Java Statements

•        Statements are similar to sentences in the English language.

•        A Java statement is just an instruction that explains what should happen.

Types of Java Statements

Java supports three different types of statements:

•        Expression statements:    

        change values of variables, call methods, and create objects.

•        Declaration statements :

        To declare variables.

•        Control-flow statements:

            To determine the order that statements are executed. 
1.   Selection statement (if, if else, switch)
2.   Iteration Statement (for, while, do while)
3.   Jump Statement (break, continue, return)

 

Command-line Argument

Meaning:

• A command-line argument is nothing but the information that we pass after typing the name  of the Java program during the program execution. 
• The command requires no arguments. 
• The code illustrates that args length gives us the number of command line arguments. 
• If we neglected to check args length, the command would crash if the user ran it with too few command-line arguments.
• A command-line argument is information that directly follows the program's name 
• on the command line when it is executed. 
• To access the command-line arguments inside a Java program is quite easy. 
• They are stored as strings in the String array passed to main ( ). 

Program: 

class command

{

public static void main(String a[])

{

System.out.println("Welcome to java programming");

}

}

Output:

Welcome to java programming

First Java program:

Let's write our first Java program:

Program:

class command  

{

public static void main(String args[])

{

System.out.println("Welcome to java programming");

}

}

Explanation:

The first we have create a class (as java a general purpose oops language) our program should be within a class and we have created a class named "command".

Next, is our public static void main(String args[]) : the reason we are using this, because our main() method is the execution point of our program.

The "System.out.println" is the standard output statement - where we can use to print the our output.

Output:

Welcome to java programming