englishstudent3.java

这是JAVA入门程序

import javax.swing.JOptionPane;

class EnglishStudent3 extends Student{
	private final double ENGLISH_MIDTERM_PERCENTAGE = .25;
	private final double ENGLISH_FINALEXAM_PERCENTAGE = .25;
	private final double ENGLISH_RESEARCH_PERCENTAGE = .30;
	private final double ENGLISH_PRESENTATION_PERCENTAGE = .20;	
	
	
	public EnglishStudent3()
	{
		System.out.println("EnglishStudent's constructors");			
	}
	
	public void calculate(int midterm,int finalExam,int research,int presentation)
	{
		
		
		finalNumericGrade = (midterm*ENGLISH_MIDTERM_PERCENTAGE)+
																	(finalExam*ENGLISH_FINALEXAM_PERCENTAGE)+
																	(research*ENGLISH_RESEARCH_PERCENTAGE)+
																	(presentation*ENGLISH_PRESENTATION_PERCENTAGE);
		if(finalNumericGrade >= 93)
			finalLetterGrade = "A";
		else if((finalNumericGrade >= 85)&(finalNumericGrade < 93))
			finalLetterGrade = "B";
		else if((finalNumericGrade >= 78)&(finalNumericGrade < 85))
			finalLetterGrade = "C";
		else if((finalNumericGrade >= 70)&(finalNumericGrade < 78))
			finalLetterGrade = "D";
		else
			finalLetterGrade = "F";			
	}	
	
	public void calculate()
	{
		midterm = Integer.parseInt(JOptionPane.showInputDialog("Enter the Midterm grade:"));
		finalExam = Integer.parseInt(JOptionPane.showInputDialog("Enter the final exam grade:"));
		research = Integer.parseInt(JOptionPane.showInputDialog("Enter the research grade:"));
		presentation = Integer.parseInt(JOptionPane.showInputDialog("Enter the presentation grade:"));
		
		finalNumericGrade = (midterm*ENGLISH_MIDTERM_PERCENTAGE)+
																	(finalExam*ENGLISH_FINALEXAM_PERCENTAGE)+
																	(research*ENGLISH_RESEARCH_PERCENTAGE)+
																	(presentation*ENGLISH_PRESENTATION_PERCENTAGE);
		if(finalNumericGrade >= 93)
			finalLetterGrade = "A";
		else if((finalNumericGrade >= 85)&(finalNumericGrade < 93))
			finalLetterGrade = "B";
		else if((finalNumericGrade >= 78)&(finalNumericGrade < 85))
			finalLetterGrade = "C";
		else if((finalNumericGrade >= 70)&(finalNumericGrade < 78))
			finalLetterGrade = "D";
		else
			finalLetterGrade = "F";			
	}	
}