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  1. Write and edit source code
  2. Code refactoring
  3. Refactorings as intention actions
  4. Replace constructor with builder

Replace constructor with builder

Last modified: 29 November 2022

note

This refactoring is available only as an intention action.

The Replace Constructor with Builder refactoring helps hide a constructor, replacing its usages with the references to a newly generated builder class, or to an existing builder class.

Example

Before

class Foo {
    Foo(String firstName, String lastName, int age, boolean married) {}
    public static void main(String[] args) {
        Foo joe = new Foo("Joe", "Smith", 42, false);
    }
}

After

class Foo {
    Foo(String firstName, String lastName, int age, boolean married) {
    }
    public static void main(String[] args) {
        //married is omitted, default "false" is used
        Foo joe = new FooBuilder()
        .setFirstName("Joe")
        .setLastName("Smith")
        .setAge(42)
        .createFoo();
    }
    static class FooBuilder {
        private String firstName;
        private String firstName;
        private int age;
        private boolean married;
        public FooBuilder setFirstName(String firstName) {
            this.firstName = firstName;
            return this;
        }
        public Foo createFoo() {
            return new Foo(firstName, lastName, age, married);
        }
    }
}

See also

Reference