lombok的@Builder导致初始化字段无效解决办法

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当用@Builder注解时，类里面的初始化字段就无效，比如下面类中的totalAmt和lineNum字段就会置为null。

@Builder
public class FileExport {
    private String charset;
    private String[] fields;
    private String amtField;
    private BigDecimal totalAmt=BigDecimal.ZERO;
    private AtomicLong lineNum=new AtomicLong();
    private String delimiter;
    private PrintWriter writer;
}

对于这种情况，可以在需要保留默认值的字段上加上@Builder.Default注解解决

@Builder
public class FileExport {
    private String charset;
    private String[] fields;
    private String amtField;
    @Builder.Default
    private BigDecimal totalAmt=BigDecimal.ZERO;
    @Builder.Default
    private AtomicLong lineNum=new AtomicLong();
    private String delimiter;
    private PrintWriter writer;
}