Initial feeling of java object-oriented thinking
Abstract: The initial feeling of java object-oriented thinking
: / * Create this example, the initial feeling you java object-oriented essence, jtable only used to display, and the use of templates to change jtable properties, the realization of forms and settings from the show * /
Import javax.swing .*;
Import java.awt .*;
Import javax.swing.table .*;
Import java.util .*;
Import java.awt.event .*;
Import javax.swing.table.TableColumn;
Import java.sql .*;
Import sun.jdbc.odbc.JdbcOdbcDriver;
Class Typec extends JFrame
(
/ / Form controls and form
JPanel pnla = null;
JPanel pnlb = null;
JTable table = null;
TestModela md = null;
TestModelb mdb = null;
TableColumn tc = null;
Javax.swing.JComboBox jc = null;
Javax.swing.JCheckBox jboxa = null;
Javax.swing.JCheckBox jboxb = null;
DataBase db = new DataBase (); / / sql data link
Javax.swing.JScrollPane js;
JButton but;
JTextField jt1 = null;
JTextField jt2 = null;
JTextField jt3 = null;
JTextField jt4 = null;
JTextField jt5 = null;
/ / Object array structure jtable
Object [] [] a = new Object [2] [3];
Object [] b = ( "a" and "b" and "c");
/ / Object array structure jtable
Object [] [] = ((aa "a" and "b" and "c"));
/ / Vector array structure jtable
Vector va, vb, vc;
/ / Function to achieve
/ / 1) Object array structure jtable added to the form boost
/ / 2) will be the first out JTable attributes to the text box, the second in the drop-down box to change attributes
Void addObject ()
(
Table = new JTable (a, b);
Tc = new TableColumn ();
Jt1 = new javax.swing.JTextField (10);
Jt1.setBackground (Color.red);
Jc = new JComboBox ();
Jc.addItem ( "M");
Jc.addItem ( "F");
Tc = table.getColumnModel (). GetColumn (1);
Tc.setCellEditor (new DefaultCellEditor (jt1));
Tc = table.getColumnModel (). GetColumn (2);
Tc.setCellEditor (new DefaultCellEditor (jc));
Js = new JScrollPane (table);
This.getContentPane (). Add (js, BorderLayout.CENTER);
This.setSize (700,350); / / must be added after that would not otherwise normal display
This.show ();
)
/ / Function to achieve
/ / 1) Object templates to create JTable
/ / 2) to achieve JTable forms the border and hide and display b specified for the hidden and display
Void addObjectMd ()
(
Pnla = new JPanel ();
Jt1 = new JTextField (10);
But = new JButton ( "to set up high");
But.addActionListener (new butsj ());
Jboxa = new JCheckBox ( "hidden", false);
Jboxa.addItemListener (new MyItemListener ());
Jboxb = new JCheckBox (the "delete", false);
Jboxb.addItemListener (new MyItemListener ());
Pnla.add (jt1);
Pnla.add (but);
Pnla.add (jboxa);
Pnla.add (jboxb);
Md = new TestModela (aa, b) / / templates must be used, there are an array of value
Table = new JTable (md);
Js = new JScrollPane (table);
Pnlb = (JPanel) this.getContentPane ();
Pnlb.setLayout (new BorderLayout ());
Pnlb.add (pnla, BorderLayout.NORTH);
Pnlb.add (js, BorderLayout.CENTER);
This.setSize (700,350); / / must be added after that would not otherwise normal display
This.show ();
)
Void addVector ()
(
Vc = new Vector ();
Vc.add (the "va");
Vc.add ( "vb");
Vc.add ( "vc");
Va = new Vector ();
Va.add (vc);
Vb = new Vector ();
Vb.add (the "va");
Vb.add ( "vb");
Vb.add ( "vc");
Table = new JTable (va, vb);
Js = new JScrollPane (table);
This.getContentPane (). Add (js, BorderLayout.CENTER);
This.setSize (700,350); / / must be added after that would not otherwise normal display
This.show ();
)
Void addVectorMd () / / class template czVector
(
/ / Definition of a data table, the equivalent of a one-dimensional array
Vc = new Vector ();
Vc.add (the "va");
Vc.add ( "vb");
Vc.add ( "vc");
Vc.add (new Boolean (false));
Va = new Vector ();
/ / Data to be generated in to va
Va.add (vc);
Vb = new Vector ();
