Java 用lambda替换匿名内部类

我得到一个声纳的建议，将蛋白类改为lambda

List<StsTxn> collect = externalPayments.stream().map(new Function<PaymentExternal, Payment>() {

            @Override
            public Payment apply(PaymentExternal t) {
                Payment payment = new Payment();
                try {
                    BeanUtils.copyProperties(payment, t);
                } catch (IllegalAccessException | InvocationTargetException e) {
                    logger.error(e.getMessage(), e);
                }
                return payment;
            }
        }).

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如果您使用的是IntelliJ Idea，则按Alt+Enter/Return会自动将其转换为lambda

如果必须手动执行此操作，则如下所示：

List<StsTxn> collect = externalPayments.stream().map( t -> {
    Payment = new Payment();
    //try-catch block
    return payment;
});

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在Java-8中，JVM将自动查找相关方法并覆盖它，但您只能将此功能用于功能接口

 public Payment createPayment(

    List<StsTxn> collect = externalPayments.stream().map(
    t -> {
    Payment payment = new Payment();
    try {
           BeanUtils.copyProperties(payment, t);
    } catch (IllegalAccessException | InvocationTargetException e) {
           logger.error(e.getMessage(), e);
    }
    return payment;
 })

t->{Payment Payment=新付款；尝试{BeanUtils.copyPropertiespayment，t；}捕获非法访问异常|调用目标异常{logger.errore.getMessage，e；}返回付款；}？任何IDE都会建议，您使用哪一个？