import java.util.List; public class SuperBuilderBasic { public static class Parent { int field1; List<String> items; @java.lang.SuppressWarnings("all") public static abstract class ParentBuilder<C extends SuperBuilderBasic.Parent, B extends SuperBuilderBasic.Parent.ParentBuilder<C, B>> { @java.lang.SuppressWarnings("all") private int 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 int 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 "SuperBuilderBasic.Parent.ParentBuilder(field1=" + this.field1 + ", items=" + this.items + ")"; } } @java.lang.SuppressWarnings("all") private static final class ParentBuilderImpl extends SuperBuilderBasic.Parent.ParentBuilder<SuperBuilderBasic.Parent, SuperBuilderBasic.Parent.ParentBuilderImpl> { @java.lang.SuppressWarnings("all") private ParentBuilderImpl() { } @java.lang.Override @java.lang.SuppressWarnings("all") protected SuperBuilderBasic.Parent.ParentBuilderImpl self() { return this; } @java.lang.Override @java.lang.SuppressWarnings("all") public SuperBuilderBasic.Parent build() { return new SuperBuilderBasic.Parent(this); } } @java.lang.SuppressWarnings("all") protected Parent(final SuperBuilderBasic.Parent.ParentBuilder<?, ?> 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 SuperBuilderBasic.Parent.ParentBuilder<?, ?> builder() { return new SuperBuilderBasic.Parent.ParentBuilderImpl(); } } public static class Child extends SuperBuilderBasic.Parent { double field3; @java.lang.SuppressWarnings("all") public static abstract class ChildBuilder<C extends SuperBuilderBasic.Child, B extends SuperBuilderBasic.Child.ChildBuilder<C, B>> extends SuperBuilderBasic.Parent.ParentBuilder<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 "SuperBuilderBasic.Child.ChildBuilder(super=" + super.toString() + ", field3=" + this.field3 + ")"; } } @java.lang.SuppressWarnings("all") private static final class ChildBuilderImpl extends SuperBuilderBasic.Child.ChildBuilder<SuperBuilderBasic.Child, SuperBuilderBasic.Child.ChildBuilderImpl> { @java.lang.SuppressWarnings("all") private ChildBuilderImpl() { } @java.lang.Override @java.lang.SuppressWarnings("all") protected SuperBuilderBasic.Child.ChildBuilderImpl self() { return this; } @java.lang.Override @java.lang.SuppressWarnings("all") public SuperBuilderBasic.Child build() { return new SuperBuilderBasic.Child(this); } } @java.lang.SuppressWarnings("all") protected Child(final SuperBuilderBasic.Child.ChildBuilder<?, ?> b) { super(b); this.field3 = b.field3; } @java.lang.SuppressWarnings("all") public static SuperBuilderBasic.Child.ChildBuilder<?, ?> builder() { return new SuperBuilderBasic.Child.ChildBuilderImpl(); } } public static void test() { Child x = Child.builder().field3(0.0).field1(5).item("").build(); } }