innerbuilder

IntelliJ IDEA plugin that adds a 'Builder' action to the Generate menu (Alt+Insert) which generates an inner builder class as described in the Effective Java book. Works with IntelliJ IDEA 2019 and later.

public class JavaBean {
    private final String foo;
    private String bar;
    private int qux;
    private Double x,y;

    private JavaBean(Builder builder) {
        foo = builder.foo;
        bar = builder.bar;
        qux = builder.qux;
        x = builder.x;
        y = builder.y;
    }

    public static Builder newJavaBean() {
        return new Builder();
    }

    public static final class Builder {
        private String foo;
        private String bar;
        private int qux;
        private Double x;
        private Double y;

        private Builder() {
        }

        public Builder foo(String val) {
            foo = val;
            return this;
        }

        public Builder bar(String val) {
            bar = val;
            return this;
        }

        public Builder qux(int val) {
            qux = val;
            return this;
        }

        public Builder x(Double val) {
            x = val;
            return this;
        }

        public Builder y(Double val) {
            y = val;
            return this;
        }

        public JavaBean build() {
            return new JavaBean(this);
        }
    }
}

Installation

In IntelliJ IDEA 2019 or later, open Preferences... > Plugins, search for innerbuilder. It should show up in the plugin list, click INSTALL.

Manual installation

Download the plugin jar innerbuilder.jar and select Install Plugin From Disk in IntelliJ's plugin preferences.

Usage

Use Shift+Alt+B or Alt+Insert and select Builder.... Choose the fields to be included and press OK. When generating a builder when a builder already exists, the plugin will try to update it. It will add missing fields and builder methods, but never remove any fields or methods.

Rate

If you enjoy this plugin, please rate it on its plugins.jetbrains.com page.

Building

Run ./prepare-build.sh to download IntelliJ IDEA Community Edition
Run mvn package

License

Licensed under the Apache License, Version 2.0.