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What is a Vector in Java and how does it differ from a traditional array?
What is a Vector in Java and how does it differ from a traditional array?
A Vector is a dynamic array in Java that can grow or shrink as needed, allowing it to store an unlimited number of elements, unlike a traditional array which has a fixed size.
Explain the purpose of the Vector(int size) constructor.
Explain the purpose of the Vector(int size) constructor.
The Vector(int size) constructor creates a Vector with an initial capacity specified by the given size.
How do you add an element at a specific index in a Vector?
How do you add an element at a specific index in a Vector?
You can add an element at a specific index in a Vector using the method add(int index, Object).
What method is used to update an element in a Vector and how does it work?
What method is used to update an element in a Vector and how does it work?
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Describe the functionality of the remove(Object) method in a Vector.
Describe the functionality of the remove(Object) method in a Vector.
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What are the differences between the Vector constructors Vector(int size) and Vector(int size, int incr)?
What are the differences between the Vector constructors Vector(int size) and Vector(int size, int incr)?
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What advantages do Vectors offer as part of the Java Collection framework?
What advantages do Vectors offer as part of the Java Collection framework?
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How would you create an empty Vector in Java?
How would you create an empty Vector in Java?
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Study Notes
Vectors in Java
- Vectors are dynamic arrays, meaning their size can change as needed (grow or shrink).
- Unlike fixed-size arrays, vectors can store any number of elements.
- They are part of the Java Collections Framework, found in the
java.utilpackage. - Like arrays, vector elements are accessed by integer index.
Vector Constructors
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Vector(): Creates a vector with default initial capacity of 10. -
Vector(int size): Creates a vector with specified initial capacity. -
Vector(int size, int incr): Creates a vector with a specified initial capacity and increment size (used when resizing). -
Vector(Collection c): Creates a vector containing elements from a given collection.
Vector Creation Examples
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Vector<Integer> v = new Vector<Integer>(5);: Creates an Integer vector with initial capacity set to 5. -
Vector<String> vec = new Vector<String>();: Creates a String vector with default capacity.
Vector Operations
Adding Elements
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add(Object): Adds an element to the end of the vector. -
add(int index, Object): Adds an element at a specified index.
Updating Elements
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set(index, element): Replaces an element at a given index with a new element.
Removing Elements
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remove(Object): Removes the first occurrence of a specific object from the vector. -
remove(int index): Removes the element at a given index.
Iterating Through Vector
- Vectors can be iterated using a basic
forloop and theget()method to access elements by index or an advanced for loop.
Other Important Methods
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size(): Returns the number of elements in the vector. -
capacity(): Returns the current capacity of the vector. -
isEmpty(): Checks if the vector is empty. -
clear(): Removes all elements from the vector. -
indexOf(element): Returns the index of the first occurrence of a specific element. -
trimToSize(): Reduces the vector's capacity to its current size.
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Description
This quiz covers the fundamental concepts of Vectors in Java, including their properties, constructors, and operations. Learn how to create and manipulate dynamic arrays with the Java Collections Framework effectively.
