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Programming Articles
Page 1641 of 2547
C++ Program to find the maximum subarray sum O(n^2) time (naive method)
A subarray is a contiguous slice of an array, and maintains the order of elements naturally. (i.e., the elements of the subarray occupy consecutive positions). For example, the subarrays of an array {1, 2, 3} are {1}, {1, 2}, {1, 2, 3}, {2}, {2, 3}, and {3}. Input / Output Scenario Let's see the following input/output scenario: Input: arr[] = {1, 4, 5, 3, -1} Output: 13 Explanation: Subarray {1, 4, 5, 3} has the maximum sum 13. Input: arr[] = {1, 2, -3, 4, 5, -1} Output: 9 Explanation: Subarray {1, 2, -3, 4, 5} has the ...
Read MoreWhat are the differences between import and static import statements in Java?
The import statement is used to bring certain classes and interfaces from other packages into our Java program, so we can access them without using their fully qualified names. We can use the short name instead. Java also supports static import statements, which were introduced in Java 5. It helps in accessing static members such as methods and constants. In this article, we are going to learn the difference between import and static import statements in Java. The import Statement in Java To access a class or method from another package, we need to either use the fully qualified ...
Read MoreWhat are the differences between Widening Casting (Implicit) and Narrowing Casting (Explicit) in Java?
A Type casting in Java is used to convert objects or variables from one data type to another. When we are converting or assigning one data type to another, automatic conversion will take place (if the types are compatible and the conversion is safe). However, if there is a risk of data loss, the conversion must be done explicitly by the programmer. Let's understand the types of Java type casting and the difference between them in this article. Types of Type Casting in Java Java Type Casting is classified into two types, which are: ...
Read MoreHow to resolve a NullPointerException in Java?
The NullPointerException is a subclass of the RuntimeException class. It is defined in java.lang package of Java. In this article, we are going to understand the reasons for NullPointerException and how to resolve them. Reason for NullPointerException in Java A NullPointerException is a runtime exception thrown by the JVM when our application code, another referenced API, or the middleware encounters the following conditions: Attempting to invoke an instance method of a null object. ...
Read MoreDifferences between org.simple.json and org.json libraries in Java?
In Java, org.simple.json and org.json are two libraries that help in reading, writing, and manipulating JSON. But still, they are different. In this article, we are going to learn about these differences. Difference between JSON.simple vs JSON Let's see the below differences and they are - Features JSON.simple JSON ...
Read MoreDifference Between Copy Constructor and Assignment Operator in C++
A copy constructor is a type of constructor that uses another object from the same class that has been created previously, to initialize an object, whereas the assignment operator is used to assign a value to a variable. In this article, we will understand the difference between the copy constructor and the assignment operator in C++. Copy Constructor A copy constructor creates a new object by copying an existing object of the same class which has been created previously. It is of two types, i.e., Default and User-defined copy constructor. In the default copy constructor, ...
Read MoreWhy should I not #include \'bits/stdc++.h\'?
The is a header file that includes all the standard C++ library. It is used during coding contests, as it helps in saving time while solving the problem since programmers do not have to remember all the header files. In the software engineering approach, we should reduce the use of this header file, as it includes lots of files, and sometimes that may not be required in the program. So it may increase the compile time. In this article, we are going to discuss why we should not use the header file ...
Read MoreWhy String literal is stored in String Constant Pool in Java?
In Java, the string literals (or, string objects) are stored in a separate memory area called string constant pool to improve the performance of string operations and optimize the memory while using them. Let's understand how. Creating String Objects in Java There are two ways to create a String object in Java: Using the new operator Using String literal Example The example given below shows how to create a string object: public class Example { public static void main(String[] args) { ...
Read MoreWhen to use @JsonValue annotation using Jackson in Java?
In Java, Jackson is a library that is used to convert JSON to Java objects and vice versa. Jackson Annotations are used during serialization and deserialization. We use these to denote or specify annotations before a particular field or method (that is declared in Java). Using an annotation before a field, we can denote whether it is a variable, is a JsonProperty, should be ignored, or what condition should be applied to it. So basically, Annotations make JSON output clearer as we required. In this Article, we will learn about ...
Read MoreHow to convert a JSON to Java Object using the Jackson library in Java?
Jackson is a Java library that is used to convert JSON to Java objects and vice versa. Conversion of JSON to a Java object is called deserialization, and Java object to JSON is known as serialization. Both of these tasks can be done by using the Jackson library. In this article, we are going to learn how to convert JSON to Java objects using the Jackson library. Jackson Library: Convert a JSON to a Java Object The ObjectMapper class belongs to the Jackson library. This class is responsible for the serialization and deserialization of Java objects. The ObjectMapper class is used ...
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