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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class ClassNotFoundException - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.lang
Class ClassNotFoundException

java.lang.Object
  |
  +--java.lang.Throwable
        |
        +--java.lang.Exception
              |
              +--java.lang.ClassNotFoundException

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public class ClassNotFoundException

extends Exception

Thrown when an application tries to load in a class through its string name using:

• The forName method in class Class.
• The findSystemClass method in class ClassLoader .
• The loadClass method in class ClassLoader.

but no definition for the class with the specifed name could be found.

Since:

JDK1.0

See Also:

Class.forName(java.lang.String), ClassLoader.findSystemClass(java.lang.String), ClassLoader.loadClass(java.lang.String, boolean), Serialized Form

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Constructor Summary

ClassNotFoundException()           Constructs a ClassNotFoundException with no detail message.

ClassNotFoundException(String s)           Constructs a ClassNotFoundException with the specified detail message.

ClassNotFoundException(String s, Throwable ex)           Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

 

Method Summary
Throwable	getException()           Returns the exception that was raised if an error occurred while attempting to load the class.
void	printStackTrace()           Prints the stack backtrace.
void	printStackTrace(PrintStream ps)           Prints the stack backtrace to the specified print stream.
void	printStackTrace(PrintWriter pw)           Prints the stack backtrace to the specified print writer.

 

Methods inherited from class java.lang.Throwable

fillInStackTrace, getLocalizedMessage, getMessage, toString

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

ClassNotFoundException

public ClassNotFoundException()

Constructs a ClassNotFoundException with no detail message.

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ClassNotFoundException

public ClassNotFoundException(String s)

Constructs a ClassNotFoundException with the specified detail message.

Parameters:

s - the detail message.

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ClassNotFoundException

public ClassNotFoundException(String s,
                              Throwable ex)

Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

Parameters:

s - the detail message

ex - the exception that was raised while loading the class

Since:

JDK1.2

Method Detail

getException

public Throwable getException()

Returns the exception that was raised if an error occurred while attempting to load the class. Otherwise, returns null.

Since:

JDK1.2

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printStackTrace

public void printStackTrace()

Prints the stack backtrace. If an exception occurred during class loading it prints that exception's stack trace, or else prints the stack backtrace of this exception.

Overrides:

printStackTrace in class Throwable

See Also:

System.err

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printStackTrace

public void printStackTrace(PrintStream ps)

Prints the stack backtrace to the specified print stream. If an exception occurred during class loading it prints that exception's stack trace, or else prints the stack backtrace of this exception.

Overrides:

printStackTrace in class Throwable

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printStackTrace

public void printStackTrace(PrintWriter pw)

Prints the stack backtrace to the specified print writer. If an exception occurred during class loading it prints that exception's stack trace, or else prints the stack backtrace of this exception.

Overrides:

printStackTrace in class Throwable

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