Java Basic Problems

JTable Java : How to make JTable cells editable or not editable using DefaultTableModel.

December 27, 2010 allaboutbasic

Here is a little solution to make the cells of JTable editable or not editable.

Here I have coded to make the cells of Column-1 not editable but cells of Column-2 and Column-3 are editable.

Code Example:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.table.*;

class SimpleTableTest extends JFrame

{

private JPanel topPanel ;

private JTable table;

private JScrollPane scrollPane;

private String[] columnNames= new String[3];

private String[][] dataValues=new String[3][3] ;

public SimpleTableTest()

{

setTitle(“JTable Cell Not Editable”);

setSize(300,300);

topPanel= new JPanel();

topPanel.setLayout(new BorderLayout());

getContentPane().add(topPanel);

setDefaultCloseOperation(EXIT_ON_CLOSE);

columnNames=new String[] {“Column 1” , “Column 2” , “Column 3”};

dataValues = new String[][] {

{“1″,”2″,”3”},

{“4″,”5″,”6”},

{“7″,”8″,”9”}

};

TableModel model=new myTableModel();

table =new JTable( );

table.setRowHeight(50);

table.setModel(model);

scrollPane=new JScrollPane(table);

topPanel.add(scrollPane,BorderLayout.CENTER);

}

public class myTableModel extends DefaultTableModel

{

myTableModel( )

{

super(dataValues,columnNames);

System.out.println(“Inside myTableModel”);

}

public boolean isCellEditable(int row,int cols)

{

if(cols==0 ){return false;}

//It will make the cells of Column-1 not Editable

return true;

}

public static void main(String args[])

{

SimpleTableTest mainFrame=new SimpleTableTest();

mainFrame.setVisible(true);

}

OUTPUT:

Java Basic Problems

Java:How to make your JTable appear in the whole JFrame Window

December 26, 2010 allaboutbasic

If you want your JTable need to appear in the full page i.e JTable will cover the full JFrame window then just add the below line in your code.

panel.setLayout(new BorderLayout());

Here panel is the JPanel where you will add your JTable

Also you can see “How to add data in JTable using TableModel“

Java Basic Problems

Java:How to count the number of JTable row and column?

December 26, 2010December 26, 2010 allaboutbasic

If you want to count the number of Row and Column of your JTable,then just add the below lines in your code

int noc=table.getColumnCount();

int nor=table.getRowCount();

System.out.println(“Row:”+nor);

Here table is the name of the JTable you declared in your code.

Also you can see “How to add data in JTable without using TableModel“

Java Basic Problems

Java JTextFiled Font: How to show Bangla (Bengali) in JTextField

December 25, 2010 allaboutbasic

Here I have share you a solution to show the Bengali (Bangla) font in java JTextField.

Code Example:

import java.awt.*;

import javax.swing.*;

public class BanglaFont extends JFrame

{

JTextField text2;

public BanglaFont()

{

Font displayFont1=new Font(“SutonnyMJ”, Font.BOLD,15);

setSize(300,200);

setTitle(“JTextField Font”);

setDefaultCloseOperation(EXIT_ON_CLOSE);

JPanel panel=new JPanel();

getContentPane().add(panel);

panel.setLayout(null);

text2=new JTextField(“Kw¤úDUvi”);

text2.setFont(displayFont1);

text2.setBounds(100,40,100,30);

panel.add(text2,BorderLayout.WEST);

}

public static void main(String args[])

{

BanglaFont x=new BanglaFont();

x.setVisible(true);

}

}
OUTPUT:

Java Basic Problems

Java:How to add data to JTable by declaring and using DefaultTableModel.

December 23, 2010December 23, 2010 allaboutbasic

If you want to add data in JTable by using DefaultTableModel then this solution will be helpful for you. But,if you don’t want to use DefaultTablelModel then CLICK HERE.

Code Example:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.table.*;

class SimpleTableTest extends JFrame

{

private JPanel topPanel ;

private JTable table;

private JScrollPane scrollPane;

private String[] columnNames= new String[3];

private String[][] dataValues=new String[3][3] ;

public SimpleTableTest()

{

setTitle(“JTable and DefaultTableModel”);

setSize(300,300);

topPanel= new JPanel();

topPanel.setLayout(new BorderLayout());

getContentPane().add(topPanel);

setDefaultCloseOperation(EXIT_ON_CLOSE);

columnNames=new String[] {“Column 1” , “Column 2” , “Column 3”};

dataValues = new String[][] {

{“1″,”2″,”3”},

{“4″,”5″,”6”},

{“7″,”8″,”9”}

};

TableModel model=new myTableModel(“owntable”);

table =new JTable( );

table.setRowHeight(50);

table.setModel(model);

scrollPane=new JScrollPane(table);

topPanel.add(scrollPane,BorderLayout.CENTER);

}

public class myTableModel extends DefaultTableModel

{

myTableModel(String tname)

{

super(dataValues,columnNames);

System.out.println(“Inside myTableModel”);

}

public boolean isCellEditable(int row,int cols)

{

return true;

}

public static void main(String args[])

{

SimpleTableTest mainFrame=new SimpleTableTest();

mainFrame.setVisible(true);

}

OUTPUT:

Java Basic Problems

Java: How to add data to JTable using the easiest way.

