The java.util.Collections class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends. Collections.asLifoQueue() method will returns a view of a Deque as a Last-in-first-out (Lifo) Queue. Syntax: … Read more
The java.util.Collections class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends. Collections.addAll() method adds all of the specified elements to the specified collection. Syntax: public boolean … Read more
The java.util.Collections class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends. Java Collections class fields static List EMPTY_LIST: This is the empty list (immutable). static Map … Read more
Collection framework: Collection framework is a unified architecture or a set classes and interfaces for representing and manipulating collections. i.e. collection framework is used to store, retrieve and manipulate collections. Collection framework interview programs: How to Iterate collection objects How to Remove element from collection How to Read all elements in vector How to Copy or … Read more
Example package com.w3spoint; import java.util.LinkedHashMap; class Employee{ private String name; private int salary; private int id; public Employee(int id, String name, int salary){ this.id = id; this.name = name; this.salary = salary; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int … Read more
Example package com.w3spoint; import java.util.LinkedHashMap; class Employee{ private String name; private int salary; private int id; public Employee(int id, String name, int salary){ this.id = id; this.name = name; this.salary = salary; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int … Read more
We can use clear() method to remove all entries from linkedhashmap. clear(): Removes all key-value pairs from this map. Syntax: public void clear() Example package com.w3spoint; import java.util.LinkedHashMap; public class Test { public static void main(String args[]){ LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>(); //Add objects to the HashSet. linkedHashMap.put(4, "Roxy"); linkedHashMap.put(2, … Read more
We can use containsValue() method to search a value in linkedhashmap in java. containsValue(Object v): Returns true if this map contains specified value otherwise returns false. Syntax: public boolean containsValue(Object v) Example package com.w3spoint; import java.util.LinkedHashMap; public class Test { public static void main(String args[]){ LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>(); … Read more
We can use containsKey() method to search a key in treemap in java. containsKey(Object k): Returns true if this map contains specified key otherwise returns false. Syntax: public boolean containsKey(Object k) Example package com.w3spoint; import java.util.LinkedHashMap; public class Test { public static void main(String args[]){ LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>(); … Read more
Example package com.w3spoint; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.Map; import java.util.Set; public class Test { public static void main(String args[]){ LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>(); //Add objects to the HashSet. linkedHashMap.put(4, "Roxy"); linkedHashMap.put(2, "Sunil"); linkedHashMap.put(5, "Sandy"); linkedHashMap.put(1, "Munish"); linkedHashMap.put(3, "Pardeep"); //Print the LinkedHashMap object. System.out.println("LinkedHashMap elements:"); System.out.println(linkedHashMap); //Get … Read more