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2. ÔĶÁÏÂÃæµÄJava´úÂë int[] arr; int n = 5; n = n * 2 +1; arr = new int[n];

System.out.println(arr.length); ³ÌÐòÊä³öµÄ½á¹ûÊÇ£¨Ñ¡Ò»Ï A¡¢5 B¡¢8 C¡¢10 D¡¢11

½â´ð¹ý³Ì£º n = n*2+1; ¼ÆËã³ön=11;arr = new int[11]

3. ÔÚ Java ÓïÑÔÖÐ , ÏÂÃæ ( ) תÒåÐòÁбíʾ»»ÐС££¨Ñ¡Ò»Ï A¡¢\\a B¡¢\\n C¡¢\\r D¡¢\\f

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5.

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A¡¢0 B¡¢12 C¡¢12.0 D¡¢12.5

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ÔÚJava ÓïÑÔÖУ¬ÏÂÁдúÂëµÄÊä³ö½á¹ûÊÇ£¨Ñ¡Ò»Ï public static void main(String[] args) { int i=5, j=10; do { if(i>j) { break; } j--; i++; }while(j!=i);

System.out.println( i + \} A¡¢8,7 B¡¢9,6 C¡¢7,6 D¡¢7,8

½â´ð¹ý³Ì£º 1.i=5,j=10 2.i=6,j=9 3.i=7,j=8 4.i=8,j=7 7.

ÔÚJava ÓïÑÔÖж¨ÒåÁËÈçϱäÁ¿£ºdouble x=10.0, y=3.0; int z=2;ÏÂÃæÇ¿ÖÆ×ª»»·û¶¼·¢ÉúÁË×÷Ó㬳ýÁË£¨Ñ¡Ò»Ï A¡¢(int)(x+y/z); B¡¢(double)(x/y); C¡¢(int)x; D¡¢(int)(y+z);

½â´ð¹ý³Ì£º x/y½á¹ûÊÇdoubleÀàÐÍµÄ Ç¿ÖÆ×ª»»Ã»·¢Éú×÷Óà 8.

ÔÚJAVA±à³ÌÖУ¬Ô´´úÂëÎļþµÄÀ©Õ¹ÃûΪ£¨Ñ¡Ò»Ï A¡¢.class B¡¢.java C¡¢.com

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ÃèÊöA£º¡®8¡¯Óë8ÊÇÏàͬµÄ ÃèÊöB£º¡®£¤¡¯µÄÊý¾ÝÀàÐÍÊÇchar ÏÂÃæµÄÑ¡Ïî( )ÊÇÕýÈ·µÄ£¨Ñ¡Ò»Ï A¡¢Á½¸öÃèÊö¶¼ÊÇÕýÈ·µÄ B¡¢Ö»ÓÐÃèÊöAÊÇÕýÈ·µÄ C¡¢Á½¸öÃèÊö¶¼ÊÇ´íÎóµÄ D¡¢Ö»ÓÐÃèÊöBÊÇÕýÈ·µÄ

½â´ð¹ý³Ì£º¡®8¡¯µÄÊý¾ÝÀàÐÍΪchar£»8µÄÊý¾ÝÀàÐÍΪint

public static void showInfo(int a,int b){ a++; b++; }

public static void main(String[] args) { int a = 5; int b = 10;

System.out.println(a + \ showInfo(a,b);

System.out.println(a + \}

A¡¢5,10 5,10 B¡¢5,10 6,11 C¡¢5,10 4,11 D¡¢5,10 5,11

½â´ð¹ý³Ì£ºa,b×÷ΪֵÀ´´«µÝ£¬Öµ´«µÝÊDz»¸Ä±äÔ­À´ÊôÐÔµÄÖµµÄ

11. ÔÚJAVAÓïÑÔÖУ¬( )Óï¾ä¿ÉÒÔ½áÊø±¾´ÎÑ­»·¶ø²»»á½áÊøÕû¸öÑ­»·¡££¨Ñ¡Ò»Ï[148]

A¡¢next B¡¢continue C¡¢switch D¡¢break

½â´ð¹ý³Ì£º

break£º½áÊøÑ­»·£¬Ìø³öÕû¸öÑ­»·

continue£ºÌø³ö±¾´ÎÑ­»·£¬½øÈëÏÂÒ»´ÎÑ­»·

ÔÚjavaÖе¥ÒýºÅÒýµÄÊý¾Ý ÊÇcharÀàÐÍµÄ Ë«ÒýºÅÒýµÄÊý¾Ý ÊÇStringÀàÐ͵Ä

10. ÔÚJAVAÓïÑÔÖÐ, ÏÂÁдúÂëµÄÔËÐнá¹ûÊÇ£¨Ñ¡Ò»Ï[50£¬56]

