Quick Fix

Quick Fix

The Java editor offers corrections to problems found while typing and after compiling. To show that correction proposals are available for a problem or warning, a 'light bulb' is visible on the editor's annotation bar.
Left click on the light bulb or invoking Ctrl+1 (Edit / Quick Fix) brings up the proposals for the problem at the cursor position.

The following quick fixes are available:

Package Declaration

Add missing package declaration or correct package declaration
Move compilation unit to package that corresponds to the package declaration

Imports

Remove unused, unresolvable or non-visible import
Invoke 'Organize import' on problems in imports

Types

Create new class or interface for references to types that can not be resolved
Change visibility for types that are accessed but not visible
Rename to a similar type for references to types that can not be resolved
Add import statement for types that can not be resolved but exist in the project
Add explicit import statement for ambiguous type references (two import-on-demands for the same type)
If the type name is not matching with the compilation unit name either rename the type or rename the compilation unit
Remove unused private types

Constructors

Create new constructor for references to constructors that can not be resolved (this, super or new class creation)
Reorder or remove arguments for constructor references that mismatch parameters
Change method with constructor name to constructor (remove return type)
Change visibility for constructors that are accessed but not visible
Remove unused private constructor
Create constructor when super call of the implicit default constructor is undefined, not visible or throws an exception
If type contains unimplemented methods, change type modifier to 'abstract' or add the method to implement

Methods

Create new method for references to methods that can not be resolved
Rename to a similar method for references to methods that can not be resolved
Reorder or remove arguments for method references that mismatch parameters
Correct access (visibility, static) of referenced methods
Remove unused private methods
Correct return type for methods that have a missing return type or where the return type does not match the return statement
Add return statement if missing
For non-abstract methods with no body change to 'abstract' or add body
For an abstract method in a non-abstract type remove abstract modifier of the method or make type abstract
For an abstract/native method with body remove the abstract or native modifier or remove body
Change method access to 'static' if method is invoked inside a constructor invocation (super, this)
Change method access to default access to avoid emulated method access

Fields and variables

Correct access (visibility, static) of referenced fields
Create new fields, parameters or local variables for references to variables that can not be resolved
Rename to a variable with similar name for references that can not be resolved
Remove unused private fields
Correct non-static access of static fields
Add 'final' modifier to local variables accessed in outer types
Change field access to default access to avoid emulated method access
Change local variable type to fix a type mismatch
Initialize a variable that has not been initialized

Exception Handling

Remove unneeded catch block
Handle uncaught exception by surrounding with try/catch or adding catch block to a surrounding try block
Handle uncaught exception by adding a throw declaration to the parent method or by generalize an existing throw declaration

Others

Add cast or change cast to fix type mismatches
For non-NLS strings open the NLS wizard or mark as non-NLS

Quick Assist are proposals available even if there is no problem or warning: There is no light bulb shown so the user has to know the available assists.

Quick Assists

Replace catch clause with throws declaration on the parent method
Transform an expression statement to an assignment to a new local or new field
Remove surrounding 'if', 'for', 'while', 'do' statement
Remove surrounding try block with a single catch or finally block
Remove surrounding anonymous class, block or parenthesis
Local rename of a type, method or variable in a linked 'template' mode
Surround selected lines with templates (''if', 'while'..)

Java editor

JDT actions

Package Declaration	Add missing package declaration or correct package declaration Move compilation unit to package that corresponds to the package declaration
Imports	Remove unused, unresolvable or non-visible import Invoke 'Organize import' on problems in imports
Types	Create new class or interface for references to types that can not be resolved Change visibility for types that are accessed but not visible Rename to a similar type for references to types that can not be resolved Add import statement for types that can not be resolved but exist in the project Add explicit import statement for ambiguous type references (two import-on-demands for the same type) If the type name is not matching with the compilation unit name either rename the type or rename the compilation unit Remove unused private types
Constructors	Create new constructor for references to constructors that can not be resolved (this, super or new class creation) Reorder or remove arguments for constructor references that mismatch parameters Change method with constructor name to constructor (remove return type) Change visibility for constructors that are accessed but not visible Remove unused private constructor Create constructor when super call of the implicit default constructor is undefined, not visible or throws an exception If type contains unimplemented methods, change type modifier to 'abstract' or add the method to implement
Methods	Create new method for references to methods that can not be resolved Rename to a similar method for references to methods that can not be resolved Reorder or remove arguments for method references that mismatch parameters Correct access (visibility, static) of referenced methods Remove unused private methods Correct return type for methods that have a missing return type or where the return type does not match the return statement Add return statement if missing For non-abstract methods with no body change to 'abstract' or add body For an abstract method in a non-abstract type remove abstract modifier of the method or make type abstract For an abstract/native method with body remove the abstract or native modifier or remove body Change method access to 'static' if method is invoked inside a constructor invocation (super, this) Change method access to default access to avoid emulated method access
Fields and variables	Correct access (visibility, static) of referenced fields Create new fields, parameters or local variables for references to variables that can not be resolved Rename to a variable with similar name for references that can not be resolved Remove unused private fields Correct non-static access of static fields Add 'final' modifier to local variables accessed in outer types Change field access to default access to avoid emulated method access Change local variable type to fix a type mismatch Initialize a variable that has not been initialized
Exception Handling	Remove unneeded catch block Handle uncaught exception by surrounding with try/catch or adding catch block to a surrounding try block Handle uncaught exception by adding a throw declaration to the parent method or by generalize an existing throw declaration
Others	Add cast or change cast to fix type mismatches For non-NLS strings open the NLS wizard or mark as non-NLS