lomlok使用builder时的默认值与手动设置的默认值

README.md

仔细看，builder为默认值生成了一个函数

private static BigDecimal $default$account() {
  return BigDecimal.ZERO;
}

以及在builder内部生成了一个标记

private boolean account$set;

该标记在值被更新时记录

  public AccountNumberVoBuilder account(final BigDecimal account) {
    this.account = account;
    account$set = true;
    return this;
  }

并在build时进行检测，是否使用默认值

		@java.lang.SuppressWarnings("all")
		public AccountNumberVo build() {
			BigDecimal account = this.account;
			if (!account$set) account = AccountNumberVo.$default$account();
			return new AccountNumberVo(account, score);
		}

AccountNumberVo.java

@Data
@Builder
@AllArgsConstructor
public class AccountNumberVo {
	@Builder.Default
	private BigDecimal account = BigDecimal.ZERO;
	private Integer score = 0;
	
	public AccountNumberVo(){
		this.account = BigDecimal.ZERO;
		this.score = 0;
	}
}

AccountNumberVoGE.java

// Generated by delombok at Wed Dec 18 14:55:29 CST 2019

import java.math.BigDecimal;

public class AccountNumberVo {
	private BigDecimal account;
	private Integer score = 0;

	public AccountNumberVo() {
		this.account = BigDecimal.ZERO;
		this.score = 0;
	}

	@java.lang.SuppressWarnings("all")
	private static BigDecimal $default$account() {
		return BigDecimal.ZERO;
	}


	@java.lang.SuppressWarnings("all")
	public static class AccountNumberVoBuilder {
		@java.lang.SuppressWarnings("all")
		private boolean account$set;
		@java.lang.SuppressWarnings("all")
		private BigDecimal account;
		@java.lang.SuppressWarnings("all")
		private Integer score;

		@java.lang.SuppressWarnings("all")
		AccountNumberVoBuilder() {
		}

		@java.lang.SuppressWarnings("all")
		public AccountNumberVoBuilder account(final BigDecimal account) {
			this.account = account;
			account$set = true;
			return this;
		}

		@java.lang.SuppressWarnings("all")
		public AccountNumberVoBuilder score(final Integer score) {
			this.score = score;
			return this;
		}

		@java.lang.SuppressWarnings("all")
		public AccountNumberVo build() {
			BigDecimal account = this.account;
			if (!account$set) account = AccountNumberVo.$default$account();
			return new AccountNumberVo(account, score);
		}

		@java.lang.Override
		@java.lang.SuppressWarnings("all")
		public java.lang.String toString() {
			return "AccountNumberVo.AccountNumberVoBuilder(account=" + this.account + ", score=" + this.score + ")";
		}
	}

	@java.lang.SuppressWarnings("all")
	public static AccountNumberVoBuilder builder() {
		return new AccountNumberVoBuilder();
	}

	@java.lang.SuppressWarnings("all")
	public BigDecimal getAccount() {
		return this.account;
	}

	@java.lang.SuppressWarnings("all")
	public Integer getScore() {
		return this.score;
	}

	@java.lang.SuppressWarnings("all")
	public void setAccount(final BigDecimal account) {
		this.account = account;
	}

	@java.lang.SuppressWarnings("all")
	public void setScore(final Integer score) {
		this.score = score;
	}

	@java.lang.Override
	@java.lang.SuppressWarnings("all")
	public boolean equals(final java.lang.Object o) {
		if (o == this) return true;
		if (!(o instanceof AccountNumberVo)) return false;
		final AccountNumberVo other = (AccountNumberVo) o;
		if (!other.canEqual((java.lang.Object) this)) return false;
		final java.lang.Object this$account = this.getAccount();
		final java.lang.Object other$account = other.getAccount();
		if (this$account == null ? other$account != null : !this$account.equals(other$account)) return false;
		final java.lang.Object this$score = this.getScore();
		final java.lang.Object other$score = other.getScore();
		if (this$score == null ? other$score != null : !this$score.equals(other$score)) return false;
		return true;
	}

	@java.lang.SuppressWarnings("all")
	protected boolean canEqual(final java.lang.Object other) {
		return other instanceof AccountNumberVo;
	}

	@java.lang.Override
	@java.lang.SuppressWarnings("all")
	public int hashCode() {
		final int PRIME = 59;
		int result = 1;
		final java.lang.Object $account = this.getAccount();
		result = result * PRIME + ($account == null ? 43 : $account.hashCode());
		final java.lang.Object $score = this.getScore();
		result = result * PRIME + ($score == null ? 43 : $score.hashCode());
		return result;
	}

	@java.lang.Override
	@java.lang.SuppressWarnings("all")
	public java.lang.String toString() {
		return "AccountNumberVo(account=" + this.getAccount() + ", score=" + this.getScore() + ")";
	}

	@java.lang.SuppressWarnings("all")
	public AccountNumberVo(final BigDecimal account, final Integer score) {
		this.account = account;
		this.score = score;
	}
}

default-value-in-lombok-how-to-init-default-with-both-constructor-and-builder