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- Java.lang Package classes
- Java.lang - Home
- Java.lang - Boolean
- Java.lang - Byte
- Java.lang - Character
- Java.lang - Character.Subset
- Java.lang - Character.UnicodeBlock
- Java.lang - Class
- Java.lang - ClassLoader
- Java.lang - Compiler
- Java.lang - Double
- Java.lang - Enum
- Java.lang - Float
- Java.lang - InheritableThreadLocal
- Java.lang - Integer
- Java.lang - Long
- Java.lang - Math
- Java.lang - Number
- Java.lang - Object
- Java.lang - Package
- Java.lang - Process
- Java.lang - ProcessBuilder
- Java.lang - Runtime
- Java.lang - RuntimePermission
- Java.lang - SecurityManager
- Java.lang - Short
- Java.lang - StackTraceElement
- Java.lang - StrictMath
- Java.lang - String
- Java.lang - StringBuffer
- Java.lang - StringBuilder
- Java.lang - System
- Java.lang - Thread
- Java.lang - ThreadGroup
- Java.lang - ThreadLocal
- Java.lang - Throwable
- Java.lang - Void
- Java.lang Package extras
- Java.lang - Interfaces
- Java.lang - Errors
- Java.lang - Exceptions
- Java.lang Package Useful Resources
- Java.lang - Useful Resources
- Java.lang - Discussion
Java ClassLoader getSystemResource() Method
Description
The Java ClassLoader getSystemResource() method find a resource of the specified name from the search path used to load classes.
Declaration
Following is the declaration for java.lang.ClassLoader.getSystemResource() method
public static URL getSystemResource(String name)
Parameters
name − This is the resource name.
Return Value
This method returns a URL object for reading the resource, or null if the resource could not be found.
Exception
NA
Getting Resource from a Class Path Example
The following example shows the usage of java.lang.ClassLoader.getSystemResource() method. In this program, we've retrieved class of a ClassLoaderDemo. Then using getClassLoader(), we get the required ClassLoader and printed class loader class using getClass(). Now considering file.txt being in classpath of the java program, we've retrieved URL of the file using getSystemResource() method and printed the same.
package com.tutorialspoint; import java.net.URL; public class ClassLoaderDemo { public static void main(String[] args) throws Exception { Class cls = Class.forName("com.tutorialspoint.ClassLoaderDemo"); // returns the ClassLoader object associated with this Class ClassLoader cLoader = cls.getClassLoader(); System.out.println(cLoader.getClass()); // finds resource URL url = cLoader.getSystemResource("file.txt"); System.out.println("Value = " + url); } }
Output
Let us compile and run the above program, this will produce the following result −
class jdk.internal.loader.ClassLoaders$AppClassLoader Value = file:/C:/Users/Tutorialspoint/eclipse-workspace/Tutorialspoint/lib/file.txt
Checking Resource from a Class Path Example
The following example shows the usage of java.lang.ClassLoader.getSystemResource() method. In this program, we've retrieved class of a ClassLoaderDemo. Then using getClassLoader(), we get the required ClassLoader and printed class loader class using getClass(). Now considering a.txt not being in the class path, we've retrieved URL of the file using getSystemResource() method as null and printed the same.
package com.tutorialspoint; import java.net.URL; public class ClassLoaderDemo { public static void main(String[] args) throws Exception { Class cls = Class.forName("com.tutorialspoint.ClassLoaderDemo"); // returns the ClassLoader object associated with this Class ClassLoader cLoader = cls.getClassLoader(); System.out.println(cLoader.getClass()); // finds resource URL url = cLoader.getSystemResource("newfolder/a.txt"); System.out.println("Value = " + url); } }
Output
Let us compile and run the above program, this will produce the following result −
class jdk.internal.loader.ClassLoaders$AppClassLoader Value = null