Android String Char Get 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)