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.w3schools;   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.w3schools;   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.w3schools;   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.w3schools;   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.w3schools;   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.w3schools;   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

Example package com.w3schools;   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

We can use descendingMap() method to reverse the map object in java. Syntax: treeMap.descendingMap(); Example package com.w3schools;   import java.util.Map; import java.util.TreeMap;   public class Test { public static void main(String args[]){ //Create TreeMap object. TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();   //Add objects to the TreeMap. treeMap.put(4, "Roxy"); treeMap.put(2, "Sunil"); treeMap.put(5, "Sandy"); treeMap.put(1, … Read more

Example package com.w3schools;   import java.util.Comparator; import java.util.TreeMap;   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; } … Read more