Java Java String Unescape unescapeJava(final String str)

Description

unescape Java

License

Open Source License

Declaration

public static String unescapeJava(final String str) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static String unescapeJava(final String str) {
        final char[] chars = str.toCharArray();
        final StringBuilder sb = new StringBuilder(str.length());
        for (int i = 0; i < chars.length; ++i) {
            char c = chars[i];
            if (c != '\\') {
                sb.append(c);/*w  ww  .j ava  2  s.  co m*/
            } else {
                ++i;
                c = chars[i];
                switch (c) {
                case 'b': {
                    sb.append('\b');
                    break;
                }
                case 't': {
                    sb.append('\t');
                    break;
                }
                case 'n': {
                    sb.append('\n');
                    break;
                }
                case 'f': {
                    sb.append('\f');
                    break;
                }
                case 'r': {
                    sb.append('\r');
                    break;
                }
                case '\"': {
                    sb.append('\"');
                    break;
                }
                case '\\': {
                    sb.append('\\');
                    break;
                }
                case 'u': {
                    final char hex = (char) Integer.parseInt(new String(chars, i + 1, 4), 16);
                    sb.append(hex);
                    i += 4;
                    break;
                }
                default: {
                    throw new IllegalArgumentException("Invalid escaping character: " + c);
                }
                }
            }
        }
        return sb.toString();
    }

    public static String toString(final Object value) {
        if (value == null) {
            return null;
        }
        return value.toString();
    }
}

Related

1. unescapeJava(final String s)
2. unescapeJava(final String str)
3. unescapeJava(String escaped)
4. unescapeJava(String s)
5. unescapeJava(String str)