scjp题库带达内考点分析⑤_⑧答案

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1、ANSWERModule51.BCD2.E3.BDE4.C5.D6.D7.D8.B拖拽题1•Answer:Stringpath=,H,;for(Stringdir:directories){path=path+File.separator+dir;}Filefile=newFile(path,filename);returnfile.exists();2.Answer:reader=newBufferedReader(newFileReader(ninn));writer=newBufferedWriter(newPrintWriter(newFileWriter(Hou

2、tn)));或writer=newPrintWriter(newBufferedWriter(newFileWriter(noutn)));3.Answer:try{Stringtemp;while((temp=buffReader.readLine())!=null){System.out.println(temp);}}catch(IOExceptione){e.printStackTrace();}4.Answer:importjava.io.*;publicclassReadFile{publicstaticvoidmain(String[]args){try{F

3、ilexl二newFile("MyText.txtn);feredReaderx4=newBufferedReader(x2);Stringx3=null;while((x3=x4.readLine())!=null){System.out.println(x3);}x4.close();}catch(Exceptionex){ex.printStackTrace();Module61.D2.BC3.A4.D5.C6.D7.C8.B9.A10.C11.BE12.D13.A14.E15.CF16.B17.FG18.D19.B20.C21.D22.B23.D拖拽题1.Answ

4、er:Piisapproximately3.141593andEisapproximatelytrue2.Answer:while(scanner.hasNext()){if(scanner.hasNextBoolean()){System.out.println(scanner.nextBoolean()+HH);}elsescanner.next();)Module7l.A2.B3.A4.C5.D6.D7.D8.F9.B10.Bll.B12.B13.AD14.B15.A16.CE17.A18.B19.AC20.B21.D22.G23.C24.C25.C26.ACF27

5、.CDG28.D29.ABDE30.ADE31.DF32.A拖拽题1.Answer:allowsaccesstoelementsbytheirintegerindexjava.util.ListdefinesthemethodVget(Objectkey)-java.util.Mapisdesignedforholdingelementspriortoprocessing-java.util.Queuecontainsnopairofelementselande2,suchthatel.equals(e2)-java.util.Set2.Answer:publicclas

6、sNumberNames{privateHashMapmap=newHashMap;publicvoidput(Stringnamejntvalue)}map.put(name,value);}publicSetgetNames(){returnmap.keySet();}}3.Answer:ml(listA);Compilesandrunswithouterrorm2(listA);Compilesandrunswithouterrorml(listB);Compilesandrunswith

7、outerrorm2(listB);Compilationfailsml(listO);Compilationfailsm2(listO);Compilationfails1.Answer:importjava.util.*;publicclassMylntimplementsComparable{publicstaticvoidmain(String[]args){ArrayListlist=newArrayList();list.add(newMylnt(2));list.add(newMyln