
public static BufferedReader reader;
public static PrintWriter out;
public static File deleteRecord;
public static void setup() {
reader = null;
File deleteRecord = new File("GradeEnter.txt");
try {
reader = new BufferedReader(new FileReader(deleteRecord));
} catch (FileNotFoundException e1) {
System.err.println("No file found");
}
FileWriter grades = null;
try {
grades = new FileWriter("GradeEnter.txt",true);
} catch (IOException e) {
e.printStackTrace();
}
BufferedWriter bw = new BufferedWriter(grades);
out = new PrintWriter(bw);
}
public static void menuActions()
{
System.out.println("Menu: ");
System.out.println("1) Enter Student Grade(s)");
System.out.println("2) View Student Grade(s)");
System.out.println("3) Delete Student Grade(s)");
System.out.println("4) Exit");
menu = scan.nextInt();
switch(menu) {
case 1:
enterGrades();
break;
case 2:
viewGrades();
break;
case 3:
deleteGrades();
break;
case 4:
exitProgram();
break;
default:
menuActions();
}
}
public static void enterGrades()
{
System.out.print("Please enter student first name: ");
firstName = scan.next();
while(!firstName.matches("[-a-zA-Z]*"))
{
System.out.print("Please enter a valid first name: ");
firstName = scan.next();
}
firstCap = firstName.substring(0,1).toUpperCase() + firstName.substring(1);
System.out.print("Please enter student surname: ");
lastName = scan.next();
while(!lastName.matches("[-a-zA-Z]*"))
{
System.out.print("Please enter a valid surname: ");
lastName = scan.next();
}
surCap = lastName.substring(0,1).toUpperCase() + lastName.substring(1);
System.out.print("Please select Subject Unit: ");
unit = scan.next();
System.out.print("Please enter student mark: ");
while (!scan.hasNextInt())
{
System.out.print("Please enter a valid mark: ");
scan.next();
}
examMark = scan.nextInt();
if (examMark < 40)
{
System.out.println("Failed");
}
else if (examMark >= 40 && examMark <= 49)
{
System.out.println("3rd");
}
else if (examMark >= 50 && examMark <= 59)
{
System.out.println("2/2");
}
else if (examMark >= 60 && examMark <= 69)
{
System.out.println("2/1");
}
else if (examMark >= 70 && examMark <= 100)
{
System.out.println("1st");
}
else
{
System.out.println("Invalid Mark");
}
entry = (firstCap + " " + surCap + ", " + unit + ", " + examMark);
out.println(entry);
menuActions();
}
public static void viewGrades() {
int i =1;
String line;
try {
while ((line = reader.readLine()) != null) {
System.out.println(i + ") " + line);
i++;
}
} catch (IOException e) {
System.err.println("Error, found IOException when searching for record " + e.getMessage());
}
menuActions();
}
public static void deleteGrades(){
int i = 1;
String line;
File tempFile = new File("MyTempFile.txt");
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter(tempFile));
} catch (IOException e) {
System.err.println("Error, found IOException when using BufferedWriter " + e.getMessage());
}
System.out.println("Current Entries Stored: ");
i =1;
try {
while ((line = reader.readLine()) != null) {
System.out.println(i + ") " + line);
i++;
}
} catch (IOException e) {
System.err.println("Error, found IOException when searching for record to delete " + e.getMessage());
}
Scanner scanner = new Scanner(System.in);
System.out.print("To delete, please enter student's First Name: ");
firstNameDelete = scanner.nextLine();
System.out.print("Now, please enter student's Surname: ");
lastNameDelete = scanner.nextLine();
try {
reader.close();
} catch (IOException e) {
System.err.println("Error, found IOException when closing closing reader: " + e.getMessage());
}
try {
reader = new BufferedReader(new FileReader(deleteRecord));
} catch (FileNotFoundException e) {
System.err.println("No file found");
}
String currentLine = "";
try {
currentLine = reader.readLine();
} catch (IOException e) {
System.err.println("Error, found IOException when reading current line " + e.getMessage());
}
while(currentLine != null) {
if(!currentLine.contains(firstNameDelete) && !currentLine.contains(lastNameDelete)) {
try {
writer.write(currentLine);
} catch (IOException e) {
System.err.println("Error, found IOException when deleting line " + e.getMessage());
}
try {
writer.newLine();
} catch (IOException e) {
System.err.println("Error, found IOException when writing a new line " + e.getMessage());
}
}
try {
currentLine = reader.readLine();
} catch (IOException e) {
System.err.println("Error, found IOException when reading file " + e.getMessage());
}
}
System.out.print("if name matches, it will be deleted ");
try {
reader.close();
} catch (IOException e1) {
System.err.println("Error, found IOException when closing reader " + e1.getMessage());
}
try {
writer.close();
} catch (IOException e) {
System.err.println("Error, found IOException when closing writer " + e.getMessage());
}
deleteRecord.delete();
tempFile.renameTo(deleteRecord);
scanner.close();
}
public static void exitProgram(){
System.out.println("Thanks for using 'GradeEnter' ");
System.exit(0);
}
public static void main(String[] args) throws Exception {
System.out.println("Welcome to the 'GradeEnter' program! ");
setup();
menuActions();
out.close();
scan.close();
reader.close();
}
}
编辑：GradeEnter.txt看起来像：
Matt Well, Computing, 100
Adam Smith, Computing, 99
以上由名字，姓氏，课程和标记
组成