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Java APIs & Frameworks
Java Useful Resources
- Java - Synchronization
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Java Networking
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- Java - URL Class
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Java Collections
Java List Interface
Java Queue Interface
Java Map Interface
- Java - Map Interface
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- Java - The IdentityHashMap Class
Java Set Interface
- Java - Set Interface
- Java - HashSet
- Java - EnumSet
- Java - LinkedHashSet
- Java - SortedSet Interface
- Java - TreeSet
Java Data Structures
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Java Collections Algorithms
Java Miscellaneous
- Java - Recursion
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- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
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Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
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- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
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Java Set Interface
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- Java - HashSet
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- Java - SortedSet Interface
- Java - TreeSet
Java Data Structures
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Java Collections Algorithms
Java Miscellaneous
- Java - Recursion
- Java - Regular Expressions
- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
- Java - Array Methods
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
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- Java - Hidden Classes
- Java - Compact Number Formatting
Java APIs & Frameworks
Java Useful Resources
Java Map Interface
- Java - Map Interface
- Java - HashMap
- Java - LinkedHashMap
- Java - WeakHashMap
- Java - EnumMap
- Java - SortedMap Interface
- Java - TreeMap
- Java - The IdentityHashMap Class
Java Set Interface
- Java - Set Interface
- Java - HashSet
- Java - EnumSet
- Java - LinkedHashSet
- Java - SortedSet Interface
- Java - TreeSet
Java Data Structures
- Java - Data Structures
- Java - Enumeration
- Java - BitSet Class
- Java - Dictionary
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- Java - Properties
Java Collections Algorithms
Java Miscellaneous
- Java - Recursion
- Java - Regular Expressions
- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
- Java - Array Methods
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
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- Java - Compact Number Formatting
Java APIs & Frameworks
Java Useful Resources
- Java - Set Interface
- Java - HashSet
- Java - EnumSet
- Java - LinkedHashSet
- Java - SortedSet Interface
- Java - TreeSet
Java Data Structures
- Java - Data Structures
- Java - Enumeration
- Java - BitSet Class
- Java - Dictionary
- Java - Hashtable
- Java - Properties
Java Collections Algorithms
Java Miscellaneous
- Java - Recursion
- Java - Regular Expressions
- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
- Java - Array Methods
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
- Java - Record Classes
- Java - Hidden Classes
- Java - Compact Number Formatting
Java APIs & Frameworks
Java Useful Resources
Java Miscellaneous
- Java - Recursion
- Java - Regular Expressions
- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
- Java - Array Methods
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
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- Java - Hidden Classes
- Java - Compact Number Formatting
Java APIs & Frameworks
Java Useful Resources
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
- Java - Record Classes
- Java - Hidden Classes
- Java - Compact Number Formatting
Java APIs & Frameworks
Java Useful Resources
Java - Queue remove() Method
Description
The Java Queue remove() method removes first element of the list. Shifts any subsequent elements to the left (subtracts one from their indices).
Declaration
Following is the declaration for java.util.Queue.remove() method
public E remove(int index)
Parameters
NA
Return Value
This method returns the first element.
Exception
NoSuchElementException − if list is empty.
Example 1
The following example shows the usage of Java Queue remove() method. We're creating a Queue of Integers. We're adding couple of Integers to the Queue object using add() method calls per element. Queue size is printed, queue is printed and using remove() method, first element is removed. Then size and queue is printed again.
package com.tutorialspoint; import java.util.LinkedList; import java.util.Queue; public class QueueDemo { public static void main(String[] args) { // create an empty queue Queue<Integer> queue = new LinkedList<>(); // use add() method to add elements in the queue queue.add(20); queue.add(15); queue.add(30); queue.add(45); System.out.println("Size of list: " + queue.size()); // let us print all the elements available in list again System.out.println("Queue = " + queue); // Removes first element queue.remove(); System.out.println("Now, Size of list: " + queue.size()); // let us print all the elements available in list again System.out.println("Queue = " + queue); } }
Output
Let us compile and run the above program, this will produce the following result −
Size of list: 4 Queue = [20, 15, 30, 45] Now, Size of list: 3 Queue = [15, 30, 45]
Example 2
The following example shows the usage of Java Queue remove(object) method. We're creating a Queue of String. We're adding couple of Strings to the Queue object using add() method calls per element. Queue size is printed, queue is printed and using remove(object) method, an element is removed. Then size and queue is printed again.
package com.tutorialspoint; import java.util.LinkedList; import java.util.Queue; public class QueueDemo { public static void main(String[] args) { // create an empty queue Queue<String> queue = new LinkedList<>(); // use add() method to add elements in the queue queue.add("A"); queue.add("B"); queue.add("C"); queue.add("D"); System.out.println("Size of list: " + queue.size()); // let us print all the elements available in list again System.out.println("Queue = " + queue); // Removes element B queue.remove("B"); System.out.println("Now, Size of list: " + queue.size()); // let us print all the elements available in list again System.out.println("Queue = " + queue); } }
Output
Let us compile and run the above program, this will produce the following result −
Size of list: 4 Queue = [A, B, C, D] Now, Size of list: 3 Queue = [A, C, D]
Example 3
The following example shows the usage of Java Queue remove(index) method. We're creating a Queue of Student objects. We're adding couple of Students to the Queue object using add() method calls per element. Queue size is printed, queue is printed and using remove(index) method, an element is removed. Then size and queue is printed again.
package com.tutorialspoint; import java.util.LinkedList; import java.util.Queue; public class QueueDemo { public static void main(String[] args) { // create an empty queue Queue<Student> queue = new LinkedList<>(); // use add() method to add elements in the queue queue.add(new Student(1, "Julie")); queue.add(new Student(2, "Robert")); queue.add(new Student(3, "Adam")); System.out.println("Size of list: " + queue.size()); // let us print all the elements available in list again System.out.println("Queue = " + queue); // Removes element at 3rd position queue.remove(2); System.out.println("Now, Size of list: " + queue.size()); // let us print all the elements available in list again System.out.println("Queue = " + queue); } } class Student { int rollNo; String name; Student(int rollNo, String name){ this.rollNo = rollNo; this.name = name; } @Override public String toString() { return "[ " + this.rollNo + ", " + this.name + " ]"; } @Override public boolean equals(Object obj) { Student s = (Student)obj; return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name); } }
Output
Let us compile and run the above program, this will produce the following result −
Size of list: 3 Queue = [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]] Now, Size of list: 2 Queue = [[ 1, Julie ], [ 2, Robert ]]