Java Encoding Test Code

Strings.java

package strings;


import java.nio.charset.Charset;
import java.util.Arrays;

/**
 * Created by boileryao on 11/29/2018.
 * Class: Strings
 */
public class Strings {

    static int count(String str, char ch) {
        int cnt = 0;
        for (char c : str.toCharArray()) {
            if (c == ch) {
                cnt++;
            }
        }
        return cnt;
    }

    public static void main(String[] args) {
        String name = "锅炉🐷咦丶恸";
        System.out.println(Arrays.toString(name.toCharArray()));
        System.out.println(name.length());
        for (char c : name.toCharArray()) {
            System.out.println(c + "  " + (int) (c));
        }
        name.codePoints().forEach(System.out::println);

        System.out.println("Default Encoding is " + Charset.defaultCharset().name());
        encodingShow("12");
        encodingShow("{+#$`");
        encodingShow("中国");
        encodingShow("锅炉工🐒");
    }

    private static int[] BIT_MASK = new int[]{
            0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80
    };

    private static void encodingShow(String str) {
        System.out.println("Checking: " + str);
        byte[] bytes = str.getBytes();
        printByteBitArray(bytes);
        printStringWithEncoding(bytes, Charset.forName("ASCII"));
        printStringWithEncoding(bytes, Charset.forName("UTF-8"));
        printStringWithEncoding(bytes, Charset.forName("UTF-16"));
        printStringWithEncoding(bytes, Charset.forName("Unicode"));
        printStringWithEncoding(bytes, Charset.forName("ISO-8859-1"));
    }

    private static void printStringWithEncoding(byte[] bytes, Charset charset) {
        String str = new String(bytes, charset);
        System.out.printf("%10s : %-20s\n", charset.name(), str);
    }

    private static void printByteBitArray(byte[] bytes) {
        for (byte bt : bytes) {
            for (int i = BIT_MASK.length - 1; i >= 0; i--) {
                System.out.print((BIT_MASK[i] & bt) > 0 ? '1' : '0');
            }
            System.out.print(" ");
        }
        System.out.println();
    }
}