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Object Oriented Programming Articles
Page 321 of 589
What is the use of Object Cloning in Java?
The article will explain the use of object cloning in Java and provide an appropriate example to clarify the problem. What is the Object Cloning in Java? In Java, object cloning is a way to create an exact copy of an object. We can use the clone() method provided by the Object class to create a clone of an object. When an object is cloned, a new instance of the same class is created, and the fields of the original object are copied to the new object. The Cloneable interface must be implemented by a class whose object is ...
Read MoreHow many ways to call garbage collector (GC) in Java?
This article explains the different ways of calling the garbage collector (GC) in Java. It also includes a brief introduction to garbage collection, various calling approaches, and relevant examples. Garbage Collection (GC) in Java In Java, the garbage collection is carried out by a daemon thread called the Garbage Collector (GC). Instead of waiting until the Java Virtual Machine (JVM) runs a garbage collector, we can request the JVM to run the garbage collector. There is no guarantee that the JVM will accept our request. In Java, we can call the garbage collector (GC) manually in "two ways", which ...
Read MoreHow to convert between List and Array in Java?
In Java, a List is an interface that represents an ordered collection of elements of the same type. You cannot directly create an object of the List interface, instead, you need to instantiate an ArrayList class or another class that implements the List interface.An array is a container that holds a fixed size of similar types of data. As the size is fixed, it can not be changed once created.The conversion between List and array is important because array provides faster access to the elements than List interface (faster in case of searching elements), and provides a fixed size of ...
Read MoreHow to handle the ArithmeticException (unchecked) in Java?
Java ArithmeticException The ArithmeticException of java.lang package is an unchecked exception in Java. It is raised when an attempt is made to use a wrong mathematical expression in the Java program. An example of ArithmeticExeption is division by 0. If you divide two numbers and the number in the denominator is zero. The Java Virtual Machine will throw ArithmeticException. Example: Throwing ArithmeticException In the following Java program, we try a mathematical operation where we divide a number by 0. public class ArithmeticExceptionTest { public static void main(String[] args) { int a ...
Read MorenWhy we should follow the naming conventions in Java?
The Java team and developer community suggest us to follow naming conventions. They are just conventions and are not mandatory but help in writing Java programs that are more understandable and easier to read. For example, class names should generally be nouns, and interface names should be adjectives. Additionally, capitalize the first letter of each separate word. The names used for classes, variables, and methods are called identifiers. Need to Follow Java Naming Conventions Following are the reasons to follow naming conventions: Multiple developers work on the same project simultaneously. Names that follow naming standards reduce ...
Read MoreHow to handle the NumberFormatException (unchecked) in Java?
The NumberFormatException is a class that represents an unchecked exception thrown by parseXXX() methods when they are unable to format (convert) a string into a number. Here, the parseXXX() is a group of Java built-in methods that are used to convert string representations of numbers into their corresponding primitive data types. Causes for NumberFormatException in Java The NumberFormatException extends IllegalArgumentException class of java.lang package. It can be thrown by many methods/constructors of the classes. Following are some of them: int parseInt(String s): It throws NumberFormatException if ...
Read MoreHow to iterate over a list in Java?
In Java if you try to print a List (or any) object directly using the print statement a hash-code of the object will be printed (default behaviour). If you want to print each element of your object (such as List, Array, etc.) or perform any operation on them one by one, you need to iterate through it. Java provides various ways to iterate through objects. Following are different approaches to iterate through a List object: Using For Loop Using While Loop Using Iterator Object Iterate over ...
Read MoreHow to search in a List of Java object?
A List is a sequence of elements of similar data types, and like an array, its elements are stored at specific indices, which can be accessed and searchable through the index (i.e., starting at index 0). We can search through each element in the list and retrieve its index (or position) if it is found in the list. We can search in a List in the following ways - Using indexOf() Method of List Interface Using lastIndexOf() Method Using Comparison Approach Searching in a List using ...
Read MoreHow to iterate a List using for Loop in Java?
To iterate over a List using a for loop, we need to know the size (which can be calculated using the size() method) of the list, so that the loop can execute an accessing element code block till the last position, which is starts from index 0. Once the loop reaches at the last index of the list, it will stop executing and exit. Here are a few examples of how to iterate over a list using a for loop: Iterate a List using For Loop A for-loop is a "control flow statement " which is ...
Read MoreHow to use List size() method in Java With Examples?
In Java, a List is an interface which stores a sequence of elements of similar types. Since the list contains multiple elements, we might need to know how many element the list currently have. To count the total number of elements present in a list, the List interface provides a method named size(). The List size() Method The size() method of List interface is used to retrieve size of the current List. The size refers to total number of items currently the list holds. For example, a list have {1, 2, 3}, then the size of the list will be ...
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