Package java.lang

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Class NullPointerException

public  class  java.lang.NullPointerException
    extends  java.lang.RuntimeException  
{
        // Constructors
    public NullPointerException();	
    public NullPointerException(String  s);	
}

Thrown when an application attempts to use null in a case where an object is required. These include:

• Call the instance method of a null object.
• Accessing or modifying the field of the null object.
• Taking the length of null as if it were an array.
• Accessing or modifying the slots of null as if it were an array.
• Throwing null as if it were a Throwable value.

Applications should throw instances of this class to indicate other illegal uses of the null object.

Constructors

NullPointerException

public NullPointerException() 

Constructs a NullPointerException with no detail message.

NullPointerException

public NullPointerException(String  s) 

Constructs a NullPointerException with the specified detail message.

Parameter	Description
s	the detail message