Scanner not able to scan first String

Question

I have the following code

public static void main(String args[]){
    Scanner scanner = new Scanner(System.in);
    int noOfTestCases = scanner.nextInt();
    String[] firstStringsList = new String[noOfTestCases];
    String[] secondStringsList = new String[noOfTestCases];
    for(int i=0;i<noOfTestCases;i++){
        firstStringsList[i] = scanner.nextLine();
        secondStringsList[i] = scanner.nextLine();
    }
    for(int i=0;i<noOfTestCases;i++){
        System.out.println("First String : " + firstStringsList[i]);
        System.out.println("Second String : " + secondStringsList[i]);
    }
}

and the output goes as

1
asd
First String : 
Second String : asd

i.e I first enter 1 which means I have 1 test case which involves getting two String inputs(per test case). But I am able to enter only 1 String which is assigned to the secondStringsList[i]. I am using Intellij IDEA. Why is this happening? Workaround?

Did you search for questions involving `nextLine()` going wrong on a `Scanner`? This exact question gets asked very often. — Dawood ibn Kareem, Feb 14 '14 at 06:22
[Using nextInt() before nextLine()](http://christprogramming.wordpress.com/2014/01/30/java-common-mistakes-1/) — Christian Tapia, Feb 14 '14 at 06:25
Here are two that I prepared earlier! :-) http://stackoverflow.com/questions/20751385/setting-a-scanner-as-a-global-variable http://stackoverflow.com/questions/20181887/java-string-variable-using-next-or-nextline — Dawood ibn Kareem, Feb 14 '14 at 06:25

score 0 · Answer 1 · answered Feb 14 '14 at 07:05

I may have fixed your Issue

public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        int noOfTestCases = scanner.nextInt();
        String[] firstStringsList = new String[noOfTestCases];
        String[] secondStringsList = new String[noOfTestCases];

        scanner.nextLine();


        for (int i = 0; i < noOfTestCases; i++) {
            firstStringsList[i] = scanner.nextLine();
            secondStringsList[i] = scanner.nextLine();
        }
        for (int i = 0; i < noOfTestCases; i++) {
            System.out.println("First String : " + firstStringsList[i]);
            System.out.println("Second String : " + secondStringsList[i]);
        }
    }

Scanner not able to scan first String

1 Answers1