/85/1306/Au6U/HelloWorld.java:4: error: illegal character: '\uff08'
String mark =?score>=60?? " ??":"???"?
^
/85/1306/Au6U/HelloWorld.java:4: error: illegal character: '\uff09'
String mark =?score>=60?? " ??":"???"?
^
/85/1306/Au6U/HelloWorld.java:4: error: not a statement
String mark =?score>=60?? " ??":"???"?
^
/85/1306/Au6U/HelloWorld.java:4: error: illegal character: '\uff1b'
String mark =?score>=60?? " ??":"???"?
^
4 errors
String mark =(score >= 60?)"及格":"不及格";
第4行的括号和分号都是全角的,改成半角即可
String mark =(score>=60)? " 及格":"不及格";
String mark = (score>= 60)?"及格" :"不及格";