gradesystempanel.java

简单的学生信息管理系统

/**
 * <p>Title:Student Grade System</p>
 * <p>Discrition:</p>
 * <p>Copyright: [e-mail] Copyright (c) 2003.1.3</p>
 * <p>Company:</p>
 *@autor lifeng
 *@version 1.0  
 */
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class GradeSystemPanel extends JPanel
{
	private JLabel Title;//show the title
	private JPanel LayPanel;//Layout the title pane
	private JLabel NamLabel;//show name message
	private JTextField NamText;//input name text field
	private JLabel NumLabel;//show number message
	private JTextField NumText;//input number text field
	private JLabel GradLabel;//show grade message
	private JTextField GradText;//input grade text field
	private JTextArea ShowArea;//show the message area
	private JTextArea ResuArea;//show the result area
	private JPanel BtnPanel;//layout the button pane
	private JButton AddBtn;//add button
	private JButton DelBtn;//delete button
	private JButton SeaBtn;//search button
	private JButton ChangBtn;//change button
	private JButton CouBtn;//count the average and total grade button
	private JScrollPane ShowScrollPane;//a scroll pane on ShowArea
	private JScrollPane ResuScrollPane;//a scroll pane on ResuArea
	private int num = 0;//count the student number
	private String[][] StudMess= new String[10][10];//a temp array of student
	