December 23, 2010 allaboutbasic

Here I have shared with you the basic procedure to add data in a JTable without declaring the DefaultTableModel.

Code Example:

import java.awt.*;

import javax.swing.*;

class simpletable extends JFrame

{

private JPanel topPanel;

private JTable table;

private JScrollPane scrollPane;

private String[] columnNames= new String[3];

private String[][] dataValues=new String[3][3] ;

public simpletable()

{

setTitle(“Simple Table Application”);

setSize(300,300);

topPanel= new JPanel();

topPanel.setLayout(new BorderLayout());

getContentPane().add(topPanel);

setDefaultCloseOperation(EXIT_ON_CLOSE);

columnNames=new String[] {“Column 1” , “Column 2” , “Column 3”};

dataValues = new String[][] {

{“1″,”2″,”3”},

{“4″,”5″,”6”},

{“7″,”8″,”9”}

};

table =new JTable(dataValues,columnNames );

table.setRowHeight(50);

scrollPane=new JScrollPane(table);

topPanel.add(scrollPane,BorderLayout.CENTER);

}

public static void main(String args[])

{

simpletable mainFrame=new simpletable();

mainFrame.setVisible(true);

}

OUTPUT:

Java Basic Problems

Java:How to insert a word in the middle and at the last position of a String.

December 23, 2010 allaboutbasic

Here is the solution to insert a word in the middle and at the last position of a string.

class StringManipulation
{
public static void main(String args[])
{
StringBuffer str= new StringBuffer(“Object Language”);
System.out.println(“\n”);
System.out.println(“Original String:”+str);
System.out.println(“\n”);
System.out.println(“Length of String:”+str.length());

for(int i=0;i<str.length();i++)
{
int p=i+1;
System.out.println(“Character at position:”+p+”:is:”+str.charAt(i));

}
String aString=new String(str.toString());
int pos=aString.indexOf(“Language”);
System.out.println(“\n”);

str.insert(pos,”Oriented”);

System.out.println(“Modified string:”+str);
str.setCharAt(6,’-‘);
System.out.println(“\n”);
System.out.println(“String now:”+str);
System.out.println(“\n”);
str.append(“improves security”);
System.out.println(“Appended string:”+str);
}
}

OUTPUT:

Java Basic Problems

Java: How to use image as background icon on JButton

December 22, 2010 allaboutbasic

Here I have shared a way to use image as background icon on JButton.

Code Example:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class simpletest extends JFrame
{

String conversion;

  public simpletest()
  {
  setSize(300,200);
  setTitle(“Button Icon”);
  setDefaultCloseOperation(EXIT_ON_CLOSE);

  ImageIcon iconA = new ImageIcon(“image002.jpg”);
  JPanel panel=new JPanel();
  getContentPane().add(panel);
  panel.setLayout(null);

  JButton beep;
  beep= new JButton(“Click”,iconA);
  beep.setRolloverIcon(iconA);
  beep.setBounds(100,60,120,50);

  panel.add(beep);

  }
          public static void main(String args[])
          {
          simpletest x=new simpletest();
          x.setVisible(true);
          }

}

OUTPUT:

Java Basic Problems

Java: How to find out the position of a character in a String using StringBuffer.

December 22, 2010 allaboutbasic

Here, I want to share you a solution to find out the position of characters in a String using StringBuffer in java.

Code Example:

class StringManipulation

{

public static void main(String args[])

{

StringBuffer str= new StringBuffer(“Software Engineering”);

System.out.println(“\n”);

System.out.println(“Original String:”+str);

System.out.println(“\n”);

System.out.println(“length of String:”+str.length());

System.out.println(“\n”);

for(int i=0;i<str.length();i++)

{

int p=i+1;

System.out.println(“Character at position:”+p+”:is:”+str.charAt(i));

}

System.out.println(“\n”);

}

OUTPUT:

Java Basic Problems

Java: How to know it is AM or PM using Time / DateFormat in java.

December 21, 2010 allaboutbasic

If you are trying to separate the AM or PM from the Time or DateFormat using java, then the following solution will be helpful for you.

Code Example:

import java.text.*;

import java.util.*;

import java.util.StringTokenizer;

class DateFormatDemo {

public static void main(String args[]) {

Date date = new Date();

DateFormat df;

df = DateFormat.getDateInstance(DateFormat.SHORT);

System.out.println(“\n”);

System.out.println(“Short form: ” + df.format(date));

df = DateFormat.getDateInstance(DateFormat.LONG);

System.out.println(“Long form: ” + df.format(date));

System.out.println();

df = DateFormat.getTimeInstance(DateFormat.SHORT);

System.out.println(“Short form: ” + df.format(date));

df = DateFormat.getTimeInstance(DateFormat.LONG);

System.out.println(“Long form: ” + df.format(date));

String daate=df.format(date).toString();

System.out.println(“\n”);

StringTokenizer st_time=new StringTokenizer(daate,” “);

String timeStr[] = new String[7];

int i=0;

while ( st_time.hasMoreElements()) {

timeStr[i++] = st_time.nextToken();

}

System.out.println(“It is AM or PM ?:”+timeStr[1]);

}

OUTPUT: