publicabstractclassAbstractTool{protectedArrayListledger;publicAbstractTool(){ledger=newArrayList();}publicATgetToolAt(inti){returnledger.get(i);}//MorecodeWhichoperatesonLedger...}publicclassToolextendsAbstractTool{publicTool(){super();}}如何正确调用super以传递ATTool的通用到AbstractTool构造函数？看来不管我挑什么AT当我宣布To