相关疑难解决方法(0)

考虑这个功能:

public boolean foo(){
   System.exit(1);
   //The lines beyond this will not be read
   int bar = 1;                  //L1
   //But the return statement is required for syntactically correct code
   return false;                 //L2

   //error here for unreachable code
   //int unreachable = 3;        //L3

}

有人可以解释为什么L1和L2明显无法访问不会发出警告但L3会发出警告.