CODEWITHSUNDEEP
javamultithreadingnetbeans-8
user9313201
user9313201

Reputation:

Conditions in Multuithreading

I have this piece of code which is controlling two threads. 

synchronized public void run() {
  switch(ThreadChoice){
      case 1:
      dataBase();
      break;
      case 2:
      ViewTotal.choice=1;new ViewTotal().displayDatabase();
     break;
  }
}

When i use SWITCH statement, it works fine but if i use if,if-else or if-else-if, it doesn't work correctly. Here is the code with if statement. 

synchronized public void run() {

  if(ThreadChoice==1)dataBase();
  else if(ThreadChoice==2)ViewTotal.choice=1;new ViewTotal().displayDatabase();
}

while using the if case, it executes the code in both the conditions but while using the switch, it only executes the specified case. can anybody please elaborate this . i am much confused in it. Thanks in advance

Upvotes: 0

Views: 30

Answers (1)

Andy Turner
Andy Turner

Reputation: 140504

This:

if(ThreadChoice==1)dataBase();
else if(ThreadChoice==2)ViewTotal.choice=1;new ViewTotal().displayDatabase();

is the same as:

if(ThreadChoice==1) {
  dataBase();
} else if(ThreadChoice==2) {
  ViewTotal.choice=1;
}
new ViewTotal().displayDatabase();

If you want the new ViewTotal().displayDatabase(); only to execute for ThreadChoice==2, you need to use braces, and put it inside the appropriate brace:

if(ThreadChoice==1)dataBase();
else if(ThreadChoice==2) { ViewTotal.choice=1;new ViewTotal().displayDatabase(); }

But it's a reasonably good idea always to use braces, and to put one statement per line, so your intent is clear.

Upvotes: 3

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