import java.util.List; public class SuperBuilderWithDefaults { public static class Parent { private long millis = System.currentTimeMillis(); private N numberField = null; @java.lang.SuppressWarnings("all") public static abstract class ParentBuilder, B extends ParentBuilder> { @java.lang.SuppressWarnings("all") private boolean millis$set; @java.lang.SuppressWarnings("all") private long millis; @java.lang.SuppressWarnings("all") private boolean numberField$set; @java.lang.SuppressWarnings("all") private N numberField; @java.lang.SuppressWarnings("all") protected abstract B self(); @java.lang.SuppressWarnings("all") public abstract C build(); @java.lang.SuppressWarnings("all") public B millis(final long millis) { this.millis = millis; millis$set = true; return self(); } @java.lang.SuppressWarnings("all") public B numberField(final N numberField) { this.numberField = numberField; numberField$set = true; return self(); } @java.lang.Override @java.lang.SuppressWarnings("all") public java.lang.String toString() { return "SuperBuilderWithDefaults.Parent.ParentBuilder(millis=" + this.millis + ", numberField=" + this.numberField + ")"; } } @java.lang.SuppressWarnings("all") private static final class ParentBuilderImpl extends ParentBuilder, ParentBuilderImpl> { @java.lang.SuppressWarnings("all") private ParentBuilderImpl() { } @java.lang.Override @java.lang.SuppressWarnings("all") protected ParentBuilderImpl self() { return this; } @java.lang.Override @java.lang.SuppressWarnings("all") public Parent build() { return new Parent(this); } } @java.lang.SuppressWarnings("all") protected Parent(final ParentBuilder b) { if (b.millis$set) this.millis = b.millis; if (b.numberField$set) this.numberField = b.numberField; } @java.lang.SuppressWarnings("all") public static ParentBuilder builder() { return new ParentBuilderImpl(); } } public static class Child extends Parent { private double doubleField = Math.PI; @java.lang.SuppressWarnings("all") public static abstract class ChildBuilder> extends Parent.ParentBuilder { @java.lang.SuppressWarnings("all") private boolean doubleField$set; @java.lang.SuppressWarnings("all") private double doubleField; @java.lang.Override @java.lang.SuppressWarnings("all") protected abstract B self(); @java.lang.Override @java.lang.SuppressWarnings("all") public abstract C build(); @java.lang.SuppressWarnings("all") public B doubleField(final double doubleField) { this.doubleField = doubleField; doubleField$set = true; return self(); } @java.lang.Override @java.lang.SuppressWarnings("all") public java.lang.String toString() { return "SuperBuilderWithDefaults.Child.ChildBuilder(super=" + super.toString() + ", doubleField=" + this.doubleField + ")"; } } @java.lang.SuppressWarnings("all") private static final class ChildBuilderImpl extends ChildBuilder { @java.lang.SuppressWarnings("all") private ChildBuilderImpl() { } @java.lang.Override @java.lang.SuppressWarnings("all") protected ChildBuilderImpl self() { return this; } @java.lang.Override @java.lang.SuppressWarnings("all") public Child build() { return new Child(this); } } @java.lang.SuppressWarnings("all") protected Child(final ChildBuilder b) { super(b); if (b.doubleField$set) this.doubleField = b.doubleField; } @java.lang.SuppressWarnings("all") public static ChildBuilder builder() { return new ChildBuilderImpl(); } } public static void test() { Child x = Child.builder().doubleField(0.1).numberField(5).millis(1234567890L).build(); } }