Java Syntax

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Syntax

class ClassName
{
    public static void main(String args[])
    {
        System.out.println("Welcome");
    }
}

In the above syntax
class: is a keyword.
ClassName: ClassName any uder defined name.
public static void main(): It is a main method or function.
Here
public:public is a accessmodifier.
public means It runs anywhere(any Platform , any Processor)
static: Here static is a one time memory allocation
void: is a no return type.
String args[]: It is a String array.It is used to store the keyboard values.
System.out.println.: It is a output statement.
Here
System: is a Class.
out: This is an instance of PrintStream type, which is a public and static member field of the System class.
println: is a method.

Here:
These output statements are classified into 2 types.
1.print
2.println

print:

It is used to print the statements in a single line.

println:

It is used to print the statements in a line by line.

Steps to write a java program in Notepad

Step 1:
Open Notepad write the java program.

Step 2:
Save the Program with ClassName.java in any location

Step 3:
Path Setting:
1. Open MyComputer(This PC) open
C:Drive open
ProgramFile open
java open
jdk open
bin open
and copy bin URL:

2: Right click on MyComputer(This PC)
Properties
Advanced System Settings
Environment Variables
User Variables
Take a New Option
Varaible Name: path
Variable Value: Paste copied bin Path
Click On Ok
Ok Ok

Step 4:
Open Command Prompt and change the directory where the Java Program saved
Syntax:
cd foldername

Step 5: Compile the java program with the special syntax is
Syntax:
javac programname.java

Here javac is a compiler which is used to compile the java program and display the error in the program
If there is no error in the program it genarates.class file.

Step 5:
Run the java program
Syntax:
java programname.

Steps to write a java program in Eclipse

Step 1: open Eclipse
Step 2: Goto file menu - new - other - search java project and click on next
Step 3: Project Name: Some name...
click on next
click on finish
Step 4: click on project in the project explorer
go to src
right click on src
new
class
classname: somename
select public static void main and click on finish
Step 5: Write a java program in main method
Step 6: Save java program (press ctrl+s)
Step 7: Run java program:
Right click on your java program
Run as
java Application
Step 8: output will be displayed in the console
Next Topic: Java Operators

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