All Flashcards
What are the general steps to call a method in Java?
- Create an object of the class (if the method is non-static). 2. Use dot notation:
objectName.methodName(parameters);
orClassName.methodName(parameters);
for static methods.
What are the steps to define a method?
- Declare the method signature (access modifier, return type, method name, parameters). 2. Write the method body (the code that performs the task).
What are the steps to call a void method?
- Create an object of the class (if non-static). 2. Use dot notation:
objectName.methodName(parameters);
orClassName.methodName(parameters);
for static methods. No return value is assigned.
What are the steps to call a non-void method?
- Create an object of the class (if non-static). 2. Use dot notation:
objectName.methodName(parameters);
orClassName.methodName(parameters);
for static methods. 3. Store or use the return value.
What are the steps to create a class in Java?
- Declare the class using the
class
keyword. 2. Define instance variables (attributes). 3. Define methods (behaviors). 4. Optionally, define constructors to initialize objects.
What are the steps to compile and run a Java program?
- Write the Java code in a
.java
file. 2. Compile the code usingjavac YourFile.java
. 3. Run the compiled code usingjava YourFile
.
What are the steps to create an object in Java?
- Declare a variable of the class type. 2. Use the
new
keyword followed by the class constructor to create a new object. 3. Assign the new object to the variable.
What are the steps to declare a variable?
- Specify the data type. 2. Provide a name for the variable. 3. Optionally, initialize the variable with a value. Example:
int age = 25;
What are the steps to use an if statement?
- Write the
if
keyword followed by a boolean expression in parentheses. 2. Write the code to be executed if the expression is true within curly braces. 3. Optionally, addelse
orelse if
blocks for alternative conditions.
What are the steps to use a for loop?
- Write the
for
keyword followed by initialization, condition, and increment/decrement statements in parentheses. 2. Write the code to be executed in each iteration within curly braces.
What are the differences between void and non-void methods?
Void: Performs actions, no return value. Non-void: Performs actions, returns a value.
What are the differences between static and non-static methods?
Static: Belongs to the class, called using class name. Non-static: Belongs to the object, called using object name.
Compare calling static vs. non-static methods.
Static: ClassName.methodName()
. Non-static: objectName.methodName()
. Static methods don't require an object instance.
What are the differences between parameters and arguments?
Parameters: Variables in method definition. Arguments: Actual values passed when calling the method.
Compare public, private, and protected access modifiers.
Public: Accessible from anywhere. Private: Accessible only within the class. Protected: Accessible within the class, subclass, and package.
Compare System.out.print()
and System.out.println()
.
print()
: Prints to the console without a newline. println()
: Prints to the console with a newline.
Compare if
and switch
statements.
if
: Evaluates boolean expressions. switch
: Evaluates a single variable against multiple constant values.
Compare for
and while
loops.
for
: Used when the number of iterations is known. while
: Used when the number of iterations is unknown.
Compare classes and objects.
Classes: Blueprint for creating objects. Objects: Instances of a class.
Compare local and instance variables.
Local: Declared inside a method, scope limited to that method. Instance: Declared inside a class but outside any method, belongs to an object.
What is a method?
A block of code that performs a specific task.
What is a void method?
A method that performs an action but does not return a value.
What is a non-void method?
A method that performs an action and returns a value.
What is a static method?
A method that belongs to the class itself, not to any specific object.
What is a non-static method?
A method that operates on a specific object.
What is a method signature?
The method name and the parameter list (types and names of inputs).
Define 'parameter'.
Input values that a method can accept to modify its behavior.
What does 'dot notation' refer to?
The way to call methods using the class/object name, a dot, and the method name.
What is the purpose of methods?
To organize code into reusable blocks, making programs more modular and easier to manage.
What is the behavior of a method?
The actions an object can perform.