Interface CommandLine.ITypeConverter<K>

When parsing command line arguments and initializing fields annotated with @Option or @Parameters, String values can be converted to any type for which a ITypeConverter is registered.

This interface defines the contract for classes that know how to convert a String into some domain object. Custom converters can be registered with the CommandLine.registerConverter(Class, ITypeConverter) method.

Java 8 lambdas make it easy to register custom type converters:

  commandLine.registerConverter(java.nio.file.Path.class, s -> java.nio.file.Paths.get(s));
  commandLine.registerConverter(java.time.Duration.class, s -> java.time.Duration.parse(s));

Built-in type converters are pre-registered for the following java 1.5 types:

• all primitive types
• all primitive wrapper types: Boolean, Byte, Character, Double, Float, Integer, Long, Short
• any enum
• java.io.File
• java.math.BigDecimal
• java.math.BigInteger
• java.net.InetAddress
• java.net.URI
• java.net.URL
• java.nio.charset.Charset
• java.sql.Time
• java.util.Date
• java.util.UUID
• java.util.regex.Pattern
• StringBuilder
• CharSequence
• String