publicclassThreads1{intx=0;publicclassRunnerimplementsRunnable{publicvoidrun(){intcurrent=0;for(int=i=0;i<4;i++){current=x;System.out.print(current+,);x=current+2;}}}publicstaticvoidmain(String[]args){newThreads1().go();}publicvoidgo(){Runnabler1=newRunner();newThread(r1).start();newThread(r1).start();}}Whichtwoarepossibleresults?()
A.0,2,4,4,6,8,10,6,
B.0,2,4,6,8,10,2,4,
C.0,2,4,6,8,10,12,14,
D.0,0,2,2,4,4,6,6,8,8,10,10,12,12,14,14,
E.0,2,4,6,8,10,12,14,0,2,4,6,8,10,12,14,
第1题:
A.0
B.1
C.2
D.3
第2题:
A.55
B.56
C.65
D.66
第3题:
A.0123
B.012
C.0123456789
D.012456789
第4题:
publicclassTestFive{privateintx;publicvoidfoo(){intcurrent=x;x=current+1;}publicvoidgo(){for(inti=0;i<5;i++){newThread(){publicvoidrun(){foo();System.out.print(x+,);}}.start();}}}Whichtwochanges,takentogether,wouldguaranteetheoutput:1,2,3,4,5,?()
A.Movetheline12printstatementintothefoo()method.
B.Changeline7topublicsynchronizedvoidgo(){.
C.Changethevariabledeclarationonline3toprivatevolatileintx;.
D.Wrapthecodeinsidethefoo()methodwithasynchronized(this)block.
E.Wraptheforloopcodeinsidethego()methodwithasynchronizedblocksynchronized(this){//forloopcodehere}.
第5题:
publicclassThreads4{publicstaticvoidmain(String[]args){newThreads4().go();}publicvoidgo(){Runnabler=newRunnable(){publicvoidrun(){System.out.print(”foo”);}};Threadt=newThread(r);t.start();t.start();}}Whatistheresult?()
A.Compilationfails.
B.Anexceptionisthrownatruntime.
C.Thecodeexecutesnormallyandprints?foo”.
D.Thecodeexecutesnormally,butnothingisprinted.
第6题:
A.Compilationfails.
B.Thecoderunswithnooutput.
C.Anexceptionisthrownatruntime.
D.Thecoderuns,outputingaconcatenatedlistoftheargumentspassedtotheprogram.
第7题:
A.finished
B.Compilationfails.
C.AnAssertionErroristhrown.
D.AnAssertionErroristhrownandfinishedisoutput.
Thisquestionisabittrickybecauseitlacksthefollowinginformation:Itshouldincludeastatementthatsayswhetherornotassertionsareenabled.Iftheyareindeedenabled,the
correctionanswerisC.butiftheyarenot,thecorrectanswerisA.Assertionsarenotenabledbydefaultsoifthequestionisnotchanged,themostlogicalanswerisA.
第8题:
class TestApp{ public static void main (String[ ] args){ for(int i=0;i<10;i++){ if(i==3) break; System.out.print (i); } } } 程序运行后的输出是哪项?()
第9题:
下列程序的功能是:输出200以内的所有素数。请填空。 usingSystem; classProgram { publicboolsushu(intx) { k=Convert.ToInt32(Math.Sqrt(x)) for(i=2;i<=k;i++) if(x%i==0)returnfalse; (break); }publicstaticvoidMain(string[]args) { inti,j;for(i=3;i<=200;i=i+2) { if(())Console.WriteLine(“{0}”,i);
第10题:
public class Threads 1 { intx=0; public class Runner implements Runnable { public void run() { int current = 0; for(int=i=0;i<4;i++){ current = x; System.out.print(current + “, “); x = current + 2; } } } public static void main(String[] args) { new Threads1().go(); } public void go() { Runnable r1 = new Runner(); new Thread(r1).start(); new Thread(r1 ).start(); } } Which two are possible results?()
第11题:
第12题:
第13题:
A.6
B.7
C.8
D.10
第14题:
A.0123
B.012
C.0123456789
D.012456789
第15题:
A.55
B.56
C.65
D.66
第16题:
publicclassTestOneimplementsRunnable{publicstaticvoidmain(String[]args)throwsException{Threadt=newThread(newTestOne());t.start();System.out.print(”Started”);t.join();System.out.print(”Complete”);}publicvoidrun(){for(inti=0;i<4;i++){System.out.print(i);}}}Whatcanbearesult?()
A.Compilationfails.
B.Anexceptionisthrownatruntime.
C.Thecodeexecutesandprints“StartedComplete”.
D.Thecodeexecutesandprints“StartedComplete0123”.
E.Thecodeexecutesandprints“Started0l23Complete”.
第17题:
A.0
B.null
C.Compilationfails.
D.ANullPointerExceptionisthrownatruntime.
E.AnArrayIndexOutOfBoundsExceptionisthrownatruntime.
第18题:
A.finished
B.Compilationfails.
C.AnAssertionErroristhrownandfinishedisoutput.
D.AnAssertionErroristhrownwiththemessage“assertionfailed”.
E.AnAssertionErroristhrownwiththemessage“assertionpassed”.
第19题:
本题定义了一个长度为l0的boolean型数组,并给数组元素赋值,要求如果数组元素下标为奇数,则数组元素值 为false,否则为true。 public class javal{ pubhc static void main(String[]args){ boolean b[]= ; for(int i=0;i<10;i++){ if( ) b[i]=false; else ; } for(int i=0;i<10;i++) System.Out.print("bE"+i+"]="+b[i]+","); } }
第20题:
下列程序的功能是:输出100以内能被3整除且个位数为6的所有整数。请填空。 usingSystem; classProgram{ publicstaticvoidMain(string[]args) { int i,j; for(()); (); i++) { j=i*10+6; if((j%3==0))continue; Console.WriteLine(“{0}”,j);
第21题:
下列程序的运行结果是() classProgramx=0,y=-1; { publicstaticvoidMain(string[]args) { int i=0,s=1; do{s/=s+1;i++; } while(i<=10); Console.WriteLine(“i={0},s={1}”,i,s);
第22题:
public class TestFive { private int x; public void foo() { int current = x; x = current + 1; } public void go() { for(int i=0;i<5;i++) { new Thread() { public void run() { foo(); System.out.print(x + “, “); } }.start(); }}} Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?()
第23题:
0, 2, 4, 4, 6, 8, 10, 6,
0, 2, 4, 6, 8, 10, 2, 4,
0, 2, 4, 6, 8, 10, 12, 14,
0, 0, 2, 2, 4, 4, 6, 6, 8, 8, 10, 10, 12, 12, 14, 14,
0, 2, 4, 6, 8, 10, 12, 14, 0, 2, 4, 6, 8, 10, 12, 14,