public static final Snippet.Status VALID

The snippet is a valid snippet (in the context of current JShell state). Only snippets with VALID Status can be executed (though not all VALID snippets have executable code).

The snippet is defined (isDefined() == true). If the snippet is a declaration or import (Snippet.Kind.isPersistent()), it is visible to other snippets

The snippet will update as dependents change (isActive() == true), its status could become RECOVERABLE_DEFINED, RECOVERABLE_NOT_DEFINED, DROPPED, or OVERWRITTEN.

public static final Snippet.Status RECOVERABLE_DEFINED

The snippet is a declaration snippet with potentially recoverable unresolved references or other issues in its body (in the context of current JShell state). Only a DeclarationSnippet can have this Status.

The snippet has a valid signature and it is visible to other snippets (isDefined() == true) and thus can be referenced in existing or new snippets but the snippet cannot be executed. An UnresolvedReferenceException will be thrown on an attempt to execute it.

The snippet will update as dependents change (isActive() == true), its status could become VALID, RECOVERABLE_NOT_DEFINED, DROPPED, or OVERWRITTEN.

Note: both RECOVERABLE_DEFINED and RECOVERABLE_NOT_DEFINED indicate potentially recoverable errors, they differ in that, for RECOVERABLE_DEFINED, the snippet is defined.

public static final Snippet.Status RECOVERABLE_NOT_DEFINED

The snippet is a declaration snippet with potentially recoverable unresolved references or other issues (in the context of current JShell state). Only a DeclarationSnippet can have this Status.

The snippet has an invalid signature or the implementation is otherwise unable to define it. The snippet it is not visible to other snippets (isDefined() == false) and thus cannot be referenced or executed.

The snippet will update as dependents change (isActive() == true), its status could become VALID, RECOVERABLE_DEFINED, DROPPED, or OVERWRITTEN.

Note: both RECOVERABLE_DEFINED and RECOVERABLE_NOT_DEFINED indicate potentially recoverable errors, they differ in that, for RECOVERABLE_DEFINED, the snippet is defined.

public static final Snippet.Status DROPPED

The snippet is inactive because of an explicit call to the JShell.drop(Snippet).

The snippet is not visible to other snippets (isDefined() == false) and thus cannot be referenced or executed.

The snippet will not update as dependents change (isActive() == false), its Status will never change again.

public static final Snippet.Status OVERWRITTEN

The snippet is inactive because it has been replaced by a new snippet. This occurs when the new snippet added with eval matches a previous snippet. A TypeDeclSnippet will match another TypeDeclSnippet if the names match. For example class X { } will overwrite class X { int ii; } or interface X { }. A MethodSnippet will match another MethodSnippet if the names and parameter types match. For example void m(int a) { } will overwrite int m(int a) { return a+a; }. A VarSnippet will match another VarSnippet if the names match. For example double z; will overwrite long z = 2L;. Only a PersistentSnippet can have this Status.

The snippet is not visible to other snippets (isDefined() == false) and thus cannot be referenced or executed.

The snippet will not update as dependents change (isActive() == false), its Status will never change again.

public static final Snippet.Status REJECTED

The snippet is inactive because it failed compilation on initial evaluation and it is not capable of becoming valid with further changes to the JShell state.

The snippet is not visible to other snippets (isDefined() == false) and thus cannot be referenced or executed.

The snippet will not update as dependents change (isActive() == false), its Status will never change again.

public static final Snippet.Status NONEXISTENT

The snippet is inactive because it does not yet exist. Used only in SnippetEvent.previousStatus for new snippets. JShell.status(Snippet) will never return this Status.

Vacuously, isDefined() and isActive() are both defined false.

public static Snippet.Status[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

public static Snippet.Status valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

public boolean isActive()

Indicates whether the Snippet is active, that is, will a persistent snippet be re-evaluated when a new JShell.eval(String) or JShell.drop(Snippet) that could change its status is invoked. This is more broad than isDefined() since a Snippet which is RECOVERABLE_NOT_DEFINED will be updated.

public boolean isDefined()

Indicates whether the snippet is currently part of the defined state of the JShell. Is it visible to compilation of other snippets?