Japanese stocks jumped more than 1 per cent Monday as export-oriented issues were bolstered by a weaker yen. The benchmark Nikkei 225 Stock Average gained 100.92 points, or 1.08 per cent, to end at 9,485.09 while the broader Topix index was up 8.58 points, or 1.06 per cent, at 819.03, according to a report of DPA.