Unable to print array after taking user input

Question

I'm missing something in accepting input from keyboard and store it in array.

This is what I tried:

    public static void main(String[] args) {
        System.out.println("Hello World");

        Scanner obj=new Scanner(System.in);
        System.out.println("enter sentence ");
        String[] inputArray = new String[10];
        int i = 0;
        while (obj.hasNext()){
           String word = (String) obj.next();
           inputArray[i] = word;
           System.out.println("word is  " + word);
           System.out.println("array is  " + inputArray[i]);

        }
        System.out.println("final array is  " + inputArray); //This line doesn't print. Why ?
     }

Why I can't print the array after while loop?

Scary Wombat · Accepted Answer · 2020-01-16T00:25:33.580

3

That is because you are already incrementing i

change to

String word = (String) obj.next();
inputArray[i] = word;
System.out.println("word is  " + word);
System.out.println("array is  " + inputArray[i]);
// now increment
i++;

The reason that the last line is not printing is that the obj.hasNext is blocking waiting for input, you need somehow to break, also see java Scanner.hasNext() usage

edited Jan 16 '20 at 00:25

answered Jan 15 '20 at 23:59

Scary Wombat

44,617
6
35
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that so stupid. Thank but I'm stuck at one more thing. Can you tell me why the last print statement after while loop isnt executing? – Teja Nandamuri Jan 16 '20 at 00:01
2

the `obj.hasNext` is blocking waiting for input, you need somehow to break, also see https://stackoverflow.com/a/42130999/2310289 and https://stackoverflow.com/questions/42381990/breaking-out-of-scanner-hasnext-loop – Scary Wombat Jan 16 '20 at 00:13
please add the link to your answer. I'll accept it. Thanks for your time. :) – Teja Nandamuri Jan 16 '20 at 00:16

score 0 · Answer 2 · answered Jan 16 '20 at 00:04

0

You can use a for cycle.

would be something like:

for(int I; i<inputArray.length;i ++){
System.out.println("word is  " + word);
System.out.println("array is  " + inputArray[i]);

}

answered Jan 16 '20 at 00:04

Pythus99

3
2

score 0 · Answer 3 · answered Jan 16 '20 at 00:32

variable "i" is being incremented at wrong place so System.out.println("array is " + inputArray[I]) doesn't print any value.

Statement System.out.println("final array is " + inputArray) is not reached because while loop is never exited. Please see below code, I exited while loop after 10 entries and it would print the final array.

    public static void main(String[] args) {
        System.out.println("Hello World");

        Scanner obj=new Scanner(System.in);
        System.out.println("enter sentence ");
        String[] inputArray = new String[10];
        int i = 0;
        while (obj.hasNext()){
            if(i >= 10){
                break;
            }
            String word = (String) obj.next();
            inputArray[i] = word;
            System.out.println("word is  " + word);
            System.out.println("array is  " + inputArray[i]);
            i++; //pls ignore this dumb error

        }
        System.out.println("final array is  " + inputArray); //This line doesn't print. Why ?
        Arrays.stream(inputArray).forEach(System.out::println);
    }

Unable to print array after taking user input

3 Answers3