java - custom compile time error -

i want show compile time error when call method.

like have class "myclass" in there 2 methods "methoda()" , "methodb()". make instance of "myclass" . using instance can call both methods need show compile time error if call "methodb()" before "methoda()"; strong text

class myclasss {     public void methoda()     {         //do thing     }     public void methodb()     {         //do thing     } } class myrunningclasss {     public static void main(string... args)     {         myclass mc = new myclass();          // not give compile time error.         mc.methoda();         mc.methodb();          // have  give compile time error.         mc.methodb();         mc.methoda();      }  } 

what suggesting isn't easy. need download openjdk , change it. it's large code base don't suggest that.

instead suggest add runtime assertion check , unit test code. if use maven or ant run tests part of build, these error detect @ build time, if tests, not compiler detects error.

what makes particularly difficult compiler if can number of things difficult determine @ compile time.

e.g.

public static somethinga(int n) {     //     if(n == x)        mc.methoda(); }  public static somethingb(int n) {     //     if(n == y)         mc.methodb(); }  // compile error or not for(int i=0;i<10;i++) {     somethingb(i);     somethinga(i); } 

there many patterns such feature useful, hard solve. e.g. making sure lock.unlock() after lock.lock(), can place these in different methods, or put conditions on them.