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An empty string is a string instance of zero length, whereas a null string has no value at all.

An empty string is represented as are initialized with the value of the empty string by the Java Server Faces implementation.

Here is a link to a useful example on how to implement the is usually used for reading binary data.

It also provides convenience methods for reading certain data types. Enter an integer: 12 The number entered was: 12 Enter an integer: -56 The number entered was: -56 Enter an integer: 4.2 Invalid input type (must be an integer) Enter an integer: but i hate integers Invalid input type (must be an integer) Enter an integer: 3 The number entered was: 3 Enter an integer: 0 Exiting... Scanner; Scanner scanner = new Scanner(; //reads the input until it reaches the space println("Enter a string: "); String str =; println("str = " str); //reads until the end of line String a Line = Line(); //reads the integer println("Enter an integer num: "); int num = Int(); println("num = " num); //reads the double value println("Enter a double: "); double a Double = Double(); println("double = " a Double); //reads the float value, long value, boolean value, byte and short double a Float = Float(); long a Long = Long(); boolean a Boolean = Boolean(); byte a Byte = Byte(); short a Short = Short(); scanner.close(); Keyboard entry using Scanner is possible, as others have posted.

The Bean Validation model is supported by constraints in the form of annotations placed on a field, method, or class of a Java Beans component, such as a managed bean. User-defined constraints are called custom constraints. Several built-in constraints are available in the tag.

Any managed bean that contains Bean Validation annotations automatically gets validation constraints placed on the fields on a Java Server Faces application’s web pages.

Input validation the first line of defence for secure coding.

The Java programming language distinguishes between null and empty strings.

Especially considering that security advice has changed over time, it can be confusing.

I was motivated to write this blog because the best guide I found on input validation is very dated, and I wanted to provide clear, modern guidance on the importance of the topic.

The following example gives a simple example of an approach that can be used.

It reads the input from the user and checks if it is a valid double. Could easily be modified for different validation that you may require.

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Remember: input validation is not about stopping specific attacks, but instead a general defence for stopping any number of attacks.

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