但每次运行度出现如下异常:"FancySrcCanvas.java": unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown at line 57, column 23
"FancySrcCanvas.java": unreported exception java.io.IOException; must be caught or declared to be thrown at line 62, column 17
"FancySrcCanvas.java": unreported exception java.io.IOException; must be caught or declared to be thrown at line 69, column 11