轉 http://zhaoyl.javaeye.com/blog/200021
CategoryPlot categoryplot = (CategoryPlot)chart.getPlot();
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
decimalFormat = new DecimalFormat("格式");
numberaxis.setNumberFormatOverride(decimalFormat);
//格式將指定縱坐標的顯示格式,可以顯示整數,小數,百分比等
比如:
0.00 顯示如:56.89
0.00% 顯示如:56.89%
0 顯示如57
0% 顯示如57%