JAVA

how to convert string array to int in java

int[] numbers = Arrays.stream(line.split(",")).mapToInt(Integer::parseInt).toArray();

string to int array

String s = "1234";
int[] intArray = new int[s.length()];

for (int i = 0; i < s.length(); i++) {
	intArray[i] = Character.digit(s.charAt(i), 10);
}

Converting String Array to an Integer Array

int[] arr = Stream.of(new String[]{"1", "2", "3"})
                  .mapToInt(Integer::parseInt).toArray();
System.out.println(Arrays.toString(arr));

String to Int Array

For the values of the array given by separated with space " " you can try this cool one liner Java 8 & onwards suppported streams based solution:

Scanner scan = new Scanner(System.in);
double[] arr = Arrays.stream(scan.nextLine()
                                  .trim()
                                  .split(" "))
                                  .filter(x -> !x.equals(""))
                                  .mapToDouble(Double::parseDouble)
                                  .toArray();
                                  
For int array you can try:

 Scanner scan = new Scanner(System.in);
 int[] arr = Arrays.stream(scan.nextLine()
                                  .trim()
                                  .split(" "))
                                  .filter(x -> !x.equals(""))
                                  .mapToInt(Integer::parseInt)
                                  .toArray();
                                  
With filter() method you can also avoid more than one spaces in between the inputs.

convert string to int array

char c = '2';
int asInt = c - '0';
//asInt = 2