SingularBuilderExample.java

package de.plushnikov.builder.singular;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import lombok.Builder;
import lombok.Singular;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Builder
public class SingularBuilderExample {
  private String name;
  private int age;

  @Singular
  private List<String> occupations;

  @Singular
  private ImmutableSet<Float> occupation2s;

  @Singular
  private Map<Integer, Float> cars;

  @Singular
  private ImmutableMap<String, Float> car2s;

  public static void main(String[] args) {
    SingularBuilderExampleBuilder builder = SingularBuilderExample.builder().age(34);
    System.out.println(builder.occupations(Arrays.asList("1234", "2345")).build());
    System.out.println(builder.occupation("aaa").build());

    System.out.println(builder.occupation2(2.0f).build());
    System.out.println(builder.occupation2(2.0f).build());

    System.out.println(builder.cars(new HashMap<Integer, Float>()).build());
    System.out.println(builder.car(1, 2.0f).build());

    System.out.println(builder.car2s(new HashMap<String, Float>()).build());
    System.out.println(builder.car2("1", 2.0f).build());
  }

}