Returns a quoted version of a given string, i.e. - Java java.lang

Java examples for java.lang:String Quote

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Description

Returns a quoted version of a given string, i.e.

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String s = "java2s.com";
        System.out.println(quote(s));
    }/*from   ww w . j  ava2s .  c  o m*/

    /**
     * Returns a quoted version of a given string, i.e. as a Java String
     * Literal.
     * 
     * @param s
     *            [nullable] the string to quote
     * @param nullResult
     *            [default="null"] the String to be returned for null values.
     * @return the nullResult when s is null, otherwise s as a quoted string
     *         (i.e. Java String Literal)
     * 
     */
    public static String quote(String s, String nullResult) {
        if (s == null) {
            return nullResult;
        }
        StringBuffer result = new StringBuffer();
        result.append('"');
        int length = s.length();
        for (int i = 0; i < length; i++) {
            char c = s.charAt(i);
            switch (c) {
            case '\b': {
                result.append("\\b");
                break;
            }
            case '\f': {
                result.append("\\f");
                break;
            }
            case '\n': {
                result.append("\\n");
                break;
            }
            case '\r': {
                result.append("\\r");
                break;
            }
            case '\t': {
                result.append("\\t");
                break;
            }
            case '\\': {
                result.append("\\\\");
                break;
            }
            case '"': {
                result.append("\\\"");
                break;
            }
            default: {
                if (c < ' ' || c >= '\u0080') {
                    String n = Integer.toHexString(c);
                    result.append("\\u");
                    result.append("0000".substring(n.length()));
                    result.append(n);
                } else {
                    result.append(c);
                }
            }
            }
        }
        result.append('"');
        return result.toString();
    }

    /**
     * see {@link #quote(String, String)}
     * 
     * @param s the string to quote
     * @return nullable
     */
    public static String quote(String s) {
        return quote(s, "null");
    }
}

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