Category: java
Why should we prevent Method Overriding in Java
In the previous article we discussed, how to prevent method overriding in Java. In this article we will discuss what’s the need of Preventing method overriding in Java. Need of preventing Method Overriding in Java We generally prevent method overriding in Base class because of two reasons i.e. Advertisements Design Decision Performance Lets discuss both …
Overriding a method with different return type in Java
In this article we will discuss how to override a method in Java with different return type. The basic rule for overriding a method in Java is that the new overriding method in derived class should have same signature as of Base class’s method. But there is on exception to this rule i.e. Advertisements Overriding method …
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How to Prevent Method Overriding in Java
In this artcile we will discuss how to prevent method overriding in Java. By preventing method overriding in Base class, we means that any class that extends this Base class will not able to override these methods. Need of preventing method overriding is dicussed in next article. Advertisements Preventing Method Overriding in Java Method overriding …
Passing Variable Arguments to a function in Java using varargs – Tutorial & Example
In this article we will discuss how to pass variable number of arguments of a type in a function in java using varargs. Passing Variable Arguments to a function Let’s write a function that accepts variable number of same type for example int in this case i.e. Advertisements Calling function with 2 arguments i.e. two …
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How to pass an ArrayList to varargs method
In this article we will see how to pass an arraylist to a method expecting vararg as an method argument. Suppose we have a method that accepts varargs of type Integer and calculates the sum of them i.e. Advertisements int calculateSum(Integer… nums) { int sum = 0; for(int num : nums) { sum = sum + …
Java : Creating HashMap by associating multiple values with same Key
In this article we will discuss how to create a HashMap with multiple values associated with same Key in Java. Suppose we want to create a HashMap to keep the track of strings and their occurrences in text. For example. Advertisements “the” occurred at following indexes 1,4,8,12. “at” occurred at following indexes 22, 28, 44 …
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Java : How to Remove elements from HashMap while Iterating
In this article we will discuss different ways to remove elements from HashMap while Iterating. Let’s create a HashMap of String as Key and Integer as value and add some elements into it i.e. Advertisements // Create a HashMap of string and int HashMap<String, Integer> wordFreqMap = new HashMap<>(); // Add elements in Map wordFreqMap.put(“this”, …
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Java : How to update the value of an existing key in HashMap | put() vs replace()
In this article we will discuss different ways to update the value of an existing key in HashMap in Java. Suppose we have a HashMap of words and their frequency count i.e. Advertisements // Create a Map of words and their frequency count HashMap<String, Integer> mapOfWords = new HashMap<String, Integer>() { { put(“John”, 25); put(“at”, …
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Java: How to get all keys by a value in HashMap ? | Search by Value in Map
In this article we will discuss how to search into a Map by value and fetch associated keys to the given value. Suppose we have a map of string and integers i.e. Advertisements HashMap<String, Integer> mapOfWords = new HashMap<String, Integer>() { { put(“John”, 25); put(“at”, 2); put(“from”, 10); put(“is”, 5); put(“the”, 2); put(“hello”, 1); put(“break”, …
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