找不到符号

/85/1677/FJGx/HelloWorld.java:15: error: cannot find symbol if(num[i] > max){   ^  symbol:   variable num  location: class HelloWorld /85/1677/FJGx/HelloWorld.java:21: error: cannot find symbol        if(num[i] < min){           ^  symbol:   variable num  location: class HelloWorld 哪错了？