plume

Class JWhich

java.lang.Object

plume.JWhich

public final class JWhich
extends java.lang.Object

JWhich is a utility that takes a Java class name and displays the absolute pathname of the class file that would be loaded first by the class loader, as prescribed by the class path.

JWhich also validates the class path and reports any non-existent or invalid class path entries.

Usage is similar to the UNIX which command.

Example uses:

To find the absolute pathname of MyClass.class not in a package:

java JWhich MyClass

To find the absolute pathname of MyClass.class in the my.package package:

java JWhich my.package.MyClass

Method Summary

Modifier and Type	Method and Description
protected static java.lang.String	asResourceName(java.lang.String resource)
static java.net.URL	findClass(java.lang.String className) Returns the URL of the resource denoted by the specified class name, as prescribed by the class path.
protected static java.lang.String	getClasspath() Return the classpath.
static void	main(java.lang.String[] args)
static void	printClasspath() Print the classpath to System.out.
static void	setClasspath(java.lang.String classpath) Set the classpath to the given string.
static void	validate() Validates the class path and reports any non-existent or invalid class path entries.
static void	which(java.lang.String className) Prints the absolute pathname of the class file containing the specified class name, as prescribed by the class path.

Methods inherited from class java.lang.Object

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

Method Detail

which

public static void which(java.lang.String className)

Prints the absolute pathname of the class file containing the specified class name, as prescribed by the class path.

Parameters:

className - name of the class

findClass

public static java.net.URL findClass(java.lang.String className)

Returns the URL of the resource denoted by the specified class name, as prescribed by the class path.

Parameters:

className - name of the class

Returns:

class URL, or null of the class was not found

asResourceName

protected static java.lang.String asResourceName(java.lang.String resource)

validate

public static void validate()

Validates the class path and reports any non-existent or invalid class path entries.

Valid class path entries include directories, .zip files, and .jar files.

printClasspath

public static void printClasspath()

Print the classpath to System.out.

setClasspath

public static void setClasspath(java.lang.String classpath)

Set the classpath to the given string.

Parameters:

classpath - the new classpath

getClasspath

protected static java.lang.String getClasspath()

Return the classpath.

Returns:

the classpath

main

public static void main(java.lang.String[] args)