Why there is no scanner.nextline() method between two nextInt() methods-CodePudding

Scanner scanner = new Scanner(System.in);
System.out.println("Enter first number");
int FirstNumber = scanner.nextInt();
System.out.println("Entered First Number is"   FirstNumber);
System.out.println("Enter Second Number");
int SecondNumber = scanner.nextInt();
System.out.println("Entered Second Number is"   SecondNumber);

There is no error in the mentioned code everything is perfect but I have a doubt about why we didn't write a scanner.next line() method to handle enter key being pressed after the first number is entered on the console.

CodePudding user response：

Scanner.nextInt() does not read new lines, it only progresses in the current line. See: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#nextInt()

CodePudding user response：

nextInt reads the next token in the scanner.

According to the documentation

A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace.

And further down

The default whitespace delimiter used by a scanner is as recognized by Character.isWhitespace().

The documentation for Character.isWhitespace() says that it returns true if the given codepoint

[...] [...] is '\n', U 000A LINE FEED. [...]

Which means that \n is a separator, thus it's not part of any token, so you don't need to skip it with a dummy call to nextLine()