java - 如何在 Java 应用程序中包含小程序？

Question

因此，对于我的计算机科学类(class)，我们必须制作一个 GPA 计算器，并在同一程序中包含一个小程序来显示学生的全名及其 GPA。我的程序正在运行

import java.util.*;
import java.text.DecimalFormat;
import javax.swing.JApplet;
import java.awt.*;


public class Project1_Michael_Micool extends JApplet
{
public static void main(String[]args)
{
String first_name, last_name, course1, course2, course3, course4; 
    //Sets all the needed variables to string values for first, last and course names
int cred_course1, cred_course2, cred_course3, cred_course4, total_credits;
    //Sets all the course credits as int values
float grade_course1, grade_course2, grade_course3, grade_course4, grade_point1, grade_point2, grade_point3, grade_point4, total_grades_added, gpa;


Scanner scan = new Scanner(System.in);
DecimalFormat fmt = new DecimalFormat("0.##");


System.out.println("Welcome to the UNG GPA calculator.");

System.out.println();
System.out.println("Please enter your first name");
first_name = scan.next(); //Assigns the entered name as first_name
System.out.println("Please enter your last name");
last_name = scan.next();  //Assigns the entered name as last_name 


System.out.println();
System.out.println("A: 4.0      A-:3.67    ");
System.out.println("B+:3.33     B:3.00    B-:2.67");
System.out.println("C+: 2.33    C:2.00    C-:1.67");
System.out.println("D+: 1.33    D:1.00    F:0.00");


System.out.println();
System.out.println("Please enter your first course name and number. EX: PSYC1101");
course1 = scan.next();
System.out.println("Please enter the number of credits for course 1.");
cred_course1 = scan.nextInt();
System.out.println("Please enter your grade for course 1 using the chart. EX: B+= 3.33");
grade_course1 = scan.nextFloat();    


System.out.println();
System.out.println();
System.out.println("Please enter your second course name and number. EX: PSYC1101");
course2 = scan.next();
System.out.println("Please enter the number of credits for course 2.");
cred_course2 = scan.nextInt();
System.out.println("Please enter your grade for course 2 using the chart. EX: B+= 3.33");
grade_course2 = scan.nextFloat();


System.out.println();
System.out.println();
System.out.println("Please enter your third course name and number. EX: PSYC1101");
course3 = scan.next();
System.out.println("Please enter the number of credits for course 3.");
cred_course3 = scan.nextInt();
System.out.println("Please enter your grade for course 3 using the chart. EX: B+= 3.33");
grade_course3 = scan.nextFloat();


System.out.println();
System.out.println();
System.out.println("Please enter your fourth course name and number. EX: PSYC1101");
course4 = scan.next();
System.out.println("Please enter the number of credits for course 4.");
cred_course4 = scan.nextInt();
System.out.println("Please enter your grade for course 4 using the chart. EX: B+= 3.33");
grade_course4 = scan.nextFloat();


total_credits = cred_course1 + cred_course2 + cred_course3 + cred_course4; 
grade_point1 = grade_course1 * cred_course1; 
grade_point2 = grade_course2 * cred_course2;
grade_point3 = grade_course3 * cred_course3;
grade_point4 = grade_course4 * cred_course4;
total_grades_added = grade_point1 + grade_point2 + grade_point3 + grade_point4;
gpa = total_grades_added / total_credits;
gpa = Math.abs(gpa);


course1 = course1.toUpperCase();
course2 = course2.toUpperCase();
course3 = course3.toUpperCase();
course4 = course4.toUpperCase();


System.out.println("Your name is " + first_name + " " + last_name); 
System.out.println("You are taking " + course1 + " which is worth " + cred_course1 + " credit hours");
System.out.println("You are taking " + course2 + " which is worth " + cred_course2 + " credit hours");
System.out.println("You are taking " + course3 + " which is worth " + cred_course3 + " credit hours");
System.out.println("You are taking " + course4 + " which is worth " + cred_course4 + " credit hours");
System.out.println("Your total credit hours is " + total_credits);
System.out.println("Your GPA is " + fmt.format(gpa));
}
}

这是我认为应该可以工作的小程序。

public void paint(Graphics page)
{
page.drawString(first_name + " " + last_name, 110, 70);
page.drawString(gmt.format(gpa), 130, 100);
}

所以我的问题是，如何将小程序合并到程序中？

Answer 1

您发布的内容不是“小程序”；它只是可能是 AWT 小部件(例如小程序)的 paint 方法。只需在集成到 UI 中的小部件中使用该方法即可。