Gaurav Gambhir

Thanking you I got the answer in your statement " you should have an application which will run on its own without the GUI "

An application is to be developed that manages the wardens and prisoners at a prison. Each prisoner is identified by a unique number. Details, such as name and number of days left to serve in prison, need to be stored for each prisoner as well as the unique identifier. Some prisoners are categorised as high security prisoners, in which case additional information must be stored, such as security level and whether or not the prisoner can share a cell with another prisoner. Wardens have a rank in the range 1 to 5, where a rank of 5 indicates the highest level of experience. The application must provide the following functionality

1.Add,Find,Delete and Release prisoner
2.Add,Find and Delete warden
3.Check if the prison has an appropriate set of wardens for the current prisoners. The prison should have no less than 1 warden for every 5 prisoners. The prison must have 2 wardens of rank 3 or above for every 4 high security prisoners.

Now question is how in GUI to check if the prison has an appropriate set of wardens for the current prisoners. The prison should have no less than 1 warden for every 5 prisoners. The prison must have 2 wardens of rank 3 or above for every 4 high security prisoners.

Thank you Rob

For the following code
When I run it ,I am getting the image and Login written along with it , but not getting the preselected radio button

import javax.swing.*; public class MyJFrameWithJRadioButton extends JFrame { JRadioButton rdButton; public MyJFrameWithJRadioButton() { setTitle("This is a JFrame"); setBounds(0, 0, 200, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); rdButton =new JRadioButton("Login",new ImageIcon(ClassLoader.getSystemResource("Login.png")),true); add(rdButton); setVisible(true); } public static void main(String args[]) { new MyJFrameWithJRadioButton(); } }

Please suggest the reason for the same

That was really my very silly mistake Thanks alot Michael

Even after making JLabel public doesn't solve my problem as when I run the program I am getting Exception in thread "main" java.lang.NullPointerException

For the following code, I am getting the run time error, Please help

import javax.swing.*; import java.awt.event.*; import java.awt.*; public class FormExample4 { private JFrame f; private JButton ok,cancel; private JPanel top,center,bottom; private Color color1,color2,color3; private JLabel lbltitle,lblname,lbladdress,lblage; private JTextField txtname,txtaddress,txtage; public FormExample4(){ f = new JFrame("Border Layout"); top=new JPanel(); center=new JPanel(); bottom=new JPanel(); ok = new JButton("Add"); cancel = new JButton("Cancel"); color1=new Color(255,0,0); color2=new Color(255,100,210); color3=new Color(125,0,0); lbltitle=new JLabel("Employee Details"); lblname=new JLabel("Name"); lbladdress=new JLabel("Address"); lbladdress=new JLabel("Age"); txtname=new JTextField(); txtaddress=new JTextField(); txtage=new JTextField(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void launchFrame(){ top.add(lbltitle); f.setLayout(new BorderLayout(0,0)); top.setBackground(color1); f.add(top, BorderLayout.NORTH); bottom.setBackground(color2); bottom.add(ok); bottom.add(cancel); f.add(bottom, BorderLayout.SOUTH); center.setBackground(color3); center.setLayout(new GridLayout(3,2)); center.add(lblname); center.add(lbladdress); center.add(lblage); center.add(txtname); center.add(txtaddress); center.add(txtage); f.add(center, BorderLayout.CENTER); f.setSize(200,200); f.setVisible(true); } public static void main(String args[]){ FormExample4 guiWindow2 = new FormExample4(); guiWindow2.launchFrame(); } }

Runtime error is coming for the following lines,

center.setLayout(new GridLayout(3,2)); center.add(lblname); center.add(lbladdress); center.add(lblage); center.add(txtname); center.add(txtaddress); center.add(txtage);

For the following code, I am not getting a checkbox

import javax.swing.*; public class MyJFrameWithJCheckBox extends JFrame { JCheckBox chkBox; public MyJFrameWithJCheckBox() { setTitle("This is a JFrame"); setBounds(0, 0, 200, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Icon icon=new ImageIcon("Login.png"); chkBox =new JCheckBox(icon,true); // chkBox =new JCheckBox(new ImageIcon(ClassLoader.getSystemResource("Login.png"))); add(chkBox); setVisible(true); } public static void main(String args[]) { new MyJFrameWithJCheckBox(); } }

I have Login.png in same folder , when I execute it I get only image without a checkbox. Please help

Many Many Congratulations

Check http://in.sun.com/training/catalog/courses/CX-310-083.xml

Remember

Two instances of the following wrapper objects will always be == when their primitive values are the same:

Boolean
Byte
Character from \u0000 to \u007f (7f is 127 in decimal)
Short and Integer from -128 to 127

When you used the value 128, two separate objects are created that's why the answer is false

By Unique what you mean to say

Many Many Congratulatons

Many Many Congratulations for clearing a really tough Exam

Enthuware, Whizlabs both are equally good,