NullType

java.lang.Object
- org.apache.bcel.generic.Type
- - org.apache.bcel.generic.ReferenceType
  - - edu.umd.cs.findbugs.ba.type.NullType

All Implemented Interfaces:

ExtendedTypes
```
public class NullType
extends org.apache.bcel.generic.ReferenceType
implements ExtendedTypes
```
Special type representing the null value. This is a type which is higher in the lattice than any object type, but lower than the overall Top type. It represents the type of the null value, which may logically be merged with any object type without loss of information.

See Also:

TypeAnalysis, TypeFrame, TypeMerger

Field Summary

Fields
Modifier and Type Field Description

private static long serialVersionUID

private static NullType theInstance
- Fields inherited from class org.apache.bcel.generic.Type
  BOOLEAN, BYTE, CHAR, CLASS, DOUBLE, FLOAT, INT, LONG, NO_ARGS, NULL, OBJECT, SHORT, signature, STRING, STRINGBUFFER, THROWABLE, type, UNKNOWN, VOID
- Fields inherited from interface edu.umd.cs.findbugs.ba.type.ExtendedTypes
  T_AVAIL_TYPE, T_BOTTOM, T_DOUBLE_EXTRA, T_EXCEPTION, T_LONG_EXTRA, T_NULL, T_TOP

Constructor Summary

Constructors
Modifier Constructor Description

private NullType()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(java.lang.Object o)`
`int`	`hashCode()`
`static NullType`	`instance()`

Methods inherited from class org.apache.bcel.generic.ReferenceType
firstCommonSuperclass, getFirstCommonSuperclass, isAssignmentCompatibleWith, isCastableTo

Methods inherited from class org.apache.bcel.generic.Type
getArgumentTypes, getClassName, getMethodSignature, getReturnType, getSignature, getSignature, getSize, getType, getType, getType, getTypes, normalizeForStackOrLocal, toString

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

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
  - theInstance
```
private static final NullType theInstance
```
- Constructor Detail
  - NullType
```
private NullType()
```
- Method Detail
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class org.apache.bcel.generic.Type
  - equals
```
public boolean equals(java.lang.Object o)
```
    Overrides:
    
    equals in class org.apache.bcel.generic.Type
  - instance
```
public static NullType instance()
```