Class getResourceAsStream() method in Java with Examples

The getResourceAsStream() method of java.lang.Class class is used to get the resource with the specified resource of this class. The method returns the specified resource of this class in the form of InputStream object.

Syntax:

public InputStream getResourceAsStream(String resourceName)

Parameter: This method accepts a parameter resourceName which is the resource to get.

Return Value: This method returns the specified resource of this class in the form of InputStream objects.

Exception This method throws:



  • NullPointerException if name is null

Below programs demonstrate the getResourceAsStream() method.

Example 1:

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// Java program to demonstrate
// getResourceAsStream() method
  
import java.util.*;
  
public class Test {
  
    public Object obj;
  
    public static void main(String[] args)
        throws ClassNotFoundException
    {
  
        // returns the Class object for this class
        Class myClass = Class.forName("Test");
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString());
  
        String resourceName = "obj";
  
        // Get the resource of myClass
        // using getResourceAsStream() method
        System.out.println(
            resourceName + " resource of myClass: "
            + myClass.getResourceAsStream(resourceName));
    }
}

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Output:

Class represented by myClass: class Test
obj resource of myClass: null

Example 2:

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// Java program to demonstrate
// getResourceAsStream() method
  
import java.util.*;
  
class Main {
  
    private Object obj;
  
    public static void main(String[] args)
        throws ClassNotFoundException, NoSuchFieldException
    {
  
        // returns the Class object for this class
        Class myClass = Class.forName("Main");
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString());
  
        String resourceName = "obj";
  
        try {
            // Get the resource of myClass
            // using getResourceAsStream() method
            System.out.println(
                resourceName + " resource of myClass: "
                + myClass.getResourceAsStream(resourceName));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

Class represented by myClass: class Main
obj resource of myClass: null

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getResourceAsStream-java.lang.String-

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