Java String Empty isEmpty(String param)

Description

is Empty

License

Apache License

Declaration

public static boolean isEmpty(String param) 

Method Source Code

//package com.java2s;
/**/*ww w  . ja v a  2 s.  c  o m*/
 * 
 * Copyright 2008 - 2009
 * 
 * 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.
 * 
 * @project loonframework
 * @author chenpeng
 * @email?ceponline@yahoo.com.cn
 * @version 0.1
 */

import java.util.ArrayList;

import java.util.List;

public class Main {

    public static boolean isEmpty(String param) {
        return param == null || param.length() == 0 || param.trim().equals("");
    }

    public static int length(String s) {
        if (s == null)
            return 0;
        else
            return s.getBytes().length;
    }

    public static String[] trim(String[] s) {
        if (s == null) {
            return null;
        }
        for (int i = 0, len = s.length; i < len; i++) {
            s[i] = s[i].trim();
        }
        return s;
    }

    public static String trim(String s, char delimit[]) {
        if (s == null) {
            return null;
        }
        int length = s.length();
        int beginIndex = 0;
        int endIndex = length;
        for (; beginIndex < length; beginIndex++) {
            char c = s.charAt(beginIndex);
            boolean found = false;
            for (int i = 0; i < delimit.length; i++) {
                if (delimit[i] != c) {
                    continue;
                }
                found = true;
                break;
            }
            if (!found)
                break;
        }

        for (; endIndex > beginIndex; endIndex--) {
            char c = s.charAt(endIndex - 1);
            boolean found = false;
            for (int i = 0; i < delimit.length; i++) {
                if (delimit[i] != c)
                    continue;
                found = true;
                break;
            }

            if (!found)
                break;
        }

        if (beginIndex == endIndex)
            return "";
        if (beginIndex > 0 || endIndex < length)
            return s.substring(beginIndex, endIndex);
        else
            return s;
    }

    public static List subString(String in, String open, String end) {
        List list = new ArrayList();
        while (true) {
            int from = in.indexOf(open, 0);
            if (from == -1)
                break;
            in = in.substring(from + open.length(), in.length());
            int to = in.indexOf(open, 0);
            int mid = in.indexOf(open);
            if ((mid > to || mid == -1) && to != -1) {
                list.add(in.substring(0, to));
            }
        }
        return list;

    }
}

Related

1. emptyStringToNull(String value)
2. firstNotEmpty(String... values)
3. getFirstNotEmpty(String str, String sperator)
4. isAnyEmpty(String... sAry)
5. isEmpty(String input)
6. isEmpty(String sTest_)
7. isEmpty(String str)
8. isEmpty(String str)
9. isEmpty(String str)