static方法只能调用static方法或者变量

public class testa {
String name;
static int  missileNum;
    static void fire(){
if(missileNum>0){
missileNum-=1;
System.out.println("now fire a missileNum!");
}
else{
System.out.println("No missileNum left");
}
}
public static void main(String args[]){
System.out.println("aaaaa");
fire();
}
}