Java ArrayList Join join(final ArrayList parts, final char separator)

Description

join

License

Open Source License

Declaration

private static String join(final ArrayList<String> parts, final char separator) 

Method Source Code

//package com.java2s;

import java.util.ArrayList;

public class Main {
    private static String join(final ArrayList<String> parts, final char separator) {
        final int size = parts.size();

        /* Calculating the size of the resulting string to avoid redundant buffer re-allocations.
         * /*w  ww. j  a v  a  2  s  . com*/
         * destSize is initialised with the number of separators in the resulting string.
         */
        int destSize = size - 1;
        for (int i = 0; i < size; ++i) {
            destSize += parts.get(i).length();
        }

        // The buffer is created with the necessary capacity.
        final StringBuilder buf = new StringBuilder(destSize);
        int i = 0;
        for (final int n = size - 1; i < n; ++i) {
            buf.append(parts.get(i)).append(separator);
        }
        buf.append(parts.get(i));

        assert buf.length() == destSize;

        return buf.toString();
    }
}

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