Reading doubles and booleans

Decimal numbers and true-or-false answers are read the same way: read a line, then convert it.

• Double.valueOf(text) turns text like 2.5 or -0.75 into a double.
• Boolean.valueOf(text) gives true when the text is true in any mix of capitals (TRUE, True), and false for anything else.

Scanner scanner = new Scanner(System.in);
double height = Double.valueOf(scanner.nextLine());
boolean ready = Boolean.valueOf(scanner.nextLine());
System.out.println("Height: " + height);
System.out.println("Ready: " + ready);

2
yes

Height: 2.0
Ready: false

Two things in that output are worth a second look:

• The input was 2, but the program prints 2.0. A double is always printed with its decimal part.
• The input was yes, which isn't true, so the boolean is false.