Java and JDK Many confusing concepts of Java and JDK are discussed in simple terms for a beginner. 1. What is a high-level language? A language is required to communicate with the computer hardware and operating system. A language comprises of instructions known as commands. Commands, earlier at the very beginning are written in binary …
Java Main Features explained one-by-one in Simple words for a Beginner. Java was released to market in 1995 with its first version JDK 1.0. From day one, it is treated as an important language used to develop many applications that are increasing everyday; the latest being Android. As on today, more than 3 billion devices …
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Keyword vs Reserved Java comes with total 53 keywords words that cannot be used in programming. 48 Keywords as on JDk 1.5 release (from JDK 1.5 to 1.8 nothing is added to list). 2 Reserved words of "const" and "goto". 3 Literals of true, false and null. Let us go in detail on Keyword vs …
const vs final In Java, const is a reserved word (other only reserved word is "goto") and is not allowed to be used by Programmer in coding. const is supported by C/C++ and const is replaced by final keyword in Java. Other way, C/C++ const keyword equivalent is final in Java. A final variable cannot …
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Before explaining Java this keyword, first let us see the problem then we will see a solution. Sometimes in coding of any language including Java, local variable may clash with instance (global) variable. That is, both local variable and instance variable are same. If same, an unexpected result occur. Observe the following simple code without …
Java Data Types Meaning Functionality explained. Every programming language comes with data types. As the name indicates, data type is required to store values (data) in a program. Depending on the nature of value to store, suitable data type should be chosen. For example to store a whole number like 10, 20, choose int data …
Let us see the procedure of downloading and installing Java software, JDK, step-by-step. To compile a Java program and to execute a Java program, the software required is JDK (Java Development Kit). It is developed by Sun Microsystems (now owned by Oracle) and the latest version is JDK 1.7. JDK 1.8 is planned to release …
What is Java ? is explained in Simple terms for a Beginner to get an idea of Java. Java, developed by Sun Microsystems and released to market in 1995, is a high-level programming language with many unparalleled features. It can be used to develop standalone applications, web applications (applets and servlets), e-commerce applications, enterprise applications …
In Java, objects are created with "new" keyword. " Java new" allocates memory to the newly created object at runtime. Observe the following on Java new Keyword, then we will go into details. public class Employee { int salary = 5000; public static void main(String args[]) { Employee emp1 = new Employee(); System.out.println(“Employee Salary Rs.”+emp1.salary); …
Every programming language comes with keywords. A keyword is just a word which has got a special meaning and purpose to the compiler. For this reason, we cannot use them in our program to identify our own (to give a name) a class, variable or method. Keywords Java: Some people interchangeably use the two words, …
Backslash Java: Like C/C++, Java also comes with a group of characters treated as a single character and this single character also represents an ASCII value. These characters are known as escape sequences and precede (starts) with a backward slash \ like \n and \t etc. The name is so derived as they escape the …
Java does not support garbage values. An unassigned local variable gives compilation error and an instance (global) variable takes a default value. Following program illustrates the default values given by JVM for unassigned instance variables. String is not a data type. If not assigned, String takes null as the default. public class DataTypeDefaults { byte …
We call C/C++ and Java are strongly typed languages and JavaScript and PERL are loosely typed languages. What does it mean? Either in C or Java, when a variable is declared, it must be informed to the compiler what data type the variable stores like integer, float, double or string etc. Observe the following variable …
A data type informs the compiler what type of data a variable is permitted to store. Data type declaration should be done when the variable is declared. It is required in Java as Java is a strongly typed language. The data type indicates what possible values that can be assigned to variable and possible operations …
Generally, a Java programmer initializes variables in a constructor (or init() method in case of applet). It is the best place chosen, as the constructor is called implicitly when an object is created. Programmer creates objects before anything is done in coding (as object is required to call an instance variable or method). Now read …
Java Naming Conventions Readability Summary: Unlike C/C++, Java comes with naming conventions to increase the readability of code. This "Java Naming Conventions Readability" explains how to do it. After knowing the rules of identifiers, it is the time to know the another grammar of Java known as "conventions". Conventions increase the readability of the program. …
Even though Java is projected as the most demanded language of the times, but has its own disadvantages. Of course, they are very minor in nature and need not be considered as drawbacks compared to the advantages it brings forward. Following is the list of Java Drawbacks a) Slow performance: The first and foremost drawback …
Java is born with some unique and interesting features that made it most powerful and demanded language of the times. Following are the Java Features Buzz Words a) Platform-Independent "Java compiled file known as .class file can be executed on any OS without bothering on which platform (OS) the source code was compiled". That is, …
