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JavaInterviewPoint

Java Development Tutorials

Override toString() method of ArrayList in Java

October 5, 2015 by javainterviewpoint Leave a Comment

When we are working with ArrayList of Objects then it is must that we have to override toString() method of Java ArrayList to get the output in the desired format. Lets learn how to override toString() method. … [Read more...]

Find Common Elements between two ArrayList in Java

October 2, 2015 by javainterviewpoint Leave a Comment

In this tutorial we will learn how to get the common elements between two ArrayList. We would be using removeAll() method to retain only the common elements between two lists. public boolean removeAll(Collection<?> c) It removes all the elements in the list that are not contained in the specified list. … [Read more...]

Java TreeMap values() Method Example

September 21, 2015 by javainterviewpoint Leave a Comment

The values() method of java.util.TreeMap class returns a Collection view of the values contained in this map. The collection's iterator returns the values in ascending order of the corresponding keys. … [Read more...]

Java TreeMap floorKey() Method Example

June 5, 2015 by javainterviewpoint Leave a Comment

The  floorEntry() method of java.util.TreeMap class returns a key-value mapping associated with the greatest key less than or equal to the given key, or null if there is no such key. whereas floorKey() method returns the greatest key less than or equal to the given key, or null if there is no such key. … [Read more...]

Java TreeMap ceilingEntry(K key) Example

March 28, 2015 by javainterviewpoint Leave a Comment

The ceilingEntry(K key) method of java.util.TreeMap class returns a key-value mapping associated with the least key greater than or equal to the given key, or null if there is no such key. … [Read more...]

Java HashMap putAll(Map m) Example

March 20, 2015 by javainterviewpoint Leave a Comment

The put(K key, V value) method of java.util.HashMap class associates the specified value with the specified key in this map. If the map previously contained a mapping for the key, the old value is replaced whereas putAll(Map<? extends K,? extends V> m) method copies all of the mappings from the specified map to this map. These mappings will replace any mappings that this … [Read more...]

Java HashMap entrySet() Example

March 15, 2015 by javainterviewpoint Leave a Comment

The entrySet() method of java.util.HashMap class returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. … [Read more...]

Java HashMap containsValue(Object value) Example

March 14, 2015 by javainterviewpoint Leave a Comment

The containsKey(Object key) method of java.util.HashMap class returns true if this map contains a mapping for the specified key where as containsValue(Object value) method returns true if this map maps one or more keys to the specified value. … [Read more...]

Java TreeSet descendingSet() Method Example

March 10, 2015 by javainterviewpoint Leave a Comment

The descendingIterator() method of java.util.TreeSet class will return an iterator over the elements in this set in descending order whereas descendingSet() method returns a reverse order view of the elements contained in this set. The descending set is backed by this set, so changes to the set are reflected in the descending set, and vice-versa. If either set is modified while … [Read more...]

Java Vector toString() Example

March 9, 2015 by javainterviewpoint Leave a Comment

The toString() method of java.util.Vector class returns a string representation of the Vector, containing the String representation of each element. … [Read more...]

Java Vector size() Example

March 6, 2015 by javainterviewpoint Leave a Comment

The size() method of java.util.Vector class will return us the actual size of the vector(Count of number of elements present in the vector). … [Read more...]

Java LinkedHashSet add(E e) Method Example

March 2, 2015 by javainterviewpoint Leave a Comment

In this tutorial we will learn about add(E e) method of java.util.LinkedHashSet class. This method inserts the specified element to the end of the LinkedHashSet … [Read more...]

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Java Basics

  • JVM Architecture
  • Object in Java
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  • How to Set Classpath for Java in Windows
  • Components of JDK
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  • Use of Class.forName in java
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Oops Concepts

  • Inheritance in Java
  • Types of Inheritance in Java
  • Single Inheritance in Java
  • Multiple Inheritance in Java
  • Multilevel Inheritance in Java
  • Hierarchical Inheritance in Java
  • Hybrid Inheritance in Java
  • Polymorphism in Java – Method Overloading and Overriding
  • Types of Polymorphism in java
  • Method Overriding in Java
  • Can we Overload static methods in Java
  • Can we Override static methods in Java
  • Java Constructor Overloading
  • Java Method Overloading Example
  • Encapsulation in Java with Example
  • Constructor in Java
  • Constructor in an Interface?
  • Parameterized Constructor in Java
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  • What is the use of a Private Constructors in Java
  • Interface in Java
  • What is Marker Interface
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Java Keywords

  • Java this keyword
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  • Final Keyword in Java
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Miscellaneous

  • newInstance() method
  • How does Hashmap works internally in Java
  • Java Ternary operator
  • How System.out.println() really work?
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  • Serialization and Deserialization in Java with Example
  • Generate SerialVersionUID in Java
  • How to make a class Immutable in Java
  • Differences betwen HashMap and Hashtable
  • Difference between Enumeration and Iterator ?
  • Difference between fail-fast and fail-safe Iterator
  • Difference Between Interface and Abstract Class in Java
  • Difference between equals() and ==
  • Sort Objects in a ArrayList using Java Comparable Interface
  • Sort Objects in a ArrayList using Java Comparator

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