mathstudent2.java

这是JAVA入门程序

import javax.swing.JOptionPane;

class MathStudent2 extends Student{
	private final double MATH_MIDTERM_PERCENTAGE = .50;
	private final double MATH_FINALEXAM_PERCENTAGE = .50;	
	
	public MathStudent2()
	{
		System.out.println("MathStudent's constructor");	
	}
		
	
	public void calculate()
	{
		midterm = Integer.parseInt(JOptionPane.showInputDialog("Enter the midterm grade:"));										
		finalExam = Integer.parseInt(JOptionPane.showInputDialog("Enter the final exam grade:"));
								
		finalNumericGrade = (midterm*MATH_MIDTERM_PERCENTAGE)+(finalExam*MATH_FINALEXAM_PERCENTAGE);
								
		if(finalNumericGrade > 90)
			finalLetterGrade = "A";
		else if((finalNumericGrade >= 83)&(finalNumericGrade < 90))
			finalLetterGrade = "B";
		else if((finalNumericGrade >= 76)&(finalNumericGrade < 83))
		  finalLetterGrade = "C";
		else if((finalNumericGrade >= 65)&(finalNumericGrade < 76))
			finalLetterGrade = "D";
		else 
			finalLetterGrade = "F";	
	}
}