IFNULL

java.lang.Object
- org.apache.bcel.generic.Instruction
- - org.apache.bcel.generic.BranchInstruction
  - - org.apache.bcel.generic.IfInstruction
    - - org.apache.bcel.generic.IFNULL

All Implemented Interfaces:

java.lang.Cloneable, InstructionTargeter, StackConsumer
```
public class IFNULL
extends IfInstruction
```
IFNULL - Branch if reference is not null
```
 Stack: ..., reference -> ...
 
```

Field Summary
- Fields inherited from class org.apache.bcel.generic.BranchInstruction
  index, position, target
- Fields inherited from class org.apache.bcel.generic.Instruction
  EMPTY_ARRAY, length, opcode

Constructor Summary

Constructors
Constructor Description

IFNULL()
Empty constructor needed for Instruction.readInstruction.

IFNULL(InstructionHandle target)
Constructs an IFNULL instruction.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`accept(Visitor v)`	Call corresponding visitor method(s).
`IfInstruction`	`negate()`	Gets the negation of this instruction.

Methods inherited from class org.apache.bcel.generic.BranchInstruction
containsTarget, dispose, dump, getIndex, getPosition, getTarget, getTargetOffset, getTargetOffset, initFromFile, notifyTarget, setIndex, setPosition, setTarget, toString, updatePosition, updateTarget

Methods inherited from class org.apache.bcel.generic.Instruction
consumeStack, copy, equals, getComparator, getLength, getName, getOpcode, hashCode, isValidByte, isValidShort, produceStack, readInstruction, setComparator, setLength, setOpcode, toString, toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.bcel.generic.StackConsumer
consumeStack

- Constructor Detail
  - IFNULL
```
IFNULL()
```
    Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
  - IFNULL
```
public IFNULL(InstructionHandle target)
```
    Constructs an IFNULL instruction.
    
    Parameters:
    
    target - the target instruction.
- Method Detail
  - accept
```
public void accept(Visitor v)
```
    Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
    
    Specified by:
    
    accept in class Instruction
    
    Parameters:
    
    v - Visitor object.
  - negate
```
public IfInstruction negate()
```
    Description copied from class: IfInstruction
    
    Gets the negation of this instruction.
    
    Specified by:
    
    negate in class IfInstruction
    
    Returns:
    
    negation of instruction.