Shares on the Tokyo Stock Exchange ended Wednesday in positive terrain, buoyed by the Bank of Japan's (BoJ) announcements of adjustments to monetary policy, including greater flexibility in bond operations.

The Nikkei index closed up 192.98 points or 0.86 percent to close at 22,746.70.

The broader-based Topix index gained 16.47 points or 0.94 percent to end the day at 1,769.76.

The Tokyo Stock Exchange started the day with optimism after the BoJ announced it will ensure greater flexibility in the purchases of government bonds and diversification in exchange-traded funds, with the aim of making monetary policy more sustainable.