Understanding reading String using scanner

Question

I want to read an int, double and string and add each one to a variable but I can't read the string.

int i = 4;
double d = 4.0;
String s = "My name is ";   
Scanner scan = new Scanner(System.in);
int i2 = scan.nextInt();
double d2 = scan.nextDouble();
String s2 = scan.nextLine();        
System.out.println(i+i2);
System.out.println(d+d2);
System.out.println(s + s2);
scan.close();

my understanding is that scan.nextLine() reads a string but it just skips it. scan.next() just reads the first word. it works properly if i added scan.nextLine(); before String str2 = scan.nextLine(); but i dont know why

Take a look at this: http://stackoverflow.com/questions/13102045/scanner-is-skipping-nextline-after-using-next-nextint-or-other-nextfoo — uoyilmaz, Sep 02 '16 at 08:29

Loki · Accepted Answer · 2016-09-02T08:34:44.490

-1

for the input

 2.4
 "Some String"

When you use nextDouble only 2.4 is picked not the EndOfLine (after 2.4 and before "Some String".). Hence your code worked by using 2 nextLine().

You could also use

int i2 = Integer.parseInt(scan.nextLine());
double d2 = Double.parseDouble(scan.nextLine());
String str2 = scan.nextLine();

edited Sep 02 '16 at 08:34

answered Sep 02 '16 at 08:32

Loki

738
3
12

`The method parseInt(String) in the type Integer is not applicable for the arguments (int)` – joc Sep 02 '16 at 08:33
Thanks @joc , edited :) – Loki Sep 02 '16 at 08:35
@Lokesh Agrawal Got it. Thanks. – Steven Sep 02 '16 at 08:40

Understanding reading String using scanner

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