/ / Definition of the title of JTable
Vb.add (the "va");
Vb.add ( "vb");
Vb.add ( "vc");
Vb.add ( "vd");
Mdb = new TestModelb (va, vb);
Table = new JTable (mdb);
/ / Forms have been completed structure
Js = new JScrollPane (table);
Jt1 = new JTextField (10);
Jt2 = new JTextField (10);
Jt3 = new JTextField (10);
Jt4 = new JTextField (10);
But = new JButton ( "add");
But.addActionListener (new butsj ());
Pnla = new JPanel ();
Pnla.add (jt1);
Pnla.add (jt2);
Pnla.add (jt3);
Pnla.add (jt4);
Pnla.add (but);
Pnlb = (JPanel) this.getContentPane ();
Pnlb.setLayout (new BorderLayout ());
Pnlb.add (pnla, BorderLayout.NORTH);
Pnlb.add (js, BorderLayout.CENTER);
This.setSize (700,350); / / must be added after that would not otherwise normal display
This.show ();
)
Void addVectorSql ()
(
DataBase.FillVector ( "select * from students");
Va = DataBase.data; / / Get a row in the database data
Vb = DataBase.title; / / database access to the title
Mdb = new TestModelb (va, vb);
Table = new JTable (mdb);
Js = new JScrollPane (table);
Pnla = new JPanel ();
Pnlb = (JPanel) this.getContentPane ();
Pnlb.setLayout (new BorderLayout ());
Pnlb.add (pnla, BorderLayout.NORTH);
Pnlb.add (js, BorderLayout.CENTER);
This.setSize (700,350); / / must be added after that would not otherwise normal display
This.show ();
)
/ / / / Click incident
Private class butsj implements ActionListener
(
Public void actionPerformed (ActionEvent e)
(
If ((e.getSource () == but) & & but.getText (). Equals ( "add"))
(
Vc = new Vector ();
Vc.add (jt1.getText ());
Vc.add (jt2.getText ());
Vc.add (jt3.getText ());
Vc.add (new Boolean (jt4.getText (). EqualsIgnoreCase ( "true ")));// this String comparison with another String, and not consider case.
Mdb.AddRow (vc);
)
Else if ((e.getSource () == but) & & but.getText (). Equals ( "to set up high"))
(
Int h = Integer.parseInt (jt1.getText ());// be imported duty
If (h> 0)
Table.setRowHeight (h) / / set up to the high table of
)
)
)
/ / CheckBox elections incident
Private class MyItemListener implements ItemListener
(
Public void itemStateChanged (ItemEvent e)
(
/ / First source of the incident to determine the source judge whether the incident was selected
If (e.getSource () == jboxa)
If (jboxa.isSelected ())
(
/ / Settings are displayed form lines
Table.setShowHorizontalLines (true);
Table.setShowVerticalLines (true);
)
Else
(
Table.setShowHorizontalLines (false);
Table.setShowVerticalLines (false);
)
/ / Delete scores out whether
If (e.getSource () == jboxb)
If (select whether jboxb.isSelected ())//
(
Tc = table.getColumnModel (). GetColumn (2);
Table.getColumnModel (). RemoveColumn (tc);
Table.updateUI ();
)
Else
(
Table.getColumnModel (). AddColumn (tc);
)
)
)
) / / This is the right Typec brackets, not confuse you
/ / Object templates to create jtable
Class TestModela extends javax.swing.table.DefaultTableModel
(
Object [] [] data;
Object [] title;
TestModela (Object [] [] d, Object [] t)
(
Super (d, t);
This.data = d;
This.title = t;
)
Public Object getValueAt (int r, int c)
(
Return data [r] [c] / / c will be r disaggregated data
)
Public Class getColumnClass (int c)
(
/ / Will be different types of data
/ / In the form of correspondence, we can compare this example in the show
/ / And a few examples of the difference between the former
Return data [0] [c]. GetClass ();
)
/ / Set to r, c column values for the value
/ / When the user to amend the data in the JTable, can automatically call, and modify the data in the data
Public void setValueAt (Object value, int r, int c)
(
Data [r] [c] = value;
)
)
/ / Use Vector to create templates jtable
/ / The JTable, it is a two-dimensional structure, the entire data in the table by a Vector
/ / For each row in the table is a Vector
