Question

In Java, is there a premade method that I can use to take some selected indices of an array of chars, stick the terms defined by those indices together and return it as a string? The reason I’m looking for a method here is that I would like to avoid having to create another array to hold my selected values. What I’m looking for is something that looks like this:

public String charArrayToString(char[] array, int startingIndex, int lastIndex) {
        // ignore any index that is outside of the startingIndex - lastIndex range
        // turn array[startingIndex], array[startingIndex + 1] ... array[lastIndex] into a string
}

Answer 1

I would use the constructor

public String charArrayToString(char[] array, int startingIndex, int lastIndex) {
    return new String(array, startIndex, lastIndex - startIndex + 1);
}

Depending on what you are doing with the result, a better solution might be to use StringBuilder.append

char[] coords = "000175001022".toCharArray();

StringBuilder sb = new StringBuilder();
sb.append("( ");
sb.append(coords, 0, 6);
sb.append(", ");
sb.append(coords, 6, 6);
sb.append(" )");
System.out.println(sb); // prints ( 000175, 001022 )