如何从类中获取变量的值？

Question

So I'm new to java and decided to mess around a little, I wrote a class that converts a string to an array made out of the ascii values of the characters in the string, but I don't know how to get the value of the variable i. I know it's easier to use a list but I'm really curious how to make this work. This is the code:

public class ToAscii {
    static int[] toAscii(String txt){
        int[] array = new int[1000];
        int i = 0;

        char[] ascii1 = txt.toCharArray();

        for(char ch:ascii1){
            array[i] = ch -1;
            i++;
        }

        return array;
    }
}

Answer 1

txt.codePoints().toArray() will convert the String to codepoints (ie numbers of the characters).

For example:

import java.util.Arrays;

public class Main {
    public static void main(final String[] args) {
        System.out.println(Arrays.toString("abc".codePoints().toArray()));
    }
}

will print:

[97, 98, 99]

where 97 corresponds to 'a', 98 to 'b' and 99 to 'c'.

Answer 2

The problem with your code is ch -1 which should be just ch .

You should do it as follows:

import java.util.Arrays;

public class ToAscii {
    public static void main(String[] args) {
        // Test
        System.out.println(Arrays.toString(toAscii("aBc")));
    }
    static int[] toAscii(String txt){
        int[] array = new int[txt.length()];
        int i = 0;

        char[] ascii1 = txt.toCharArray();

        for(char ch:ascii1){
            array[i] = ch;
            i++;
        }
        return array;
    }
}

Output:

[97, 66, 99]

Alternatively , you can do it as follows:

import java.util.Arrays;

public class ToAscii {
    public static void main(String[] args) {
        // Test
        System.out.println(Arrays.toString(toAscii("aBc")));
    }

    static int[] toAscii(String txt) {
        int[] array = new int[txt.length()];
        char[] ascii1 = txt.toCharArray();
        for (int i = 0; i < array.length; i++) {
            array[i] = ascii1[i];
        }
        return array;
    }
}

Output:

[97, 66, 99]