trojan horse summary

threads JDK5 Unable to wake a specified thread before If the communication between multiple threads, you need to use Notifyall () to notify all threads, use while to repeatedly judge the condition Four. After JDK5, the line program control system 1. Synchronization Synchronizing using the Lock () and Unlock () Methods of the Reentrantlock class 2. Communication Use the Newcondition () method of the Reentrantlock class to get the co

output the value of one \ Multiple variablesint a = ten, c = 11;printf ("a=%d, c=%d", A, c);L Double\float\char output, some tips for formatting charactersDouble height = 1.55;char blood = ' A ';printf ("height=%.2f, blood type is%c", height, blood);L Simple Add-subtract operationint a = 10 + 20;Do not use when not initialized (the following wording is not recommended)int score;printf ("score=%d", score);Transfer of values between 3> variablesL can assign the value of a variable to another vari