InetAddresses.isInetAddress(withScopeId));
        Inet6Address parsed;
        boolean isNumeric = scopeId.matches("\\d+");
        try {
          parsed = (Inet6Address) InetAddresses.forString(withScopeId);
        } catch (IllegalArgumentException e) {
          if (!isNumeric) {
            // Android doesn't recognize %interface as valid
            continue;
          }
          throw e;

func isUnsigned(t Type) bool       { return isBasic(t, IsUnsigned) }
func isFloat(t Type) bool          { return isBasic(t, IsFloat) }
func isComplex(t Type) bool        { return isBasic(t, IsComplex) }
func isNumeric(t Type) bool        { return isBasic(t, IsNumeric) }
func isString(t Type) bool         { return isBasic(t, IsString) }
func isIntegerOrFloat(t Type) bool { return isBasic(t, IsInteger|IsFloat) }

func isUnsigned(t Type) bool       { return isBasic(t, IsUnsigned) }
func isFloat(t Type) bool          { return isBasic(t, IsFloat) }
func isComplex(t Type) bool        { return isBasic(t, IsComplex) }
func isNumeric(t Type) bool        { return isBasic(t, IsNumeric) }
func isString(t Type) bool         { return isBasic(t, IsString) }
func isIntegerOrFloat(t Type) bool { return isBasic(t, IsInteger|IsFloat) }

	// Named and Alias, it also removes TypeParam.
	if n, ok := under.(*types.Named); ok {
		under = n.Underlying()
	}
	switch under := under.(type) {
	case *types.Basic:
		switch {
		case under.Info()&types.IsNumeric != 0:
			return &ast.BasicLit{Kind: token.INT, Value: "0"}
		case under.Info()&types.IsBoolean != 0:
			return &ast.Ident{Name: "false"}
		case under.Info()&types.IsString != 0:

			//    same type to succeed (this will result in an error
			//    because shifts of floats are not permitted)
			if x.mode == constant_ && y.mode == constant_ {
				toFloat := func(x *operand) {
					if isNumeric(x.typ) && constant.Sign(constant.Imag(x.val)) == 0 {
						x.typ = Typ[UntypedFloat]
					}
				}
				toFloat(x)
				toFloat(y)
			} else {
				check.convertUntyped(x, Typ[Float64])

			//    same type to succeed (this will result in an error
			//    because shifts of floats are not permitted)
			if x.mode == constant_ && y.mode == constant_ {
				toFloat := func(x *operand) {
					if isNumeric(x.typ) && constant.Sign(constant.Imag(x.val)) == 0 {
						x.typ = Typ[UntypedFloat]
					}
				}
				toFloat(x)
				toFloat(y)
			} else {
				check.convertUntyped(x, Typ[Float64])

		}
	}

	return stringEncoder(s), nil
}

func makeNumericString(s string) (e encoder, err error) {
	for i := 0; i < len(s); i++ {
		if !isNumeric(s[i]) {
			return nil, StructuralError{"NumericString contains invalid character"}
		}
	}

	return stringEncoder(s), nil
}

func makeUTF8String(s string) encoder {
	return stringEncoder(s)
}

		switch x.typ.(*Basic).kind {
		case UntypedBool:
			if !isBoolean(target) {
				return nil, nil, InvalidUntypedConversion
			}
		case UntypedInt, UntypedRune, UntypedFloat, UntypedComplex:
			if !isNumeric(target) {
				return nil, nil, InvalidUntypedConversion
			}
		case UntypedString:
			// Non-constant untyped string values are not permitted by the spec and

		switch x.typ.(*Basic).kind {
		case UntypedBool:
			if !isBoolean(target) {
				return nil, nil, InvalidUntypedConversion
			}
		case UntypedInt, UntypedRune, UntypedFloat, UntypedComplex:
			if !isNumeric(target) {
				return nil, nil, InvalidUntypedConversion
			}
		case UntypedString:
			// Non-constant untyped string values are not permitted by the spec and

public static boolean isAlpha(String); public static boolean isWhitespace(String); public static boolean isAlphaSpace(String); public static boolean isAlphanumeric(String); public static boolean isAlphanumericSpace(String); public static boolean isNumeric(String); public static boolean isNumericSpace(String); public static String defaultString(Object); public static String defaultString(Object, String); public static String reverse(String); public static String reverseDelimitedStri(String, String);...