import java.util.List; public class SuperBuilderWithGenerics { public static class Parent<A> { A field1; List<String> items; @java.lang.SuppressWarnings("all") public static abstract class ParentBuilder<A, C extends SuperBuilderWithGenerics.Parent<A>, B extends SuperBuilderWithGenerics.Parent.ParentBuilder<A, C, B>> { @java.lang.SuppressWarnings("all") private A field1; @java.lang.SuppressWarnings("all") private java.util.ArrayList<String> items; @java.lang.SuppressWarnings("all") protected abstract B self(); @java.lang.SuppressWarnings("all") public abstract C build(); /** * @return {@code this}. */ @java.lang.SuppressWarnings("all") public B field1(final A field1) { this.field1 = field1; return self(); } @java.lang.SuppressWarnings("all") public B item(final String item) { if (this.items == null) this.items = new java.util.ArrayList<String>(); this.items.add(item); return self(); } @java.lang.SuppressWarnings("all") public B items(final java.util.Collection<? extends String> items) { if (items == null) { throw new java.lang.NullPointerException("items cannot be null"); } if (this.items == null) this.items = new java.util.ArrayList<String>(); this.items.addAll(items); return self(); } @java.lang.SuppressWarnings("all") public B clearItems() { if (this.items != null) this.items.clear(); return self(); } @java.lang.Override @java.lang.SuppressWarnings("all") public java.lang.String toString() { return "SuperBuilderWithGenerics.Parent.ParentBuilder(field1=" + this.field1 + ", items=" + this.items + ")"; } } @java.lang.SuppressWarnings("all") private static final class ParentBuilderImpl<A> extends SuperBuilderWithGenerics.Parent.ParentBuilder<A, SuperBuilderWithGenerics.Parent<A>, SuperBuilderWithGenerics.Parent.ParentBuilderImpl<A>> { @java.lang.SuppressWarnings("all") private ParentBuilderImpl() { } @java.lang.Override @java.lang.SuppressWarnings("all") protected SuperBuilderWithGenerics.Parent.ParentBuilderImpl<A> self() { return this; } @java.lang.Override @java.lang.SuppressWarnings("all") public SuperBuilderWithGenerics.Parent<A> build() { return new SuperBuilderWithGenerics.Parent<A>(this); } } @java.lang.SuppressWarnings("all") protected Parent(final SuperBuilderWithGenerics.Parent.ParentBuilder<A, ?, ?> b) { this.field1 = b.field1; java.util.List<String> items; switch (b.items == null ? 0 : b.items.size()) { case 0: items = java.util.Collections.emptyList(); break; case 1: items = java.util.Collections.singletonList(b.items.get(0)); break; default: items = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(b.items)); } this.items = items; } @java.lang.SuppressWarnings("all") public static <A> SuperBuilderWithGenerics.Parent.ParentBuilder<A, ?, ?> builder() { return new SuperBuilderWithGenerics.Parent.ParentBuilderImpl<A>(); } } public static class Child<A> extends Parent<A> { double field3; @java.lang.SuppressWarnings("all") public static abstract class ChildBuilder<A, C extends SuperBuilderWithGenerics.Child<A>, B extends SuperBuilderWithGenerics.Child.ChildBuilder<A, C, B>> extends Parent.ParentBuilder<A, C, B> { @java.lang.SuppressWarnings("all") private double field3; @java.lang.Override @java.lang.SuppressWarnings("all") protected abstract B self(); @java.lang.Override @java.lang.SuppressWarnings("all") public abstract C build(); /** * @return {@code this}. */ @java.lang.SuppressWarnings("all") public B field3(final double field3) { this.field3 = field3; return self(); } @java.lang.Override @java.lang.SuppressWarnings("all") public java.lang.String toString() { return "SuperBuilderWithGenerics.Child.ChildBuilder(super=" + super.toString() + ", field3=" + this.field3 + ")"; } } @java.lang.SuppressWarnings("all") private static final class ChildBuilderImpl<A> extends SuperBuilderWithGenerics.Child.ChildBuilder<A, SuperBuilderWithGenerics.Child<A>, SuperBuilderWithGenerics.Child.ChildBuilderImpl<A>> { @java.lang.SuppressWarnings("all") private ChildBuilderImpl() { } @java.lang.Override @java.lang.SuppressWarnings("all") protected SuperBuilderWithGenerics.Child.ChildBuilderImpl<A> self() { return this; } @java.lang.Override @java.lang.SuppressWarnings("all") public SuperBuilderWithGenerics.Child<A> build() { return new SuperBuilderWithGenerics.Child<A>(this); } } @java.lang.SuppressWarnings("all") protected Child(final SuperBuilderWithGenerics.Child.ChildBuilder<A, ?, ?> b) { super(b); this.field3 = b.field3; } @java.lang.SuppressWarnings("all") public static <A> SuperBuilderWithGenerics.Child.ChildBuilder<A, ?, ?> builder() { return new SuperBuilderWithGenerics.Child.ChildBuilderImpl<A>(); } } public static void test() { Child<Integer> x = Child.<Integer>builder().field3(0.0).field1(5).item("").build(); } }