@FunctionalInterface public interface Converter
Object convert(Type targetType, Object value) throws ConvertException
targetType - 目标Type,非泛型类使用value - 原始值,如果对象实现了此接口,则value为thisConvertException - 转换无法正常完成或转换异常时抛出此异常default <T> T convert(Type targetType, Object value, T defaultValue)
T - 目标类型targetType - 目标类型value - 值defaultValue - 默认值static Converter identity()
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