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package com.lingyejun.dating.chap11;

import java.nio.charset.StandardCharsets;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class SpecialSpace {

    public static void main(String[] args) {

        String str1 = "lingyejun ";

        byte[] str1Bytes = str1.getBytes();

        String space = new String(str1Bytes, StandardCharsets.UTF_8);

        System.out.println("带有32 Space的字符串:" + space);

        System.out.println("使用trim去掉32 -> Space:" + space.trim());

        byte[] str2Bytes = new byte[11];

        System.arraycopy(str1Bytes, 0, str2Bytes, 0, str1Bytes.length);

        str2Bytes[9] = (byte) 0xC2;

        str2Bytes[10] = (byte) 0xA0;

        String noBreakSpace = new String(str2Bytes, StandardCharsets.UTF_8);

        System.out.println("带有C2 A0 -> NO-BREAK SPACE的字符串:" + noBreakSpace);

        System.out.println("使用trim无法去掉C2 A0 -> NO-BREAK SPACE:" + noBreakSpace.trim());

        // 32为我们平常谈论的Space空格 -> SPACE

        byte[] bytes1 = new byte[]{(byte) 0x20};

        String space1 = new String(bytes1, StandardCharsets.UTF_8);

        System.out.println("UTF-8 字符编码号32 -> 0x1F 输出:" + space1);

        // 0xC2=194 0xA0=160  -> NO-BREAK SPACE

        byte[] bytes2 = new byte[]{(byte) 0xC2, (byte) 0xA0};

        String space2 = new String(bytes2, StandardCharsets.UTF_8);

        char[] chars3 = space2.toCharArray();

        System.out.println("UTF-8 字符编码号194 -> 0xC2 160 -> 0xA0 输出:" + space2);

        byte[] bytes3 = new byte[]{(byte) 0xC2, (byte) 0xA0};

        String c2a0Space = new String(bytes3, StandardCharsets.UTF_8);

        Pattern p = Pattern.compile(c2a0Space);

        Matcher m = null;

        m = p.matcher(noBreakSpace);

        noBreakSpace = m.replaceAll("");

        System.out.println("使用正则去掉C2 A0 -> NO-BREAK SPACE:" + noBreakSpace);

    }

}