1. Command Line Argument in JAVA
public class UseArgument
{
public static void main(String[] args)
{
System.out.print("Hi");
System.out.print(args[0]);
System.out.println("How are you?");
}
}

2. swap two numbers using only two variables in Java
import java.io.*;
class swap
{
public static void main(String[]args) throws IOException
{
int a,b;
DataInputStream din=new DataInputStream(System.in);
System.out.println("Enter the 1st no.(a): ");
a=Integer.parseInt(din.readLine());
System.out.println("Enter the 2nd no.(b): ");
b=Integer.parseInt(din.readLine());
a=a+b;
b=a-b;
a=a-b;
System.out.println("The swaping no. is ");
System.out.println("Enter the 1st no.(a): ");
System.out.println("Enter the 2nd no.(b): ");
}
}

3. Reading data from keyboard by
InputStreamReader and BufferdReader class:
import java.io.*;
class G5{
public static void main(String args[])throws Exception
{
InputStreamReader r=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(r);
System.out.println("Enter your name");
String name=br.readLine();
System.out.println("Welcome "+name);
}
}

4. Java Scanner Example to get input from console
import java.util.Scanner;
class ScannerTest{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.println("Enter your rollno");
int rollno=sc.nextInt();
System.out.println("Enter your name");
String name=sc.next();
System.out.println("Enter your fee");
double fee=sc.nextDouble();
System.out.println("Rollno:"+rollno+" name:"+name+" fe
e:"+fee);
sc.close();
}
}