Equals("true", StringComparison.OrdinalIgnoreCase) // Trueīool result = "False".Equals("true", StringComparison.OrdinalIgnoreCase) // Falseĭepending on what you want to achieve, an extension method might be a good option. You can use TryParse which is the same as Parse. The Boolean function is useful when an explicit conversion is desired or when using. For example, If ( 'true', 1, 0 ) will return 1 as the text string 'true' is automatically converted to a Boolean. We can see that this method also succeeds in converting our String: assertThat (Boolean.valueOf ( 'true' )). However, there are a few points that we ought to take into consideration. The conversions from a primitive boolean value and a Boolean object to a string are pretty similar. But, as we know, there are two boolean types in Java: the primitive boolean and the object Boolean. Boolean.valueOf () Boolean.valueOf () also lets us pass in a String, but this method returns a Boolean class instance instead of a primitive boolean. Converting a boolean value to a string is a simple task in Java. In most cases, type coercion happens automatically and the Boolean function need not be used explicitly. In other words, this method is excellent for turning a String into a boolean. This is not exactly a direct conversion method and I personally prefer any of the above, but if for some reason you don't have access to them, you can use this alternative. OP, you can convert a string to type Boolean by using any of the methods stated below: string sample 'True' bool myBool bool.Parse (sample) // Or bool myBool Convert.ToBoolean (sample) bool.Parse expects one parameter which in this case is sample. A Boolean value is true, false, or blank. bool success = bool.TryParse("True", out bool result) // success: Trueīool success = bool.TryParse("False", out bool result) // success: Trueīool success = bool.TryParse(null, out bool result) // success: Falseīool success = bool.TryParse("thisIsNotABoolean", out bool result) // success: False Also, the converted value now appears in an out bool result output parameter instead of being returned by the function. If the String object returned by the ToString(IFormatProvider) method is to be written to an XML file, its String.ToLowerInvariant method should be called first to convert it to lowercase. Similar to bool.Parse except that it doesn't throw any exceptions directly, instead it returns a boolean value indicating whether or not the conversion could be performed. Note that XML is case-sensitive, and that the XML specification recognizes 'true' and 'false' as the valid set of Boolean values. (case insensitive)īool result = ("False") īool result = ("thisIsNotABoolean") īool.TryParse(string value, out bool result) Valid, also TRUE, FALSE, true, false, trUE, FAlse, etc. Note that both will throw a FormatException if the input string does not represent a boolean, whereas if the input string is null, bool.Parse will throw an ArgumentNullException while just returns false. I will proceed to explain some of them below:īool.Parse(string value) or (string value)īoth methods are quite similar in that they both take a string as their input value and return the boolean representation of that string as their output value. Of course, the performance will be worse than executing the code directly because the expression have to parsed into an abstract syntax tree (AST) before it can be evaluated.C# offers several ways to convert a string value to a boolean value. Long result = (Long) jExpression.evaluate(context) JexlContext stores the values for variables used in an JexlExpression JexlExpression jExpression = jexl.createExpression(expression) let boolString 'true' let boolValue (boolString 'true') console.log(boolValue) // true. If both values are the same, it will return the boolean value true, otherwise, it will return the boolean value false. Dim A, B, Check A 5: B 5 Initialize variables. If the expression evaluates to a nonzero value, CBool returns True, otherwise, it returns False. ' Expressions are commonly used with the conditional if keyword in a workflow file to determine whether a step should run. For more information about contexts, see ' Contexts. You can combine literals, context references, and functions using operators. JexlEngine jexl = new JexlBuilder().create() In this case, you want to convert a string to a boolean, which means you'll compare it to the string 'true'. This example uses the CBool function to convert an expression to a Boolean. An expression can be any combination of literal values, references to a context, or functions. Haven't tested the code below, but you can give it a go. () Returns a string of either true or false depending upon the value of the object. However, if one really wants to evaluate a an expression coming from a String, say when the string comes from user input, then there is a library called JExl that let's you do this:Īdd the following lines to your maven pom.xml If you want to evaluate the result of the expression "(a^b)|c" where a, b, and c are the variables defined above, just execute the expression directly as java code as stated in other answers.
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