englishstudent1.java

这是JAVA入门程序

import javax.swing.JOptionPane;

class EnglishStudent1{
	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;
	
	private int midterm = 0;
	private int finalExam = 0;
	private int research = 0;
	private int presentation = 0;
	private double finalNumericGrade = 0;
	private String finalLetterGrade = "";
	
	public EnglishStudent1()
	{
		System.out.println("EnglishStudent's constructors");			
	}
	
	public void setMidterm(int temp)
	{
		if(temp<0 | temp>100)
		{
			JOptionPane.showMessageDialog(null,"Invalid Midterm Grade("+temp+")"+"Program Terminating");
			System.exit(0);
		}
		else
			midterm = temp;
	}
	
	public int getMidterm()
	{
		return midterm;	
	}
	
	public void setFinalExam(int temp)
	{
			if(temp < 0 | temp > 100)
			{
					JOptionPane.showMessageDialog(null,"Invalid finalExam Grade("+temp+")"+"Program Terminating");
			System.exit(0);
		  }
		  else
			finalExam = temp;
			
	}
	
	public int getFinalExam()
	{
		return finalExam;	
	}
	
	public void setResearch(int temp)
	{
			if(temp < 0 | temp > 100)
			{
					JOptionPane.showMessageDialog(null,"Invalid finalExam Grade("+temp+")"+"Program Terminating");
			System.exit(0);
		  }
		  else
			research = temp;
			
	}
	
	public int getResearch()
	{
		return research;	
	}
	
	public void setPresentation(int temp)
	{
			if(temp < 0 | temp > 100)
			{
					JOptionPane.showMessageDialog(null,"Invalid finalExam Grade("+temp+")"+"Program Terminating");
			System.exit(0);
		  }
		  else
			presentation = temp;
			
	}
	
	public int getPresentation()
	{
		return presentation;	
	}
	
	public double getFinalNumericGrade()
	{
		return finalNumericGrade;	
	}
	
	public String getFinalLetterGrade()
	{
		return finalLetterGrade;	
	}
	
	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";			
	}	
}