Android String Repeat repeat(String str, int repeat)

Description

repeat

License

Apache License

Declaration

public static String repeat(String str, int repeat) 

Method Source Code

//package com.java2s;
/**//from   www  . ja  va2 s  .  c o  m
 * Copyright 2013 ??????
 *
 * 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 {
    public static final String EMPTY = "";

    public static String repeat(String str, int repeat) {
        if (str == null) {
            return null;
        }
        if (repeat < 1) {
            return EMPTY;
        }
        int inputLen = str.length();
        if (inputLen == 0 || repeat == 1) {
            return str;
        }
        int outputLen = inputLen * repeat;
        if (inputLen == 1) {
            char ch = str.charAt(0);
            char[] output = new char[outputLen];
            for (int i = 0; i < outputLen; i++) {
                output[i] = ch;
            }
            return new String(output);
        } else {
            StringBuilder output = new StringBuilder((int) Math.min(
                    (outputLen * 110L) / 100, Integer.MAX_VALUE));
            for (int i = 0; i < repeat; i++) {
                output.append(str);
            }
            return output.toString();
        }
    }
}

Related

1. repeat(String s, int num)
2. repeat(String str, String separator, int repeat)
3. repeat(String str, int repeat)