Coding assistance in Java

Last modified: 27 February 2025

In Smart Mode, JetBrains Fleet provides coding assistance features for your Java projects. They help you avoid mistakes and write code in an efficient manner.

Code completion

As you type, JetBrains Fleet suggests completion options. The suggestions are based on a number of factors, such as the available code intelligence services, project model, surrounding code, and the visibility of symbols.

Code completion popup

Completion suggestions will appear automatically as you type, but you can also invoke them explicitly by pressing .

tip

You can use CamelHumps in code completion, that is you can type the initial letters of compound name parts and the name will appear in the list of suggestions. For example, you can type tes and then pick TextEncoderSettings from the completion list.

When you use code completion over existing code items, you can either insert the selected completion suggestion before the existing item by pressing Enter or replace the existing identifier with the selected suggestion by pressing Tab.

Postfix code completion

With postfix templates, you can transform an already-typed expression to a different one based on a postfix after the dot, the type of the expression, and its context. JetBrains Fleet includes a set of predefined postfix completion templates that you can use for other programming languages as well. You can copy, enable, and disable these templates.

Transform a statement with a postfix

  1. Type an expression and then type a postfix after a dot. For example, type .if.

  2. Press Tab.

    public class Foo {
    void m(boolean b) {
        b.if
    }
}

    The initial expression gets wrapped with an if statement.

    public class Foo {
    void m(boolean b) {
        if (b) {

        }
    }
}

Code actions

JetBrains Fleet constantly analyzes your code and suggests actions that you might want to perform in the current context. The suggested actions range from correcting errors to refactoring the code at the caret.

A popup with code actions

To see, which actions are available at the caret, press . After you have selected the required action, you can apply it right away or preview the result with .

Code actions preview

Apply a primary quick-fix

  1. Open the Problems popup, which is in the upper-right corner of the window.

  2. Click the issue that you want to fix from the list of problems.

  3. While the issue is selected, press . Alternatively, you can click the link with the suggested quick-fix.

apply_main_quick_fix

Type info

Whenever you are not sure what type you are currently working with, you can look it up by pressing . JetBrains Fleet will display the static type information for the symbol or expression at the caret.

A popup with type information

Parameter info

If you are using a method that has numerous overloads, or just want to look up the required parameters, use .

A popup with parameter information

Live templates

Use live templates to insert common constructs into your code, such as loops, conditions, declarations, or print statements.

For all live templates, refer to the list of live templates.

Code generation

Use code completion to override superclass members , generate accessor methods, equals(), hashcode(), and so on.

Generating a getter for the number field by typing gn and using the code completion suggestion

For example, if you want to generate a getter for a field called number, type gn and pick getNumber() from the suggestions.