CODEWITHSUNDEEP
javaarraylistinputjava.util.scanneruser-input
Warrior990
Warrior990

Reputation: 69

Using ArrayList for user input

I want to allow the user to input strings until a blank line is entered, and have the strings stored in an ArrayList. I have the following code and I think it's right, but obviously not.

String str = " "; 
Scanner sc = new Scanner(System.in);
ArrayList<String> list = new ArrayList<String>();     
System.out.println("Please enter words");
while (sc.hasNextLine() && !(str = sc.nextLine()).equals("")) {
    list.add(sc.nextLine());
} 

for(int i=0; i<list.size(); i++) {
    System.out.println(list.get(i));
}

Upvotes: 0

Views: 153

Answers (1)

davidxxx
davidxxx

Reputation: 131526

You consume the next line one time more as you can as you invoke a single time sc.hasNextLine() but twice sc.nextLine().
Instead, invoke a single time nextLine() and then use the variable where you stored the result to retrieve the read line :

while (sc.hasNextLine() && !(str = sc.nextLine()).equals("")) {
    list.add(str);
}

Upvotes: 2

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