Checks that the String does not contain certain characters. A null String will return true. - Java java.lang

Java examples for java.lang:String Contain

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Description

Checks that the String does not contain certain characters. A null String will return true.

Demo Code

/*//  w w  w  . j a v a2s .  c om
 * Copyright 2013 Guidewire Software, Inc.
 */
/**
 * This class is based, in part, on org.apache.commons.lang.StringUtils and is intended
 * to break the dependency on that project.
 *
 * @author <a href="http://jakarta.apache.org/turbine/">Apache Jakarta Turbine</a>
 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
 * @author Daniel L. Rall
 * @author <a href="mailto:gcoladonato@yahoo.com">Greg Coladonato</a>
 * @author <a href="mailto:ed@apache.org">Ed Korthof</a>
 * @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
 * @author Stephen Colebourne
 * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
 * @author Holger Krauth
 * @author <a href="mailto:alex@purpletech.com">Alexander Day Chaffee</a>
 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
 * @author Arun Mammen Thomas
 * @author Gary Gregory
 * @author Phil Steitz
 * @author Al Chou
 * @author Michael Davey
 * @author Reuben Sivan
 * @author Chris Hyzer
 *  Johnson

 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String str = "java2s.com";
        char[] invalidChars = new char[] { 'b', 'o', 'o', 'k', '2', 's',
                '.', 'c', 'o', 'm', 'a', '1', };
        System.out.println(containsNone(str, invalidChars));
    }

    /**
     * <p>Checks that the String does not contain certain characters.</p>
     *
     * <p>A <code>null</code> String will return <code>true</code>.
     * A <code>null</code> invalid character array will return <code>true</code>.
     * An empty String ("") always returns true.</p>
     *
     * <pre>
     * containsNone(null, *)       = true
     * containsNone(*, null)       = true
     * containsNone("", *)         = true
     * containsNone("ab", '')      = true
     * containsNone("abab", 'xyz') = true
     * containsNone("ab1", 'xyz')  = true
     * containsNone("abz", 'xyz')  = false
     * </pre>
     *
     * @param str  the String to check, may be null
     * @param invalidChars  an array of invalid chars, may be null
     * @return true if it contains none of the invalid chars, or is null
     * @since 2.0
     */
    public static boolean containsNone(String str, char[] invalidChars) {
        if (str == null || invalidChars == null) {
            return true;
        }
        int strSize = str.length();
        int validSize = invalidChars.length;
        for (int i = 0; i < strSize; i++) {
            char ch = str.charAt(i);
            for (int j = 0; j < validSize; j++) {
                if (invalidChars[j] == ch) {
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * <p>Checks that the String does not contain certain characters.</p>
     *
     * <p>A <code>null</code> String will return <code>true</code>.
     * A <code>null</code> invalid character array will return <code>true</code>.
     * An empty String ("") always returns true.</p>
     *
     * <pre>
     * containsNone(null, *)       = true
     * containsNone(*, null)       = true
     * containsNone("", *)         = true
     * containsNone("ab", "")      = true
     * containsNone("abab", "xyz") = true
     * containsNone("ab1", "xyz")  = true
     * containsNone("abz", "xyz")  = false
     * </pre>
     *
     * @param str  the String to check, may be null
     * @param invalidChars  a String of invalid chars, may be null
     * @return true if it contains none of the invalid chars, or is null
     * @since 2.0
     */
    public static boolean containsNone(String str, String invalidChars) {
        if (str == null || invalidChars == null) {
            return true;
        }
        return containsNone(str, invalidChars.toCharArray());
    }

    /**
     * Gets a String's length or <code>0</code> if the String is <code>null</code>.
     *
     * @param str
     *            a String or <code>null</code>
     * @return String length or <code>0</code> if the String is <code>null</code>.
     * @since 2.4
     */
    public static int length(String str) {
        return str == null ? 0 : str.length();
    }
}

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