what is the use of char type=in.nextLine().toUpperCase().toUpperCaseArray( )[0]; ?

[Aivy]

need your help please...
what is the use of char type=in.nextLine().toUpperCase().toUpperCaseArray( )[0]; in this program?

import java.util.Scanner;
public class weight1 {
public static void main(String[] args){
Scanner in = new Scanner(System.in);
System.out.println("Enter pounds or ounce as your original unit of weight (P/O): ");
char type = in.nextLine().toUpperCase().toCharArray()[0];
System.out.println("Enter your weight: ");
double weight = in.nextDouble();
switch(type){
case 'P':
System.out.println(weight + " pounds is " + (weight * 0.453592) + " in kilograms and " + ( weight * 453.59232)+ " in grams. ");
break;
case 'O':
System.out.println(weight + " ounce is " + (weight  * 0.02835) + " in kilograms and " + ( weight * 28.34952) +  " in grams. ");
break;
}
}
}

[Norm]

Separate the compound statement into separate single statements if you have a hard time seeing what that statement is doing.

[JosAH]

That code is a bit silly for a couple of reasons:

1) if the input line was empty the size of the array will be zero and an ArrayOutOfBoundsException will be thrown;
2) there is no need to convert an entire String to an array and fetch the first char from it; it could've been fetched from the String direcly.

kind regards,

Jos