Podcast
Questions and Answers
What does the Java 'implements' keyword do?
What does the Java 'implements' keyword do?
- Declares a variable that can hold a 32-bit signed integer
- Creates new objects
- Is used to implement an interface (correct)
- Tests a condition and executes a block if true
What is the purpose of the Java 'null' keyword?
What is the purpose of the Java 'null' keyword?
- Indicates that a reference does not refer to anything (correct)
- Declares a Java package
- Tests whether the object is an instance of a specified class or interface
- Declares a 64-bit integer variable
When is the Java 'protected' keyword used?
When is the Java 'protected' keyword used?
- As an access modifier to indicate that a method or variable may be accessed only in the class in which it is declared (correct)
- To specify that a method is implemented in native code using JNI
- To declare a variable that can hold a 64-bit integer
- To declare a Java package that includes classes
What is the role of the Java 'new' keyword?
What is the role of the Java 'new' keyword?
What does the Java 'instanceof' keyword test?
What does the Java 'instanceof' keyword test?
When is the Java 'native' keyword used?
When is the Java 'native' keyword used?
What does the 'public' keyword indicate in Java?
What does the 'public' keyword indicate in Java?
When is the 'return' keyword used in Java?
When is the 'return' keyword used in Java?
What does the 'volatile' keyword indicate in Java?
What does the 'volatile' keyword indicate in Java?
What is the purpose of the 'static' keyword in Java?
What is the purpose of the 'static' keyword in Java?
When would you use the 'transient' keyword in Java?
When would you use the 'transient' keyword in Java?
What does the 'this' keyword refer to in Java?
What does the 'this' keyword refer to in Java?
When would you use the 'throws' keyword in Java?
When would you use the 'throws' keyword in Java?
What is the role of the 'throw' keyword in Java?
What is the role of the 'throw' keyword in Java?
What does the 'try' keyword initiate in Java?
What does the 'try' keyword initiate in Java?
What is the significance of the 'strictfp' keyword in Java?
What is the significance of the 'strictfp' keyword in Java?
Study Notes
Java Keywords
Access Modifiers
- The
publickeyword indicates that the class, method, or variable can be accessed from anywhere in the program. - The
protectedkeyword is used when a class, method, or variable can be accessed within the same class and its subclasses.
Object Creation
- The
newkeyword is used to create a new instance of a class.
Type Checking
- The
instanceofkeyword tests whether an object is of a particular type or not.
Multithreading
- The
volatilekeyword indicates that a variable's value can change unexpectedly, and the program should always read the variable's current value.
Exception Handling
- The
throwskeyword is used to declare that a method may throw an exception. - The
throwkeyword is used to explicitly throw an exception. - The
trykeyword initiates a block of code that can throw an exception.
Memory Management
- The
transientkeyword is used to indicate that a variable should not be serialized.
Classes and Objects
- The
thiskeyword refers to the current object of the class.
Implementation
- The
implementskeyword is used to indicate that a class implements an interface.
Null Values
- The
nullkeyword represents a null reference or a variable that has no value.
Native Methods
- The
nativekeyword is used to declare a method that is implemented in a language other than Java.
Floating-Point Arithmetic
- The
strictfpkeyword is used to restrict the precision of floating-point calculations to ensure portability.
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Description
Test your knowledge of Java keywords with this quiz. Explore the usage and functionality of keywords such as 'if', 'implements', 'import', 'instanceof', and 'int'.
