我有一个名为“Account”的类publicclassAccount{publicdoublebalance=1500;publicsynchronizeddoublewithDrawFromPrivateBalance(doublea){balance-=a;returnbalance;}}还有一个叫做ATMThread的类publicclassATMThreadextendsThread{doublelocalBalance=0;AccountmyTargetAccount;publicATMThread(Accounta){this.myTargetAccount=a;}pub