If statment or not an if statement

[crowledg]

So was just wondering am doing the bug gift option and wondering how should i go about it, do i use if statment

import java.util.Scanner;
public class hardwork {

    public static void main(String args[]) {

    	Scanner input = new Scanner (System.in);

    	int giftpoints[]={2000,1200,700,200,1000};
    	String gifts[]={"i-pad","PS3","bike","i-pod","Laptop"};
    	int customerpoints[]={500,1200,300};
    	String names[]={"James","Joe","Danny"};
    	int pin[]={111,222,333};
    	int choices=0;
    	boolean flag=false;
    	int sub=0, userpin=0;
    	String strlogin, strpin, stroption;

    	System.out.print("---- Welcome ----");
    	System.out.println("\n\nPlease choose an option :\n\n1: Login \n2: Exit\n>");
		strlogin=input.next();

		while(!strlogin.matches("[1-2]")) {
			System.out.println("\nError! 1 or 2 only");
			System.out.println("\nPlease choose an option :\n\n1: Login \n2: Exit\n>");
			strlogin=input.next();
				} //End while
choices=Integer.parseInt(strlogin);
//choices is not valid.

    	do {

if (choices == 1) {
System.out.print("\nPlease enter Pin: ");
strpin = input.next();
while(!strpin.matches("\\d+")){
	System.out.println("Incorrect Pin! ");
	System.out.print("\nPlease enter Pin: ");
	strpin = input.next();
}
userpin=Integer.parseInt(strpin);

}//end if choice =1
else{
	System.out.print("\n\n");
System.exit(0);

}//end else to exit

for(int i = 0; i < pin.length; i++) {
if (userpin == pin[i]) {
flag = true;
sub = i;
break;
}
}//end for password

if (flag == false) {
System.out.println("Incorrect pin!");
}//end if flag is false

} while (flag == false);

stroption="";

while(!stroption.equals("4")){


		System.out.println("\nWelcome : " + names[sub]);
    	System.out.println("Points : " + customerpoints[sub]);
    	System.out.println("\n\nPlease choose an option :\n\n1: View Gifts \n2: Buy Gifts\n3: Add Points\n4: Exit\n>");
		stroption=input.next();

		while (!stroption.matches("[1-4]") ) {
			System.out.println("\nError! 1 to 4 only");
			System.out.println("\n\nPlease choose an option :\n\n1: View Gifts \n2: Buy Gifts\n3: Add Points\n4: Exit\n>");
			stroption=input.next();
		}//end while error check
		choices=Integer.parseInt(stroption);

		if(choices ==1){

				System.out.println("\nId \t Gift \t\t Gift Points:");

				for (int i = 0; i < gifts.length; i++) {
					System.out.println(i+1 + "\t" + gifts[i] + "\t\t\t" + giftpoints[i]);


					}//end for

		}//end if


		else if(choices ==2){
			System.out.println("Please enter gift Id");

		}//end else if
		else if(choices ==3){
			System.out.println("How many Points do you want to buy? ");
			int additional_point=input.nextInt();
			customerpoints[sub] = customerpoints[sub]+additional_point;

		}//end else if
		else{
			System.out.print("\n\n");
			System.exit(0);

		}//end else
}//end while stroption =4

    }//end main method


}//end class

[crowledg]

Also do you think i would have been better off declaring the gift ID in an array rather than using the subscript+1 for the ID