Android String Char Get charSubString(String str, int charLen)

Here you can find the source of charSubString(String str, int charLen)

Description

char Sub String

License

Apache License

Declaration

public static String charSubString(String str, int charLen) 

Method Source Code

//package com.java2s;
/*//from  w w  w.  ja v  a 2 s.  co  m
 * Copyright 1999-2101 Alibaba Group.
 *
 * 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.
 */

import java.io.UnsupportedEncodingException;

public class Main {
    public static final String CHARSET_NAME_UTF8 = "UTF-8";

    public static String charSubString(String str, int charLen) {
        StringBuffer sb = new StringBuffer();
        int counter = 0;
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            sb.append(c);
            if (c < 255) {
                counter++;
            } else {
                counter = counter + 2;
            }
            if (counter > charLen) {
                if (i < str.length() - 1) {
                    sb.delete(sb.length() - 1, sb.length());
                }
                break;
            } else if (counter == charLen) {
                break;
            }
        }
        return sb.toString();
    }

    public static String toString(final byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        try {
            return new String(bytes, CHARSET_NAME_UTF8);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public static String toString(final byte[] bytes, String charset) {
        if (bytes == null) {
            return null;
        }
        try {
            return new String(bytes, charset);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
}

Related

  1. charAt(String str, int index)
  2. getCharLength(String str)
  3. getCharNum(String str, char ch)
  4. getFirstChar(String ch)
  5. isValidChar(String strInput)