What is Java? Tutorial
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, …
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 …
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 …
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, …
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 …
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. …
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 …
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 …
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 …
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); …
An identifier in Java can denote a variable or method or class name or package or an interface. An identifier allows the Programmer to refer the value from a different part of the program. For example, int magoes = 10; Whenever, 10 is required in the code, the programmer can use the identifier mangoes. Java …
