informationsystem.java

学生成绩修改编辑查询功能界面 此程式是个简单的成绩编辑器 可供读者使用来录入

				GradeText.setText("A");
			else if ( mark_int <= 69 && mark_int >= 67)
				GradeText.setText("A-");
			else if ( mark_int <= 66 && mark_int >= 63)
				GradeText.setText("B+");
			else if ( mark_int <= 62 && mark_int >= 60)
				GradeText.setText("B");
			else if ( mark_int <= 59 && mark_int >= 57)
				GradeText.setText("B-");
			else if ( mark_int <= 56 && mark_int >= 53)
				GradeText.setText("C+");
			else if ( mark_int <= 52 && mark_int >= 50)
				GradeText.setText("C");
			else if ( mark_int <= 49 && mark_int >= 47)
				GradeText.setText("C-");
			else if ( mark_int <= 46 && mark_int >= 43)
				GradeText.setText("D+");
			else if ( mark_int <= 42 && mark_int >= 40)
				GradeText.setText("D");
			else if ( mark_int <= 39 && mark_int >= 35)
				GradeText.setText("E");
			else if ( mark_int <= 34 && mark_int >= 0)
				GradeText.setText("F");
			else
				GradeText.setText("Out of Range");
		}
		catch (NumberFormatException nfe)
		{
			GradeText.setText("Error");
		}
 	}

 	private void ClearBTN_actionPerformed(ActionEvent e)
 	{
 		NameText.setText("");
		MarksText.setText("");
		GradeText.setText("");
 	}

 	private void SaveBTN_actionPerformed(ActionEvent e)
 	{
		int location_int = Integer.parseInt(location);

		for (int x = 0; x < (location_int-1); x++)
		{
			tempData[x][0] = arrayData[x][0];
			tempData[x][1] = arrayData[x][1];
			tempData[x][2] = arrayData[x][2];
		}

		arrayData = new String[location_int][3];

		for (int x = 0; x < (location_int-1); x++)
		{
			arrayData[x][0] = tempData[x][0];
			arrayData[x][1] = tempData[x][1];
			arrayData[x][2] = tempData[x][2];
		}

		tempData = new String[location_int][3];

		if ((NameText.getText()).equals(""))
			JOptionPane.showMessageDialog(null, "Name cannot be blank.\nPlease reenter the name to continue.", "Error", JOptionPane.ERROR_MESSAGE);

		else if ((GradeText.getText()).equals("Out of Range") || (GradeText.getText()).equals("Error") || (GradeText.getText()).equals(""))
			JOptionPane.showMessageDialog(null, "The marks are entered incorrectly or left blank.\nPlease reenter the marks to continue.", "Error", JOptionPane.ERROR_MESSAGE);

		else
		{
			arrayData [(location_int-1)][0] = NameText.getText();
			arrayData [(location_int-1)][1] = MarksText.getText();
			arrayData [(location_int-1)][2] = GradeText.getText();
			IDText_UN.setText(location);
			NameText_UN.setText(arrayData[(location_int-1)][0]);
			MarksText_UN.setText(arrayData[(location_int-1)][1]);
			GradeText_UN.setText(arrayData[(location_int-1)][2]);

			location_int++;
			location = Integer.toString(location_int);
			temp_location = Integer.parseInt(location);
			temp_location = temp_location - 2;
			IDText.setText(location);
 			NameText.setText("");
			MarksText.setText("");
			GradeText.setText("");
		}
 	}

 	private void PreviousBTN_actionPerformed(ActionEvent e)
 	{
		int IDText_UN_int = Integer.parseInt(IDText_UN.getText());
		if (IDText_UN_int == (Integer.parseInt(location)-(Integer.parseInt(location)-1)))
			JOptionPane.showMessageDialog(null, "This is the first record!", "Error", JOptionPane.ERROR_MESSAGE);
		else
		{
			temp_location = temp_location - 1;
			IDText_UN.setText(Integer.toString(IDText_UN_int-1));
			NameText_UN.setText(arrayData[(temp_location)][0]);
			MarksText_UN.setText(arrayData[(temp_location)][1]);
			GradeText_UN.setText(arrayData[(temp_location)][2]);
		}
 	}