Class TestModelb extends javax.swing.table.DefaultTableModel
(
Vector a;
Vector b;
TestModelb (Vector a, Vector b)
(
Super (a, b);
This.a = a;
This.b = b;
)
Public Object getValueAt (int c, int b) / / by each disaggregated data
(
Vector v = (Vector) a.get (c); / / Retrieve data in the array variable
Return v.get (b); / / are not an every line of the value of
)
Public Class getColumnClass (int c)
(
Vector v = (Vector) a.get (0);
Return v.get (c). GetClass () / / of the string into the types of data
)
Public boolean isCellEditable (int r, int c)
(
/ / In addition to the second column is not to be revised
/ / Other may be amended
If (c == 2)
Return false;
Return true;
)
/ / Custom TableModel in the method of rewriting the AddRow
/ / Add data to a Vector, representing an increase of a record
Public void AddRow (Vector row)
(
A.add (row);
This.fireTableDataChanged ();// notify all interception, all forms of cell line may have changes, if we do not call will not change
)
//??????????????????? How to delete it
)
/ *
/ / In the pubs database built a table students
Create table students (st_xh varchar (10), st_name varchar (10), st_age int)
Insert into students
Values ('1000 0001 ',' Wang ', 25)
Odbc to build a data source test
Link pubs
* /
Class DataBase / / Database Class cz
(
Public static Connection conn = null; / / This is a connection object
Public static ResultSet rs = null; / / This is a record set targets
Public static Statement st = null; / / This is a language of object
Public static PreparedStatement pst = null; / / with the implementation of the sentence according to parameters
Public static CallableStatement cst = null; / / storage implementation process
Public static ResultSetMetaData rsmd = null; / / record set by the original information
Public static Vector data, title, row;
/ / Constructor function in the database to link
Public DataBase ()
(
Data = new Vector ();
Title = new Vector (); / / abnormal capture must be used, otherwise the error procedures
Try (
Class.forName ( "sun.jdbc.odbc.JdbcOdbcDriver");
Conn = DriverManager.getConnection ( "jdbc: odbc: test", "sa", "sa");
St = conn.createStatement ();
) Catch (SQLException e)
(
E.printStackTrace ();
) Catch (Exception e)
(
E.printStackTrace ();
)
)
/ / According to the two strSql to increase data collection
/ / Data stored in each record in the table, each record also Add in a Vector
/ / Title in the storage of information in the table, according to provide ResultSetMetaData
Public static void FillVector (String strSql)
(
Int s;
Int fieldCount;
Try (
Data.clear ();
Title.clear ();
Rs = st.executeQuery (strSql); / / Set the outcome
Rsmd = rs.getMetaData ();// guitar investigation by the original data set
FieldCount = rsmd.getColumnCount ();
While (rs.next ())
(
Row = new Vector ();
For (int i = 0; i
Row.add (rs.getString (i +1));
)
/ / Add a pass on the increase in a false or true
If (Integer.parseInt (row.get (row.size () -1). ToString ())> 60)
Row.add (new Boolean (true));
Else
Row.add (new Boolean (false));
Data.add (row);
System.out.println (data.size ());
)
For (int i = 0; i
Title.add (rsmd.getColumnLabel (i +1));
)
Title.add ( "Pass");
) Catch (SQLException e)
(
E.printStackTrace ();
)
)
)
Class test
(
Public static void main (String args [])
(
Typec tc = new Typec ();
/ / Tc.addObject ();
/ / Tc.addObjectMd ();
/ / Tc.addVector ();
/ / Tc.addVectorMd ();
Tc.addVectorSql ();
)
) Java, java, J2SE, j2se, J2EE, j2ee, J2ME, j2me, ejb, ejb3, JBOSS, jboss, spring, hibernate, jdo, struts, webwork, ajax, AJAX, mysql, MySQL, Oracle, Weblogic, Websphere, scjp , scjd / * create this example, the initial feeling you java-oriented?
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Tags: java object, Object