分步构建【其他模式】

分步构建模式

public class StepBuilder {
    /**
     * Step Builder Pattern【分步构建模式】：
     * 明确指定具体的构建步骤执行什么操作
     */
    @Test
    public void all() {
        final Long id = Long.valueOf(1);
        final User user = User.stepBuilder()
                .id(id)
                .name("zxd")
                .hoppy("sleep")
                .hoppy("eat")
                .hoppy("work")
                .build();
        assertEquals(id,user.getId());
    }
}
@Getter
class User{
    private final Long id;
    private final String name;
    private final List<String> hoppies;

    @SuppressWarnings("synthetic-access")
    public static IdBuiler stepBuilder() {
        return new UserStepBuilder();
    }

    private User(Long id, String name, List<String> hoppies) {
        this.id = id;
        this.name = name;
        this.hoppies = hoppies;
    }

    public interface IdBuiler {
        NameBuilder id(Long id);
    }

    public interface NameBuilder{
        HoppyBuilder name(String name);
    }

    public interface HoppyBuilder{
        HoppyBuilder hoppy(String hoppy);
        User build();
    }

    private static class UserStepBuilder implements IdBuiler,NameBuilder,HoppyBuilder{
        private Long id;
        private String name;
        private List<String> hoppies;

        @Override
        public User build() {
            return new User(id, name, hoppies);
        }

        @Override
        public HoppyBuilder hoppy(String hoppy) {
            hoppies.add(hoppy);
            return this;
        }

        @Override
        public HoppyBuilder name(String name) {
            this.name=name;
            hoppies=Lists.newArrayList();
            return this;
        }

        @Override
        public NameBuilder id(Long id) {
            this.id=id;
            return this;
        }
    }
}