How to read characters in a string in java

Question

I'm new in java, so sorry if this is an obvious question.

I'm trying to read a string character by character to create tree nodes. for example, input "HJIOADH" And the nodes are HJIOADH

I noticed that

char node = reader.next().charAt(0);  I can get the first char H by this
char node = reader.next().charAt(1);  I can get the second char J by this

Can I use a cycle to get all the characters? like

for i to n
    node = reader.next().charAt(i)

I tried but it doesn't work.

How I am suppose to do that?

Thanks a lot for any help.

Scanner reader = new Scanner(System.in); System.out.println("input your nodes as capital letters without space and '/' at the end"); int i = 0; char node = reader.next().charAt(i); while (node != '/') {

        CreateNode(node); // this is a function to create a tree node
        i++;
        node = reader.next().charAt(i);

    }

Answer 1

You only want to next() your reader once, unless it has a lot of the same toke nrepeated again and again.

String nodes = reader.next();
for(int i = 0; i < nodes.length(); i++) {
    System.out.println(nodes.charAt(i));
}

Answer 2

as Braj mentioned you can try reader.toCharArray() and to then you can easily use the loop

char[] array = reader.toCharArray();
for (char ch : array) {
    System.out.println (ch);
}

Answer 3

For those searching for another solution:

    String anyString = "anystring"
    Scanner sn = new Scanner(anyString);
    sn.useDelimiter("");

    while (sn.hasNext()){
        char c = sn.next().charAt(0);
        System.out.println(c);
        // logic for chars...
    }