What this deck covers
This deck focuses on Methods Passing And Returning References, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science a.
AP Computer Science a Flashcards: Methods Passing And Returning References
Study Methods Passing And Returning References in AP Computer Science a with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science a
Methods Passing And Returning References
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QUESTION
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Which keyword is necessary to return an object from a method?
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ANSWER
return. Required for all method returns.
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Flashcard 1: Which keyword is necessary to return an object from a method?
Answer: return. Required for all method returns.
Flashcard 2: What will 'return null;' do in a method returning a reference?
Answer: Returns no object, just null. Explicitly returns no object reference.
Flashcard 3: What occurs if a method returns null by default?
Answer: No object is returned; it represents nothing. Null indicates no object reference exists.
Flashcard 4: What is the result of passing an object to a method by reference?
Answer: The method can modify the object's fields. Reference passing enables object modification.
Flashcard 5: How do you define a method that accepts an object as an argument?
Answer: Use the object's class as parameter type. Parameter type must match the object's class.
Flashcard 6: Identify the correct method signature for returning a MyClass object.
Answer: public MyClass methodName(). Return type matches the class name.
Flashcard 7: How do you return an object reference from a method?
Answer: Use the 'return' keyword followed by the object. Return statement sends object reference back.
Flashcard 8: What is the consequence of returning a null reference from a method?
Answer: It signifies no object is being returned. Null means no valid object reference.
Flashcard 9: What is the outcome of passing a null reference to a method?
Answer: NullPointerException if dereferenced. Accessing null reference throws runtime exception.
Flashcard 10: State the method signature for a method returning an object of class MyClass.
Answer: public MyClass methodName(). Method signature shows return type and parameters.
Flashcard 11: What is the effect of returning 'this' in a method?
Answer: Returns the current instance of the class. Enables method chaining and self-reference.
Flashcard 12: What is the syntax to pass an object as a parameter in a method?
Answer: methodName(ObjectType objectName). Parameter syntax includes type and variable name.
Flashcard 13: What is the result of passing an object to a method by reference?
Answer: The method can modify the object's fields. Reference passing enables object modification.
Flashcard 14: When is a new object created during method execution?
Answer: When using 'new' keyword inside the method. Constructor calls create new object instances.
Flashcard 15: What type of method can return an object reference in Java?
Answer: Any method with a non-void return type. Non-void methods can return object references.
Flashcard 16: What will 'return this;' do in a method of a class?
Answer: Returns the current object reference. 'this' refers to the current object instance.
Flashcard 17: Which keyword is necessary to return an object from a method?
Answer: return. Required for all method returns.
Flashcard 18: What is the outcome if you pass a null object to a method?
Answer: Risk of NullPointerException if dereferenced. Null references cause exceptions when used.
Flashcard 19: How do you indicate a method returns no object?
Answer: Use 'void' as the method's return type. Void indicates no return value expected.
Flashcard 20: What is the default return value of a method that returns an object?
Answer: null. Methods return null when no object is provided.
Flashcard 21: What will 'return this;' do in a method of a class?
Answer: Returns the current object reference. 'this' refers to the current object instance.
Flashcard 22: Which statement correctly passes an object to a method?
Answer: methodName(object);. Object name without parentheses passes reference.
Flashcard 23: Which option correctly returns an object of type String?
Answer: return "Example";. String literals return String object references.
Flashcard 24: Identify the error: 'public String getName() { return name }'
Answer: Missing semicolon after 'name'. Missing semicolon terminates return statement.
Flashcard 25: What does 'return null;' indicate in a method returning an object?
Answer: No object is being returned. Explicit way to return no object.
Flashcard 26: Which statement correctly returns an object created within a method?
Answer: return new ObjectType();. Constructor creates and returns new object.
Flashcard 27: What is the syntax to pass an object as a parameter in a method?
Answer: methodName(ObjectType objectName). Parameter syntax includes type and variable name.
Flashcard 28: Identify the correct method signature for returning a MyClass object.
Answer: public MyClass methodName(). Return type matches the class name.
Flashcard 29: Which statement correctly passes an object to a method?
Answer: methodName(object);. Object name without parentheses passes reference.
Flashcard 30: Find and correct the error: 'return objectName()' for returning an object.
Answer: Correct: 'return objectName;'. Parentheses invoke method; remove for variable return.
Flashcard 31: How do you handle a null return value from a method?
Answer: Check for null before using the return value. Prevents NullPointerException when accessing.
Flashcard 32: What happens if you modify an object's field inside a method?
Answer: The modification persists outside the method. Object state changes persist after method ends.
Flashcard 33: What is the effect of modifying an object within a method?
Answer: Changes persist outside the method. Reference passing means original object is modified.
Flashcard 34: State the method signature for a method returning an object of class MyClass.
Answer: public MyClass methodName(). Method signature shows return type and parameters.
