Small Programs

Hello World

public class HelloWorld{   public static void main(String args[]){     System.out.println("Hello World");   } }

c:\>java HelloWorld Hello World

Command Line Arguments

public class CmdArgs{   public static void main(String args[]){     System.out.println("The first argument is " + args[0]);   } }

c:\>java CmdArgs Hello Hello

Usage of If-else

public class ExIf{   public static void main(String args[]){     if(args[0].equals("args")){       System.out.println("You entered args");     }     else{       System.out.println("You did not enter args");     }   } }

c:\>java ExIf args You entered args

Usage of For loop

public class ExFor{   public static void main(String args[]){     for(int i=1;i<=args.length;i++){       System.out.println("The " + i + "th argument is " + args[i-1]);     }   } }

c:\>java ExFor One Two Three The 1th argument is One The 2th argument is Two The 3th argument is Three

Usage of while loop

public class ExWhile{   public static void main(String args[]){     int i=1;     while(i<=args.length){       System.out.println("The " + i + "th argument is " + args[i-1]);       i++;     }   } }

c:\>java ExWhile One Two Three The 1th argument is One The 2th argument is Two The 3th argument is Three