sciencestudent1.java

这是JAVA入门程序

import javax.swing.JOptionPane;

public class ScienceStudent1{
	private final double SCIENCE_MIDTERM_PERCENTAGE = .40;
	private final double SCIENCE_FINALEXAM_PERCENTAGE = .40;
	private final double SCIENCE_RESEARCH_PERCENTAGE = .20;
	
	private int midterm = 0;
	private int finalExam = 0;
	private int research = 0;
	private double finalNumericGrade = 0;
	private String finalLetterGrade = "";
	
	public ScienceStudent1()
	{
		System.out.println("ScienceStudent's constructor");
	}
	
	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 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:"));
								
		finalNumericGrade = (midterm*SCIENCE_MIDTERM_PERCENTAGE)+(finalExam*SCIENCE_FINALEXAM_PERCENTAGE)+
																		(research*SCIENCE_RESEARCH_PERCENTAGE);
								
		if (finalNumericGrade >= 90)
			finalLetterGrade = "A";
		else
		if((finalNumericGrade >=80)&(finalNumericGrade < 90))
			finalLetterGrade = "B";
		else
		if((finalNumericGrade >=70) & (finalNumericGrade < 80))
			finalLetterGrade = "C";
		else
		if((finalNumericGrade >= 60)&(finalNumericGrade < 70))
			finalLetterGrade = "D";
		else
			finalLetterGrade = "F";	
	}	
}