private static String[] registerSemiRandomTrades(StockExchange stockExchange) {
String[] symbols = new String[] {"TEA", "POP", "ALE", "JIN", "JOE"};
String[] prices = new String[] {"4.0000", "6.0000", "0.5000", "1.0000", "20.0000"};
long[] quantities = new long[] {100, 200, 300, 100, 100, 200};
TradeType[] types = new TradeType[] {BUY, BUY, SELL, SELL, SELL, BUY};
Random random = new Random(System.nanoTime());
for (int i = 0; i < symbols.length; i++) {
for (int j = 0; j < types.length; j++) {
BigDecimal avgPrice = new BigDecimal(prices[i]);
double var = avgPrice.doubleValue() * 0.05;
double price = avgPrice.doubleValue() + (var * random.nextDouble() - var / 2);
BigDecimal bdPrice =
new BigDecimal(price).setScale(StockExchange.PRECISION, RoundingMode.HALF_DOWN);
switch (types[j]) {
case BUY:
stockExchange.buy(symbols[i], quantities[i], bdPrice);
break;
case SELL:
stockExchange.sell(symbols[i], quantities[i], bdPrice);
break;
}
}
}
return symbols;
}
private static void printStockInfo(StockExchange stockExchange, String[] symbols) {
System.out.printf(" %7s %7s %9s\n", "Price", "Yield", "P/E Rat");
for (int i = 0; i < symbols.length; i++) {
System.out.printf(
"%3s %7s %7s%% %9s\n",
symbols[i],
stockExchange.calculateStockPrice(symbols[i]),
stockExchange.calculateDividentYield(symbols[i]).scaleByPowerOfTen(2),
stockExchange.calculatePERatio(symbols[i]));
}
System.out.printf("\n--- All share index: %7s\n", stockExchange.calculateAllShareIndex());
}