Experience exceptions : Exceptions « Language Basics « Java

1. Java
2. Language Basics
3. Exceptions

Experience exceptions

          
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.FileInputStream;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class ExceptTest extends JFrame implements ActionListener {
    private double[] a;
  private JRadioButton divideByZeroButton;

  private JRadioButton badCastButton;

  private JRadioButton arrayBoundsButton;

  private JRadioButton nullPointerButton;

  private JRadioButton negSqrtButton;

  private JRadioButton overflowButton;

  private JRadioButton noSuchFileButton;

  private JRadioButton throwUnknownButton;

  public ExceptTest() {
    JPanel p = new JPanel();
    ButtonGroup g = new ButtonGroup();
    p.setLayout(new GridLayout(8, 1));
    divideByZeroButton = addRadioButton("Divide by zero", g, p);
    badCastButton = addRadioButton("Bad cast", g, p);
    arrayBoundsButton = addRadioButton("Array bounds", g, p);
    nullPointerButton = addRadioButton("Null pointer", g, p);
    negSqrtButton = addRadioButton("sqrt(-1)", g, p);
    overflowButton = addRadioButton("Overflow", g, p);
    noSuchFileButton = addRadioButton("No such file", g, p);
    throwUnknownButton = addRadioButton("Throw unknown", g, p);
    getContentPane().add(p);
  }

  private JRadioButton addRadioButton(String s, ButtonGroup g, JPanel p) {
    JRadioButton button = new JRadioButton(s, false);
    button.addActionListener(this);
    g.add(button);
    p.add(button);
    return button;
  }

  public void actionPerformed(ActionEvent evt) {
    try {
      Object source = evt.getSource();
      if (source == divideByZeroButton) {
        a[1] = a[1] / a[1] - a[1];
      } else if (source == badCastButton) {
        Frame f = (Frame) evt.getSource();
      } else if (source == arrayBoundsButton) {
        a[1] = a[10];
      } else if (source == nullPointerButton) {
        Frame f = null;
        f.setSize(200, 200);
      } else if (source == negSqrtButton) {
        a[1] = Math.sqrt(-1);
      } else if (source == overflowButton) {
        a[1] = 1000 * 1000 * 1000 * 1000;
        int n = (int) a[1];
      } else if (source == noSuchFileButton) {
        FileInputStream is = new FileInputStream("Java Source and Support");
      } else if (source == throwUnknownButton) {
        throw new UnknownError();
      }
    } catch (RuntimeException e) {
      System.out.println("Caught RuntimeException: " + e);
    } catch (Exception e) {
      System.out.println("Caught Exception: " + e);
    }
  }

  public static void main(String[] args) {
    JFrame frame = new ExceptTest();
    frame.setSize(150, 200);
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.show();
  }
}
           
         
    
    
    
    
    
    
    
    
    
  

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9.	Turning off Checked exceptions
10.	Demonstrates exception chaining
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13.	Further embellishment of exception classes
14.	The finally clause is always executed
15.	Your own Exception class
16.	Catching exception hierarchies
17.	How an exception can be lost
18.	Exception in main method
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22.	Rethrow a different object from the one that was caught
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28.	Get Deepest Throwable
29.	Make a string representation of the exception
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34.	Convert an exception to a String with full stack trace
35.	Return stack trace from the passed exception as a string
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37.	Create a new Exception, setting the cause if possible.
38.	Set the cause of the Exception. Will detect if this is not allowed.
39.	Get the stack trace of the supplied exception.
40.	Display Stack Trace Information with StackTraceElement
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