Record type a new feature in Java 14.

 The records are new-type declarations in Java 14. It simplifies and reduces boilerplate code that simply acts as "data carrier" i.e. POJO or domain class.POJO or Domain Class:public class Employee { private String name; private Integer age; public Employee(String name, Integer age) { this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }With record type:record Employee (String name, Integer age) {}Record is responsible to generate setters, getters, medhods, constructor, equals(), hashCode() and toString() implicitl...

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Primitive Data Types in Java

Data types are the foundation of a programming language. There are 8 types of primitive in java: boolean, byte, char, double, float, int, long and short. The boolean data type holds value either true or false. The default value of the boolean is false.  The char data type represents a single character 'a', 'B', 'c'. It's 16-bit integer number(un-signed). Un-signed means non-negetive. The others are numeric data types in java (char is included as its number type). They are the following:        Integer Numbers: byte: 1 byte (8 bit) : Stores hole numbers from -128 to 127  char: 2 bytes (16 bit) : Stores hole numbers from 0 to 65535  short: 2 bytes (16 bit) :...

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Sort a Java List with Specific Fields

In this tutorial, we will discuss about sorting a list by specific field/property. Often, we need to sort a list with its specific field. This is very easy and short code in java 8. Let's go for details... Example: 1: package com.javabd1.blogspot.controller; 2: import java.util.ArrayList; 3: import java.util.HashMap; 4: import java.util.List; 5: import java.util.Map; 6: import org.springframework.beans.factory.annotation.Autowired; 7: import org.springframework.stereotype.Controller; 8: import org.springframework.validation.BindingResult; 9: import org.springframework.web.bind.annotation.ModelAttribute; 10: import org.springframework.web.bind.annotation.RequestMapping; 11: import org.springframework.web.bind.annotation.RequestMethod;...

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Methods of Java Class Part-1

In the previous tutorial, discussed five elements of a java class. Method is one of them. Today we will learn about method of java class. As directly writing business logic are not allowed in java class. So we have to write business logic in a method. Method is used to write the logic of the program. Let's go for details of the method. 1. Method Signature : A method signature is the method name and the number and type of its parameters.  Example:-  methodName(parameters); calculate(int...

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Variables Of Java Class part-2

In the previous post, talked about how many elements of a java class & local variable. Now we learn about Instance variable. 2. Instance Variable Declaration:- The variables which are declared inside the class but outside of the method that are called instance variable. Scope:- The variable can access inside the class. All methods, constructors and blocks of the class also able to access the variables. Memory Allocation:- Memory is allocated in object...

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Variables Of Java Class part-1

In the first tutorial, I discussed that, a java class have five elements. Variable is one of these. Now we discuss about variable. There are three types of variables. They are.. Local Variable Declaration:- Declared inside the method or constructor or blocks. Scope:- We can access the local variable only within the method, within the constructor or within the block. Out side is not possible. Memory allocation:- When method or constructor of blocks start memory are allocated. When...

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Basics of Java

Java is a programming language. Based on the concept of Object Oriented Programming(OOP). It is platform independent language (Write Once and Run Anywhere). This technology is used to develop applications for a wide range of environments, from client devices to multifarious enterprise systems. It is class based language. The class contains five elements. These are..  1. Variables  2. Methods 3. Constructors 4. Instance blocks  5. Static blocks Details are coming soon.....

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