 	private void NextBTN_actionPerformed(ActionEvent e)
 	{
		int IDText_UN_int = Integer.parseInt(IDText_UN.getText());
		try
		{
			if (IDText_UN_int == (Integer.parseInt(location)-1))
				JOptionPane.showMessageDialog(null, "This is the last record!", "Error", JOptionPane.ERROR_MESSAGE);
			else
			{
				temp_location = temp_location + 1;
				IDText_UN.setText(Integer.toString(IDText_UN_int+1));
				NameText_UN.setText(arrayData[(temp_location)][0]);
				MarksText_UN.setText(arrayData[(temp_location)][1]);
				GradeText_UN.setText(arrayData[(temp_location)][2]);
			}
		}
		catch (ArrayIndexOutOfBoundsException aioobe)
		{
			JOptionPane.showMessageDialog(null, "This is the last record!", "Error", JOptionPane.ERROR_MESSAGE);
			IDText_UN.setText(Integer.toString(IDText_UN_int));
		}
 	}

 	private void SearchBTN_actionPerformed(ActionEvent e)
 	{
		Object o = TypeCombo.getSelectedItem();
		int x, y, counter;
		String comboString = o.toString(), searchString = SearchText.getText();

		if (searchString.equals(""))
		{
			JOptionPane.showMessageDialog(null, "You must input a value!", "Error", JOptionPane.ERROR_MESSAGE);
		}

		else
		{
			try
			{
				if (comboString.equals("Name (Case Sensitive)"))
				{
					counter = 0;
					for (x = 0; x < arrayData.length; x++)
					{
						if ((arrayData[x][0]).contains(searchString))
							counter = counter + 1;
					}

					if (counter != 0)
					{
						JOptionPane.showMessageDialog(null, "Results found: " + counter, "Name Result", JOptionPane.INFORMATION_MESSAGE);
						ResultLabel.setText("Results found: " + counter);
						searchArrayLocation = new int[counter];

						y = 0;
						for (x = 0; x < arrayData.length; x++)
						{
							if ((arrayData[x][0]).contains(searchString))
							{
								searchArrayLocation[y] = x;
								y++;
							}
						}
					}

					else if (counter == 0)
					{
						JOptionPane.showMessageDialog(null, "There are no results found.", "Name Result", JOptionPane.INFORMATION_MESSAGE);
						ResultLabel.setText("No results found.");

					}
				}

				else if (comboString.equals("Marks"))
				{
					counter = 0;
					for (x = 0; x < arrayData.length; x++)
					{
						if ((arrayData[x][1]).contains(searchString))
							counter = counter + 1;
					}

					if (counter != 0)
					{
						JOptionPane.showMessageDialog(null, "Results found: " + counter, "Marks Result", JOptionPane.INFORMATION_MESSAGE);
						ResultLabel.setText("Results found: " + counter);
						searchArrayLocation = new int[counter];

						y = 0;
						for (x = 0; x < arrayData.length; x++)
						{
							if ((arrayData[x][1]).contains(searchString))
							{
								searchArrayLocation[y] = x;
								y++;
							}
						}
					}

					else if (counter == 0)
					{
						JOptionPane.showMessageDialog(null, "There are no results found.", "Marks Result", JOptionPane.INFORMATION_MESSAGE);
						ResultLabel.setText("No results found.");
					}
				}

				else if (comboString.equals("Grade (Case Sensitive)"))
				{
					counter = 0;
					for (x = 0; x < arrayData.length; x++)
					{
						if ((arrayData[x][2]).contains(searchString))
							counter = counter + 1;
					}

					if (counter != 0)
					{
						JOptionPane.showMessageDialog(null, "Results found: " + counter, "Grade Result", JOptionPane.INFORMATION_MESSAGE);
						ResultLabel.setText("Results found: " + counter);
						searchArrayLocation = new int[counter];

						y = 0;
						for (x = 0; x < arrayData.length; x++)
						{
							if ((arrayData[x][2]).contains(searchString))
							{
								searchArrayLocation[y] = x;
								y++;
							}
						}
					}

					else if (counter == 0)
					{
						JOptionPane.showMessageDialog(null, "There are no results found.", "Grade Result", JOptionPane.INFORMATION_MESSAGE);
						ResultLabel.setText("No results found.");
					}
				}
			}

			catch (NullPointerException npe)
			{
				JOptionPane.showMessageDialog(null, "There are no values in the database.", "Error", JOptionPane.ERROR_MESSAGE);
			}
		}
 	}

 	public static void main(String[] args)
 	{
 		new InformationSystem();
 	}
}