LocalVariable (Java Debug Interface )
Keywords: com.sun.jdi.LocalVariable interface
Date: 2023-01-18

com.sun.jdi

## Interface LocalVariable

- All Superinterfaces:
    Comparable<LocalVariable>, Mirror

      @Exported
      public interface LocalVariable
      extends Mirror, Comparable<LocalVariable>

  A local variable in the target VM. Each variable declared within a `Method` has its own LocalVariable object. Variables of the same name declared in different scopes have different LocalVariable objects. LocalVariables can be used alone to retrieve static information about their declaration, or can be used in conjunction with a `StackFrame` to set and get values.
  Since:
    1.3
  See Also:
    `StackFrame`, `Method`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `equals(Object obj)` Compares the specified Object with this LocalVariable for equality.
    `String` | `genericSignature()` Gets the generic signature for this variable if there is one.
    `int` | `hashCode()` Returns the hash code value for this LocalVariable.
    `boolean` | `isArgument()` Determines if this variable is an argument to its method.
    `boolean` | `isVisible(StackFrame frame)` Determines whether this variable can be accessed from the given `StackFrame`.
    `String` | `name()` Gets the name of the local variable.
    `String` | `signature()` Gets the JNI signature of the local variable.
    `Type` | `type()` Returns the type of this variable.
    `String` | `typeName()` Returns a text representation of the type of this variable.

    - ### Methods inherited from interface com.sun.jdi.Mirror

      `toString, virtualMachine`

    - ### Methods inherited from interface java.lang.Comparable

      `compareTo`

- - ### Method Detail

    - #### name

          String name()

      Gets the name of the local variable.
      Returns:
        a string containing the name.

    - #### typeName

          String typeName()

      Returns a text representation of the type of this variable. Where the type is the type specified in the declaration of this local variable.

      This type name is always available even if the type has not yet been created or loaded.

      Returns:
        a String representing the type of this local variable.

    - #### type

          Type type()
             throws ClassNotLoadedException

      Returns the type of this variable. Where the type is the type specified in the declaration of this local variable.

      Note: if the type of this variable is a reference type (class, interface, or array) and it has not been created or loaded by the class loader of the enclosing class, then ClassNotLoadedException will be thrown. Also, a reference type may have been loaded but not yet prepared, in which case the type will be returned but attempts to perform some operations on the returned type (e.g. `fields()`) will throw a `ClassNotPreparedException`. Use `ReferenceType.isPrepared()` to determine if a reference type is prepared.

      Returns:
        the `Type` of this local variable.
      Throws:
        `ClassNotLoadedException` - if the type has not yet been loaded through the appropriate class loader.
      See Also:
        `Type`, `Field.type() - for usage examples`

    - #### signature

          String signature()

      Gets the JNI signature of the local variable.
      Returns:
        a string containing the signature.
      See Also:
        Type Signatures

    - #### genericSignature

          String genericSignature()

      Gets the generic signature for this variable if there is one. Generic signatures are described in the The Java™ Virtual Machine Specification.
      Returns:
        a string containing the generic signature, or `null` if there is no generic signature.
      Since:
        1.5

    - #### isVisible

          boolean isVisible(StackFrame frame)

      Determines whether this variable can be accessed from the given `StackFrame`. See `StackFrame.visibleVariables()` for a complete description variable visibility in this interface.
      Parameters:
        `frame` - the StackFrame querying visibility
      Returns:
        `true` if this variable is visible; `false` otherwise.
      Throws:
        `IllegalArgumentException` - if the stack frame's method does not match this variable's method.

    - #### isArgument

          boolean isArgument()

      Determines if this variable is an argument to its method.
      Returns:
        `true` if this variable is an argument; `false` otherwise.

    - #### equals

          boolean equals(Object obj)

      Compares the specified Object with this LocalVariable for equality.
      Overrides:
        `equals` in class `Object`
      Parameters:
        `obj` - the reference object with which to compare.
      Returns:
        true if the Object is a LocalVariable, if both LocalVariables are contained in the same method (as determined by `Method.equals(java.lang.Object)`), and if both LocalVariables mirror the same declaration within that method
      See Also:
        `Object.hashCode()`, `HashMap`

    - #### hashCode

          int hashCode()

      Returns the hash code value for this LocalVariable.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        the integer hash code
      See Also:
        `Object.equals(java.lang.Object)`, `System.identityHashCode(java.lang.Object)`

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