Interface Value
- All Superinterfaces:
Mirror
- All Known Subinterfaces:
-
ArrayReference,BooleanValue,ByteValue,CharValue,ClassLoaderReference,ClassObjectReference,DoubleValue,FloatValue,IntegerValue,LongValue,ModuleReference,ObjectReference,PrimitiveValue,ShortValue,StringReference,ThreadGroupReference,ThreadReference,VoidValue
public interface Value extends Mirror
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 tables illustrate which subinterfaces of Value are used to mirror values in the target VM --
| 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 |
| 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().getThreadGroup()
| ThreadGroupReference | ClassType |
a java.lang.Classinstance | this.getClass() | ClassObjectReference | ClassType |
| a class loader |
this.getClass().getClassLoader()
| ClassLoaderReference | ClassType |
| Kind of value | For example - expression in target | Is mirrored as |
Type of value |
|---|---|---|---|
| null | null | null | n/a |
- Since:
- 1.3
Methods
| Modifier and Type | Method | Description |
|---|---|---|
Type | type() | Returns the run-time type of this value. |
Methods declared in interface com.sun.jdi.Mirror
toString, virtualMachine
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/11/docs/api/jdk.jdi/com/sun/jdi/Value.html