How can I convert a String array into an int array in java?
I am reading a stream of integer characters into a String array from the console, with
BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
for(c=0;c<str.length;c++)
str[c] = br.readLine();
where str[] is String typed.
I want to compare the str[] contents ... which can't be performed on chars (the error)
And hence I want to read int from the console. Is this possible?
Integer.parseInt(String); is something that you want.
Try this:
int[] array = new int[size];
try {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
for (int j = 0; j < array.length ; j++) {
int k = Integer.parseInt(br.readLine());
array[j] = k;
}
}
catch (Exception e) {
e.printStackTrace();
}
Anyways,why don't you use Scanner? It'd be much easier for you if you use Scanner. :)
int[] array = new int[size];
try {
Scanner in = new Scanner(System.in); //Import java.util.Scanner for it
for (int j = 0; j < array.length ; j++) {
int k = in.nextInt();
array[j] = k;
}
}
catch (Exception e) {
e.printStackTrace();
}
int x = Integer.parseInt(String s);
NumberFormatException if the String does not contain a parsable int.Using a scanner is much faster and hence more efficient. Also, it doesn't require you to get into the hassle of using buffered streams for input. Here's its usage:
java.util.Scanner sc = new java.util.Scanner(System.in); // "System.in" is a stream, a String or File object could also be passed as a parameter, to take input from
int n; // take n as input or initialize it statically
int ar[] = new int[n];
for(int a=0;a<ar.length;a++)
ar[a] = sc.nextInt();
// ar[] now contains an array of n integers
Also note that, nextInt() function can throw 3 exceptions as specified here. Don't forget to handle them.
