SCJP题库 希望可以帮助你

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1、yModule1-JAVA基础一、选择题：Question1Given:35.String#name="JaneDoe";36.int$age=24;37.Double_height=123.5;38.double~temp=37.5;Whichtwoaretrue?(Choosetwo.)A.Line35willnotcompile.B.Line36willnotcompile.C.Line37willnotcompile.D.Line38willnotcompile.Answer:AD标识符以字母，下划线，或者$开始Q

2、uestion2Given:11.publicclassTest{12.publicstaticvoidmain(String[]args){13.intx=5;14.booleanb1=true;15.booleanb2=false;16.17.if((x==4)&&!b2)短路运算18.System.out.print("l");19.System.out.print("2");20.if((b2=true)&&b1)21.System.out.print("3");22.}23.}Whatistheresult?A.

3、2B.3C.12D.23E.123F.Compilationfails.G.Anexceptionalisthrownatruntime.Answer:D注意20行，=为赋值，不要被骗Question3Given:42.publicclassClassA{43.publicintgetValue(){44.intvalue=0;45.booleansetting=true;46.Stringtitle="Hello";47.if(value

4、

5、(setting&&title=="Hello")){return1;}48.i

6、f(value==1&title.equals("Hello")){return2;}49.}50.}And:70.ClassAa=newClassA();2171.a.getValue();Whatistheresult?A.1B.2C.Compilationfails.D.Thecoderunswithnooutput.E.Anexceptionisthrownatruntime.Answer:C编译不通过，47行value为int类型不是booleanQuestion4Given:11.publicvoidtestI

7、fA(){12.if(testIfB("True")){13.System.out.println("True");14.}else{15.System.out.println("Nottrue");16.}17.}18.publicBooleantestIfB(Stringstr){19.returnBoolean.valueOf(str);20.}WhatistheresultwhenmethodtestIfAisinvoked?A.TrueB.NottrueC.Anexceptionisthrownatruntime

8、.D.Compilationfailsbecauseofanerroratline12.E.Compilationfailsbecauseofanerroratline19.Answer:A19行，如果str为true则返回ture，否则返回falseQuestion5Given:11.publicstaticvoidmain(String[]args){12.Integeri=newInteger(1)+newInteger(2);13.switch(i){14.case3:System.out.println("thr

9、ee");break;15.default:System.out.println("other");break;16.}17.}Whatistheresult?A.threeB.otherC.Anexceptionisthrownatruntime.D.Compilationfailsbecauseofanerroronline12.E.Compilationfailsbecauseofanerroronline13.F.Compilationfailsbecauseofanerroronline15.Answer:A就是

10、两个Integer类型相加Question6Given:11.publicstaticvoidmain(String[]args){12.Stringstr="null";13.if(str==null){14.System.out.println("null");15.}else(str.length