Java String Starts Wtih startsWith(final String s, final String prefix, final boolean ignoreCase)

Description

Check if a String starts with a specified prefix (optionally case insensitive).

License

Open Source License

Declaration

private static boolean startsWith(final String s, final String prefix, final boolean ignoreCase) 

Method Source Code

//package com.java2s;
/**// w  w w.j  a  va  2s .  c o  m
 * Copyright Sangram Jadhav. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * <p>
     * Check if a String starts with a specified prefix.
     * </p>
     *
     * <p>
     * {@code null}s are handled without exceptions. Two {@code null} references
     * are considered to be equal. The comparison is case sensitive.
     * </p>
     *
     * @param s
     *            the String to check, may be null
     * @param prefix
     *            the prefix to find, may be null
     * @return {@code true} if the String starts with the prefix, case
     *         sensitive, or both {@code null}
     */
    public static boolean startsWith(final String s, final String prefix) {
        return startsWith(s, prefix, false);
    }

    /**
     * <p>
     * Check if a String starts with a specified prefix (optionally case
     * insensitive).
     * </p>
     *
     */
    private static boolean startsWith(final String s, final String prefix, final boolean ignoreCase) {
        if (s == null || prefix == null) {
            return s == null && prefix == null;
        }
        if (prefix.length() > s.length()) {
            return false;
        }
        return s.toString().regionMatches(ignoreCase, 0, prefix.toString(), 0, prefix.length());
    }
}

Related

1. startsWith(final CharSequence str, final CharSequence prefix)
2. startsWith(final CharSequence target, final CharSequence prefix)
3. startsWith(final E[] array, final E[] prefix)
4. startsWith(final Object[] left, final Object[] right, final boolean equals)
5. startsWith(final String fullMethodName, final String prefix)
6. startsWith(final String s, final String[] prefixes)
7. startsWith(final String searchString, final String crit)
8. startsWith(final String source, final String prefix)
9. startsWith(final String src, final String sub)