合并任意个数组生成一个新的数组

/** 
 * 合并任意个数组 
 * @param first 
 * @param rest 
 * @param <T> 
 * @return 
 */  
public static <T> T[] concat(T[] first, T[]... rest) {  
    int totalLength = first.length;  
    for (T[] array : rest) {  
        totalLength += array.length;  
    }  
    T[] result = java.util.Arrays.copyOf(first, totalLength);  
    int offset = first.length;  
    for (T[] array : rest) {  
        System.arraycopy(array, 0, result, offset, array.length);  
        offset += array.length;  
    }  
    return result;  
}