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Java Debug Interface | ||||||||
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public interface Value
The mirror for a value in the target VM. This interface is the root of a value hierarchy encompassing primitive values and object values.
Some examples of where values may be accessed:
ObjectReference.getValue(Field)- value of a field StackFrame.getValue(LocalVariable)- value of a variable VirtualMachine.mirrorOf(double)- created in the target VM by the JDI client ModificationWatchpointEvent.valueToBe()- returned with an event
The following table illustrates which subinterfaces of Value are used to mirror values in the target VM --
Subinterfaces of PrimitiveValue |
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|---|---|---|---|
| Kind of value | For example - expression in target |
Is mirrored as an instance of |
Type of valueValue.type() |
| a boolean | true |
BooleanValue |
BooleanType |
| a byte | (byte)4 |
ByteValue |
ByteType |
| a char | 'a' |
CharValue |
CharType |
| a double | 3.1415926 |
DoubleValue |
DoubleType |
| a float | 2.5f |
FloatValue |
FloatType |
| an int | 22 |
IntegerValue |
IntegerType |
| a long | 1024L |
LongValue |
LongType |
| a short | (short)12 |
ShortValue |
ShortType |
| a void | |
VoidValue |
VoidType |
Subinterfaces of ObjectReference |
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| Kind of value | For example - expression in target |
Is mirrored as an instance of |
Type of valueValue.type() |
| a class instance | this |
ObjectReference |
ClassType |
| an array | new int[5] |
ArrayReference |
ArrayType |
| a string | "hello" |
StringReference |
ClassType |
| a thread | Thread.currentThread() |
ThreadReference |
ClassType |
| a thread group | Thread.currentThread() |
ThreadGroupReference |
ClassType |
a java.lang.Classinstance |
this.getClass() |
ClassObjectReference |
ClassType |
| a class loader | this.getClass() |
ClassLoaderReference |
ClassType |
| Other | |||
| Kind of value | For example - expression in target | Is mirrored as | Type of value
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| null | null |
null |
n/a |
| Method Summary | |
|---|---|
Type |
type()
Returns the run-time type of this value. |
| Methods inherited from interface com.sun.jdi.Mirror |
|---|
toString, virtualMachine |
| Method Detail |
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Type type()
Type which mirrors the value's type in the
target VM.Type
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