	public GradeSystemPanel()
	{
		setLayout(new BorderLayout());
		//new a label for show the title
		Title = new JLabel("成绩系统",JLabel.CENTER);
		add(Title,BorderLayout.NORTH);
		//new a panel for lay out the name and number and grade
		LayPanel = new JPanel(new GridLayout(4,2));
		//new a label for show the name
		NamLabel = new JLabel("姓名");
		LayPanel.add(NamLabel);
		//new a text field for input the name
		NamText = new JTextField("",10);
		LayPanel.add(NamText);
		//new a label for show the number of student
		NumLabel = new JLabel("学号");
		LayPanel.add(NumLabel);
		//new a text field for input the number of student
		NumText = new JTextField("",10);
		LayPanel.add(NumText);
		//new a label of show the grade of student
		GradLabel = new JLabel("成绩");
		LayPanel.add(GradLabel);
		//new a text field for input the grade of student
		GradText = new JTextField("",10);
		LayPanel.add(GradText);
		//new a text area for show the all student message 
		ShowArea = new JTextArea();
		//new a scroll pane on the ShowArea
		ShowScrollPane = new JScrollPane(ShowArea);
		ShowArea.append(" name         number        grade\n");
		LayPanel.add(ShowScrollPane);
		//new a text area for show the search and average result
		ResuArea = new JTextArea();
		//new a scroll pane on ResuArea
		ResuScrollPane = new JScrollPane(ResuArea);
		LayPanel.add(ResuScrollPane);
		//add the panel
		add(LayPanel,BorderLayout.CENTER);
		//new a panel for lay out the button
		BtnPanel = new JPanel();
		//new a add button
		AddBtn = new JButton("添加");
		BtnPanel.add(AddBtn);
		//new a delete button
		DelBtn = new JButton("删除");
		BtnPanel.add(DelBtn);
		//new a search button
		SeaBtn = new JButton("查询");
		BtnPanel.add(SeaBtn);
		//new a change the student message button
		ChangBtn = new JButton("修改");
	    BtnPanel.add(ChangBtn);
		//new a cout the all student average button
		CouBtn = new JButton("算平均分");
		BtnPanel.add(CouBtn);
		add(BtnPanel,BorderLayout.SOUTH);
		//add the button action
		//first is addition button action event
		AddBtn.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent event)
			{
				//add message function
				AddMessage();
				NamText.setText("");//clear the NameText
				NumText.setText("");//clear the NumText
				GradText.setText("");//clear the GradText
			}
		});
		//second is searching button action event
		SeaBtn.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent event)
			{
				//clear the ResuArea
				ResuArea.setText("");
				//Searching message function
				SearchMess();
			}
		});
		//third is deleting button action event
		DelBtn.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent event)
			{
				//deleting message funtion
				DeletMess();
			}
		});
		//four is changeing button action event
		ChangBtn.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent evet)
			{
				//changing message function
				ChangeMess();
			}
		});
		//last is count the average button action event
		CouBtn.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent event)
			{
				//clear the ResuArea 
				ResuArea.setText("");
				//Counting the average and total grade function
				CountAver();
			}
		});
	}
	//add the student message function
    public void AddMessage()
	{
		String StrMess = new String();
		//add the student message 
		if(!NamText.getText().equals("")&&!NumText.getText().equals("")&&!GradText.getText().equals(""))
		{
			//add the message
			StrMess = NamText.getText()+"      "+NumText.getText()+"       "+GradText.getText()+"\n";  
			StudMess[num][0] = NamText.getText();//add the name in StudMess
			StudMess[num][1] = NumText.getText();//add the number in StudMess
			StudMess[num][2] = GradText.getText();//add the grade in StudMess
			num++;
        }
        //show the message in show area
        ShowArea.append(StrMess);	
	}
	//search the student message function
	public void SearchMess()
	{
		//input searching name in this box
		String SeaNam = JOptionPane.showInputDialog("Input you want to search name?");
		String StrMess = new String();
		//search the searching name
		for(int i=0;i<num;i++)
		{
			if(SeaNam.equalsIgnoreCase(StudMess[i][0]))
		    StrMess = StudMess[i][0]+"       "+StudMess[i][1]+"       "+StudMess[i][2]+"\n";
	    }
	    //show the searching name message in Result area
	    ResuArea.append(StrMess);
	}
	//delete the student message function
	public void DeletMess()
	{
		//input deleting name in this box
		String DeletNam = JOptionPane.showInputDialog("Input you want to delete name?");
		String StrMess = new String();
		//search the deleting name
		for (int i=0;i<num;i++)
		{
			if(DeletNam.equalsIgnoreCase(StudMess[i][0]))
			{
				for(int k=i;k<num-1;k++)
			    {
			    	//move last number to prefer
			    	StudMess[i][0]=StudMess[i+1][0];
			    	StudMess[i][1]=StudMess[i+1][1];
			    	StudMess[i][2]=StudMess[i+1][2];
			    	StudMess[i][3]=StudMess[i+1][3];
			    }
			    //the number delete 1
			    num--;
			}
		}
		//clear the Show area
		ShowArea.setText("");
		//update new date
		ShowArea.append(" name         number           grade\n");
		for(int i=0;i<num;i++)
		{
			StrMess = StudMess[i][0]+"      "+StudMess[i][1]+"       "+StudMess[i][2]+"\n";
		    //show the new message
		    ShowArea.append(StrMess);
		}
	}
	//change the student message function
	public void ChangeMess()
	{
		//input the changing name
		String ChangNam = JOptionPane.showInputDialog("Input you want to change naem?");
		for(int i=0;i<num;i++)
		{
			if(ChangNam.equalsIgnoreCase(StudMess[i][0]))
			{
				//input the new name
				String NewNam = JOptionPane.showInputDialog("Input the new name?");
				StudMess[i][0] = NewNam;
				//input the new number
				String NewNum = JOptionPane.showInputDialog("Input the new number?");
				StudMess[i][1] = NewNum;
				//input the new grade
				String NewGrad = JOptionPane.showInputDialog("Input the new grade?");
				StudMess[i][2] = NewGrad;
			}
		}
		String StrMess = new String();
		//clear the Show area
		ShowArea.setText("");
		//update new date
		ShowArea.append(" name         number           grade\n");
		for(int i=0;i<num;i++)
		{
			StrMess = StudMess[i][0]+"      "+StudMess[i][1]+"       "+StudMess[i][2]+"\n";
		    //show the new message
		    ShowArea.append(StrMess);
		}
	}
	//count the student message function
	public void CountAver()
	{
		//init the total grade;
		int total = 0;
		//count the total grade
		for(int i=0;i<num;i++)
		{
			total +=Integer.parseInt(StudMess[i][2]);
		} 
		//show  the student number
		ResuArea.append("student total number is :"+num+"\n");
		//show the all students' total grade 
		ResuArea.append("total grade is :"+total+"\n");
		//show the all students' average grade
		ResuArea.append("average grade is :"+total/num+"\n");
	}
}