To create a new program you first need to create a new project. When BlueJ is up and running you should see a window that looks something like this: The template is stored in the lib -> english -> templates -> newclass folder. You can also modifying the template that starts when creating new programs and classes. The file called fs with a text editor.This file is located in the lib directory in
You can alter some of the defaults for BlueJ my modifying Navigating to the BlueJ directory and double clicking on the bluej.bat icon. The icon you created when you downloaded and installed BlueJ or by In this example I will assume they have been downloaded to the desktop.
#Bluej program does not run download
You don't have to put them in the BlueJįolder, just remember where you download them to on your computer. These errors are reported by the compiler and they prevent the program from executing.Creating and Running programs in BlueJ Getting Started with BlueJĪnd installed BlueJ before completing the following steps.įrom the class web site. Syntax Errors are the errors that occur when we violate the rules of writing the statements of the programming language. Question 9Įxplain the following terms, giving an example of each. Errors are classified into three categories - Syntax Errors, Runtime Errors and Logical Errors. Question 8Įrrors are mistakes in a program that prevents it from its normal working. What are delimiters? Which is the default delimiter used in the Scanner class?Ī delimiter is a sequence of one or more characters that separates two tokens. Returns true if there is another line in the input of the Scanner object. Returns true if the Scanner object has another token in its input. It checks if the Scanner has another token in its input. It reads the input till the next complete token until the delimiter is encountered. It returns the read data as a char value. It returns the read data as a String value. It reads the complete token and then the first character is returned using the charAt(0) method. It places the cursor in the next line after reading the input. It places the cursor in the same line after reading the input.
#Bluej program does not run full
It reads the input till the end of line so it can read a full sentence including spaces. It reads the input only till the next complete token until the delimiter is encountered. The different next methods provided by Scanner class are next(), nextShort(), nextInt(), nextLong(), nextFloat(), nextDouble(), nextLine(), next().charAt(0). Scanner class provides various next methods to read these tokens from the stream.
The input received by Scanner class is broken into tokens using a delimiter pattern. We connect our Scanner class to this stream while creating its object. The data entered by the user through the keyboard is provided to our Java program with the help of standard input stream that is specified as System.in in the program. * Single line comment using multi line comment style */ Question 5Įxplain data input technique in a program using the Scanner class. For example, we can import all the classes present in the java.util package into our program using the below statement: Import statement is used to import built-in and user-defined packages and classes into our Java program. Question 2Įxplain the use of import statement with an example.
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