ArrayUtil.java

package pl.piotrsukiennik.whowhen.shared.util;

/**
 * @author Piotr Sukiennik
 */
public class ArrayUtil {

    public static <T> void fillWithInstances( T[] arr, Class<T> instanceClazz, Object... args ) {
        Class[] argClasses = new Class[args.length];
        for ( int i = 0; i < args.length; i++ ) {
            argClasses[i] = args[i].getClass();
        }
        for ( int i = 0; i < arr.length; i++ ) {
            try {
                arr[i] = instanceClazz.getConstructor( argClasses ).newInstance( args );
            }
            catch ( Exception e ) {
                throw new RuntimeException( e );
            }
        }
    }

    public static <T> String join( T[] arr, String joinWith ) {
        String result = "";
        String joinWithTmp = "";
        for ( T t : arr ) {
            result += joinWithTmp + t;
            joinWithTmp = joinWith;
        }
        return result;
    }


    public static String join( double[] arr, String joinWith ) {
        String result = "";
        String joinWithTmp = "";
        for ( double t : arr ) {
            result += joinWithTmp + t;
            joinWithTmp = joinWith;
        }
        return result;
    }
}