calculatebuttonlistener.java.bak

这是JAVA入门程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CalculateButtonListener implements ActionListener
{
	DrawGUI x;
	
	CalculateButtonListener(DrawGUI a)
	{
		x = a;		
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if(x.lblStudentType.getText() == "ENGLISH STUDENT")
		{
			EnglishStudent3 eStudent = new EnglishStudent3();
			eStudent.calculate(Integer.parseInt(x.txtMidterm.getText()),
			                   Integer.parseInt(x.txtFinalExam.getText()),
			                   Integer.parseInt(x.txtResearch.getText()),
			                   Integer.parseInt(x.txtPresentation.getText()));
			x.lblFinalGrade.setText("Numeric Grade:\n"+eStudent.getFinalNumericGrade()+
			                        "Letter Grade:"+eStudent.getFinalLetterGrade());		
		}
		
		if(x.lblStudentType.getText() == "MATH STUDENT")
		{
				MathStudent3 mStudent = new MathStudent3();
				mStudent.calculate(Integer.parseInt(x.txtMidterm.getText()),
			                   Integer.parseInt(x.txtFinalExam.getText()));
			  x.lblFinalGrade.setText("Numeric Grade:\n"+mStudent.getFinalNumericGrade()+
			                        "Letter Grade:"+mStudent.getFinalLetterGrade());
		}
		
		if(x.lblStudentType.getText() == "SCIENCE STUDENT")
		{
				ScienceStudent3 sStudent = new ScienceStudent3();
				sStudent.calculate(Integer.parseInt(x.txtMidterm.getText()),
			                   Integer.parseInt(x.txtFinalExam.getText()),
			                   Integer.parseInt(x.txtResearch.getText()));
			  x.lblFinalGrade.setText("Numeric Grade:\n\n"+sStudent.getFinalNumericGrade()+
			                        "Letter Grade:"+sStudent.getFinalLetterGrade());
		}
	}
}