Flashcard 35: What is the outcome of passing a null reference to a method?
Answer: NullPointerException if dereferenced. Accessing null reference throws runtime exception.
Flashcard 36: Identify the result of modifying a primitive data type passed to a method.
Answer: Modification does not persist outside. Primitives are passed by value, not reference.
Flashcard 37: Which statement correctly returns an object created within a method?
Answer: return new ObjectType();. Constructor creates and returns new object.
Flashcard 38: What happens when you pass a reference of an object to a method?
Answer: The method can modify the object's state. Reference allows access to the original object.
Flashcard 39: Identify the error: 'public void method() { return new MyClass(); }'
Answer: Error: method has void return type. Void methods cannot return any value.
Flashcard 40: What will 'return null;' do in a method returning a reference?
Answer: Returns no object, just null. Explicitly returns no object reference.
Flashcard 41: Identify the result of modifying a primitive data type passed to a method.
Answer: Modification does not persist outside. Primitives are passed by value, not reference.
Flashcard 42: Find and correct the error: 'return objectName()' for returning an object.
Answer: Correct: 'return objectName;'. Parentheses invoke method; remove for variable return.
Flashcard 43: Which option correctly returns an object of type String?
Answer: return "Example";. String literals return String object references.
Flashcard 44: When passing an object to a method, what is actually passed?
Answer: The reference to the object. Memory address, not the entire object.
Flashcard 45: When passing an object to a method, what is actually passed?
Answer: The reference to the object. Memory address, not the entire object.
Flashcard 46: How do you return an object reference from a method?
Answer: Use the 'return' keyword followed by the object. Return statement sends object reference back.
Flashcard 47: What does 'null' signify when returned by a method?
Answer: The method does not return an actual object. Null represents absence of an object reference.
Flashcard 48: How do you define a method that accepts an object as an argument?
Answer: Use the object's class as parameter type. Parameter type must match the object's class.
Flashcard 49: What is the default return value of a method that returns an object?
Answer: null. Methods return null when no object is provided.
Flashcard 50: When is a new object created during method execution?
Answer: When using 'new' keyword inside the method. Constructor calls create new object instances.
Flashcard 51: What does 'return null;' indicate in a method returning an object?
Answer: No object is being returned. Explicit way to return no object.
Flashcard 52: Identify the error: 'public void method() { return new MyClass(); }'
Answer: Error: method has void return type. Void methods cannot return any value.
Flashcard 53: What does it mean to pass an object reference in Java?
Answer: Passing the memory address of the object. Objects are passed by reference, not value.
Flashcard 54: What type of method can return an object reference in Java?
Answer: Any method with a non-void return type. Non-void methods can return object references.
Flashcard 55: What must match when a method returns an object?
Answer: The return type and the object's type. Type compatibility ensures valid returns.
Flashcard 56: What is the consequence of returning a null reference from a method?
Answer: It signifies no object is being returned. Null means no valid object reference.
Flashcard 57: What happens if you modify an object's field inside a method?
Answer: The modification persists outside the method. Object state changes persist after method ends.
Flashcard 58: Identify the error: 'public String getName() { return name }'
Answer: Missing semicolon after 'name'. Missing semicolon terminates return statement.
Flashcard 59: What must match when a method returns an object?
Answer: The return type and the object's type. Type compatibility ensures valid returns.
Flashcard 60: Identify the keyword used to return an object reference from a method.
Answer: return. Basic keyword for returning any value or reference.
Flashcard 61: What is the effect of returning 'this' in a method?
Answer: Returns the current instance of the class. Enables method chaining and self-reference.
Flashcard 62: What does 'null' signify when returned by a method?
Answer: The method does not return an actual object. Null represents absence of an object reference.
Flashcard 63: Identify the keyword used to return an object reference from a method.
Answer: return. Basic keyword for returning any value or reference.
Flashcard 64: What should a method return if it is declared to return an object?
Answer: An object or a reference to an object. Return type determines what can be returned.
Flashcard 65: How do you handle a null return value from a method?
Answer: Check for null before using the return value. Prevents NullPointerException when accessing.
Flashcard 66: What occurs if a method returns null by default?
Answer: No object is returned; it represents nothing. Null indicates no object reference exists.
Flashcard 67: What is the outcome if you pass a null object to a method?
Answer: Risk of NullPointerException if dereferenced. Null references cause exceptions when used.
Flashcard 68: What is the effect of modifying an object within a method?
Answer: Changes persist outside the method. Reference passing means original object is modified.
Flashcard 69: How do you indicate a method returns no object?
Answer: Use 'void' as the method's return type. Void indicates no return value expected.
Flashcard 70: What happens when you pass a reference of an object to a method?
Answer: The method can modify the object's state. Reference allows access to the original object.
Flashcard 71: What should a method return if it is declared to return an object?
Answer: An object or a reference to an object. Return type determines what can be returned.