A reserved term (also known as a reserved identifier) in a programming language is a word that can’t be used as an identifier, such as the name of a variable, method, or mark – it’s “reserved from usage.” A reserved word may or may not have any meaning, according to this syntactic description. A keyword, which is a term with special meaning in a specific sense, is a closely related and often conflated concept. This is an example of a semantic meaning. Names in a regular library that aren’t built into the vocabulary, on the other hand, aren’t called reserved words or keywords.
1. In which of the following situations will most likely no counting loop be used?
- Addition of the numbers between 0 and hundred.
- Output of a table with Fahrenheit and its corresponding Celsius values.
- Prompt the user until a correct entry has been made.
- Ten-time output of the computer sound signal.
2. Which of the following is a reserved word ?
3. What method of a content pane changes its background color?
- setBackground (Color c)
- setForeground (Color c)
- add ()
- getBackground ()
4. Which method will the program end immediately?
- System.gc ()
- System.exit (0)
- System.setErr ()
- return ()
5. What kind of object determines how GUI components are arranged in a content area?
- The layer organizer.
- The Layout Programmer.
- The layout manager.
- The Frame Positioner.
6. Can the program put text in JTextField?
- No, only the user can enter text.
- Yes, by using one JLabel.
- Yes, by setEditable()using.
- Yes, by setText()using.
7. Which is the class for swing labels?
8. Which method is used JTextFieldto read text from one ?
9. What is an expression ?
- The same as a statement.
- An expression is a list of instructions that make up a program.
- An expression is a combination of literals, operators, variables, and parentheses to calculate a value.
- An expression is a number that is expressed in numbers.
10. What is a primitive data type in Java ?
- A method to represent values ??that are so useful that they are an integral part of the language.
- An easy way to represent numbers.
- The part of Java that matches the older programming languages.
- A data type that can not be used as part of an object.
11. How many objects of a given class can be constructed in a program?
- Only one object is constructed per run.
- As many as the program requires.
- Only one per class.
- One object per variable.
12. What is a reference to an object?
- One of the methods of the object.
- One of the variables of the object.
- Data where the object can be found.
- A place in a program that creates the object.
13. Does every variable in Java need a data type?
- No – only numeric variables need a data type.
- No – a data type is optional.
- Yes – all variables are of the same data type.
- Yes – every variable must be declared with its data type.
14. Suppose a particular data item does not use a primitive data type. What does it have to be?
- An object.
- A number.
- A literal.
- A Boolean element.
15. How many alternatives are there for a single if-else statement?
Primitive data types may or may not have a one-to-one correspondence with objects in the computer’s memory, depending on the language and its implementation. However, operations on simple primitive data types are commonly thought to be the quickest language constructs. [requires citation] For example, integer addition can be done in a single machine instruction, and some processors have special instructions for processing multiple characters in a single instruction. [requires citation] The C specification specifies that “a ‘plain’ int object has the natural size indicated by the execution environment’s architecture.”