Java Programing laungage

Core Java Tutorial

Introduction of Core Java

How To Install JDk and Set of Path

Syntax of java Program

Difference between Java and C/C++

Advantage and Disadvantage of Java

What is Java

Why Java is not Pure Object Oriented Language

Java has Following Features/Characteristics

Limitation of Java Language and Java Internet

Common Misconception about Java

Simple Program of Java

Integrated Development Environment in java

Compile and Run Java Program

Applet and Comments in Java

Tokens in Java

Keywords in Java

Identifier and Variables in Java

Literals/Constants

Data Type in Java

Assignments and Initialization in Java

Operators in Java

Rule of Precedence in Java

Operator on Integer and Separators in Java Programming

Java Control Flow of Statements

If and If-else Selection Statement

Nested If-else and If-else-If Selection Statement

switch case and conditional operator Selection Statement

for and while Loop

do..while and for each Loop

break and labeled break statement

continue and labeled continue statement

return Statement and exit() Method

Escape Sequence for Special Characters and Unicode Code

Constants and Block or Scope

Statement in Java

Conversions between Numeric Types in Java

Import Statement in Java

User Input in Java using Scanner Class

User Input in Java using Console Class

Array in Java

One Dimensional Array

Two Dimensional Array

Two Dimensional Array Program

Command Line Argument in Java

String args Types in Java

Uneven/Jagged array in java

Math Class Function and Constant

Math Class all Function used in a program

Enumerated Types in Java

Object Oriented Programming v/s Procedural Programming

Object Oriented Programming Concepts in Java

Introduction to Class,Object and Method in Java

Class Declaration in Java

Class & Objects in java

Encapsulation in Java

Modifiers/Visibility for a Class or Interrface or member of a Class

Polymorphism in Java

Runtime polymorphism (dynamic binding or method overriding)

Command Line Argument in Java
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Sometimes we will want to pass information into a program when we run it. The arguments passed from the console can be received in the java program and it can be used as an input. This is accomplished by passing command-line argument to main(). A command line argument is the information that directly follows the program's name n the command line which it is executed. To access the command-line argument inside a java program we have to use string array passed to main().

The JVM calss the main() method and passes the command line argument to it as an array of string. The length of the array(i.e the number of the command line arguments) is obtained using attribute length.

All java applications contain a static method named main(). It takes one argument that is an array of String objects. These objects represent any arguments that may have been entered by the user on the command line. The number of command line arguments is obtained by the expression args.length. It is of type int. We can access individual arguments by args[0], args[1] and so on...

Example :

class Hello
{
	public static void main(String args[])
	{
		for(int i=0;i<args.length;i++)
		{
			System.out.println("Hello"+args[i]);
		}
	}
}

output :

 

Converting String to int

A Numeric string can be converted into an integer using the parseInt method in the Integer class.The parseInt method is invoked as follows:

Integer.parseInt( NumericString );

The parseInt method returns an integer value of the numeric string.

Example :

class Sum
{
	public static void main(String args[])
	{
		int sum=0;
		for(int i=0;i<args.length;i++)
		{
			sum+=Integer.parseInt(args[i]);
			
		}
		System.out.printf("sum is %d",sum);
	}
}
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