How many interfaces are there in a collection in java with example

How many interfaces are there in a collection in java with example

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In Java, a collection is an object that stores multiple values and provides operations to manipulate those values. A collection can have various types of interfaces, each serving a specific purpose. Here are some common interfaces in a collection with examples:

Example:

import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
List colors = new ArrayList<>();
colors.add("Red");
colors.add("Green");
colors.add("Blue");
System.out.println("Colors list: " + colors);
// Accessing elements by index
String firstColor = colors.get(0); // prints "Red"
}
}

Example:

import java.util.HashSet;
import java.util.Set;
public class Main {
public static void main(String[] args) {
Set colors = new HashSet<>();
colors.add("Red");
colors.add("Green");
colors.add("Blue");
System.out.println("Colors set: " + colors);
// No duplicates allowed
colors.add("Blue"); // does not add the duplicate value
}
}

Example:

import java.util.HashMap;
import java.util.Map;
public class Main {
public static void main(String[] args) {
Map<String, String> countries = new HashMap<>();
countries.put("USA", "United States");
countries.put("UK", "United Kingdom");
System.out.println("Countries map: " + countries);
// Retrieving values by keys
String countryName = countries.get("USA"); // prints "United States"
}
}

Example:

import java.util.LinkedList;
import java.util.Queue;
public class Main {
public static void main(String[] args) {
Queue messages = new LinkedList<>();
messages.add("Hello");
messages.add("World");
System.out.println("Messages queue: " + messages);
// Retrieving the first element
String message = messages.poll(); // prints "Hello"
}
}

Example:

import java.util.Stack;
public class Main {
public static void main(String[] args) {
Stack messages = new Stack<>();
messages.push("Hello");
messages.push("World");
System.out.println("Messages stack: " + messages);
// Retrieving the top element
String message = messages.pop(); // prints "World"
}
}

These are some of the most common interfaces in a Java collection. Each interface has its own specific use cases and is suited for different types of data storage and manipulation.

How many types of interfaces are there in Java?

I'd be happy to help!

In the world of Java programming, interfaces play a crucial role in defining the behavior and structure of an object-oriented program. An interface is a abstract construct that defines a contract or a protocol for its implementations. It's like a blueprint or a set of instructions on how to behave.

Now, let's talk about the different types of interfaces in Java! There are several types, but I'll cover at least 10:

Example: java.util.function.Predicate<T> is a functional interface that takes in an input and returns a boolean value indicating whether the input meets certain criteria.

Example: java.lang.Cloneable is a marker interface used to indicate that an object can be cloned.

Example: java.awt.print.PrinterJob has no concrete methods, but it's a PVI because its implementations must provide their own logic.

Example: java.lang.Runnable has a single concrete method run(), which is meant to be overridden by its implementations.

Example: java.awt.print.Pageable has several abstract methods related to printing pages.

Example: java.sql.Statement is an interface that inherits from both java.sql.PreparedStatement and java.sql.ResultSet.

Example: javax.persistence.Entity is a tagged interface used in JPA (Java Persistence API) to identify an entity bean.

Example: java.util.Map<K, V> is a parameterized interface for maps, where K represents the key type and V represents the value type.

Example: java.awt.event.MouseListener has several methods (like mouseClicked()) that can be implemented differently by various mouse listener classes.

Example: javax.swing.table.TableModel has abstract methods and some implementation-specific logic, allowing custom models to inherit from this interface.

These are just a few of the many types of interfaces in Java. Understanding each type's unique characteristics will help you write more effective and reusable code.