Chapter 12
The java.lang Package

Exception

Name

Exception

Synopsis

Class Name:

java.lang.Exception

Superclass:

java.lang.Throwable

Immediate Subclasses:

java.awt.AWTException,

java.awt.datatransfer.UnsupportedFlavorException,

java.io.IOException,

java.lang.ClassNotFoundException,

java.lang.CloneNotSupportedException,

java.lang.IllegalAccessException,

java.lang.InstantiationException,

java.lang.InterruptedException,

java.lang.NoSuchMethodException,

java.lang.RuntimeException,

java.lang.reflect.InvocationTargetException,

java.text.FormatException,

java.util.TooManyListenersException,

java.util.zip.DataFormatException

Interfaces Implemented:

None

Availability:

JDK 1.0 or later

The Exception class is the superclass of all of the standard exception classes that can be thrown in Java. The subclasses of Exception represent exceptional conditions a normal Java program may want to handle. Any explicitly thrown object in a Java program should be an instance of a subclass of Exception.

Many of the standard exceptions are also subclasses of RuntimeException. Run-time exceptions represent run-time conditions that can occur generally in any Java method, so a method is not required to declare that it throws any of the run-time exceptions. However, if a method can throw any of the other standard exceptions, it must declare them in its throws clause.

A Java program should try to handle all of the standard exception classes, since they represent routine abnormal conditions that should be anticipated and caught to prevent program termination.

Class Summary

public class java.lang.Exception extends java.lang.Throwable {
  // Constructors
  public Exception();
  public Exception(String s);
}

Description: This constructor creates an Exception with no associated detail message.

public Exception(String s)

Parameters

s: The detail message.

Description

This constructor creates an Exception with the specified message.

Inherited Methods

Method	Inherited From	Method	Inherited From
`clone()`	`Object`	`equals(Object)`	`Object`
`fillInStackTrace()`	`Throwable`	`finalize()`	`Object`
`getClass()`	`Object`	`getLocalizedMessage()`	`Throwable`
`getMessage()`	`Throwable`	`hashCode()`	`Object`
`notify()`	`Object`	`notifyAll()`	`Object`
`printStackTrace()`	`Throwable`	`printStackTrace(PrintStream)`	`Throwable`
`printStackTrace(PrintWriter)`	`Throwable`	`toString()`	`Object`
`wait()`	`Object`	`wait(long)`	`Object`
`wait(long, int)`	`Object`