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12. ÔÚJAVAÓïÑÔÖУ¬3/5µÄÖµÊÇ£¨Ñ¡Ò»Ï[114,128]

A¡¢1 B¡¢0 C¡¢2 D¡¢0.6

½â´ð¹ý³Ì£º

13. ÔÚJavaÓïÑÔÖУ¬5/3µÄÖµÊÇ£¨Ñ¡Ò»Ï

A¡¢1 B¡¢¨C1 C¡¢2 D¡¢1.67

½â´ð¹ý³Ì£º

14. ÔÚJavaÓïÑÔÖУ¬¼ÙÉèÒÔÏÂËùÓбäÁ¿¾ùΪÕûÐÍ£¬ÔòÏÂÁдúÂëÖ´ÐкócµÄÖµÊÇ£¨Ñ¡Ò»Ï

a=2;b=5;b++;c=a+b; A¡¢5 B¡¢6 C¡¢7 D¡¢8

½â´ð¹ý³Ì£ºb++;c=a+b; ´Ëʱb==6

15. ÔÚJavaÓïÑÔÖУ¬¾­¹ýÈçÏÂÔËËãºó£¬numµÄֵΪ£¨Ñ¡Ò»Ï[49£¬66£¬154£¬163]

int num = 0; num = 2>3?0:1; A¡¢0 B¡¢1 C¡¢2 D¡¢3

½â´ð¹ý³Ì£ºÈýÄ¿ÔËËã·û£¬¶ÔÓÚÌõ¼þ±í´ïʽb?x:y£¬ÏȼÆËãÌõ¼þb£¬È»ºó½øÐÐÅжϡ£Èç¹ûbµÄֵΪtrue£¬¼ÆËãxµÄÖµ£¬ÔËËã½á¹ûΪxµÄÖµ£»·ñÔò£¬¼ÆËãyµÄÖµ£¬ÔËËã½á¹ûΪyµÄÖµ¡£

16. ÔÚJAVAÓïÑÔÖУ¬¾²Ì¬±äÁ¿Ó㨠£©ÐÞÊεġ££¨Ñ¡Ò»Ï

A¡¢static B¡¢final C¡¢abstract D¡¢interface

5,3¶¼ÊÇintÀàÐ͵Ä,int/int ½á¹ûĬÈÏΪint,»áÔì³É¾«¶È¶ªÊ§ ±ãÓÚÀí½â £º 5/3=1¡­¡­2

3,5¶¼ÊÇintÀàÐ͵Ä,int/int ½á¹ûĬÈÏΪint,»áÔì³É¾«¶È¶ªÊ§ ±ãÓÚÀí½â£º 3/5=0¡­¡­3

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17. ÔÚJavaÓïÑÔÖУ¬ÄÜÕýÈ·±íʾaºÍbͬʱΪÕý»òͬʱΪ¸ºµÄ±í´ïʽÊÇ£¨Ñ¡Ò»Ï[30£¬48]

A¡¢(a >=0 || b >= 0) && (a < 0 || b < 0) B¡¢a * b > 0

C¡¢(a + b > 0) && (a + b <= 0)

D¡¢(a >= 0 && b >= 0) && (a < 0 && b < 0)

½â´ð¹ý³Ì£ºÌâÄ¿µÄ¿ÉÒÔ»»ÖÖ·½Ê½Àí½â£¬µ±aºÍbͬʱΪÕý»òͬʱΪ¸ºÊ±£¬ÏÂÃæ±í´ïʽΪtrue ²¢ ÓмÙΪ¼Ù »ò ÓÐÕæÎªÕæ

A¡¢$95 B¡¢_wii C¡¢3psp D¡¢break;

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abstract default if private this do implements protected throw break import public throws else instanceof return transient case extends

Boolean byte short int long float double char try catch finally final interface static void strictfp volatile class native

super while

constfor new switch null

continue goto package synchronized

19. ÔÚJAVAÓïÑÔÖУ¬ÏÂÁÐ( )ÊǺϷ¨µÄ±êʾ·û£¨Ñ¡Á½Ï

A¡¢Main B¡¢p234 C¡¢4x D¡¢short

20. ÔÚJAVAÓïÑÔÖÐ,ÏÂÁÐJAVAÓïÑÔ´úÂëµÄÑ­»·ÌåÖ´ÐеĴÎÊýÊÇ£¨Ñ¡Ò»Ï

int n=2; while(n == 0){

System.out.println(n);

18. ÔÚJavaÓïÑÔÖУ¬ÏÂÁУ¨ £©ÊǺϷ¨µÄ±êʾ·û£¨Ñ¡Á½Ï[19£¬45£¬96£¬97£¬110£¬145£¬150]

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n--; } A¡¢0 B¡¢1 C¡¢2 D¡¢3

½â´ð¹ý³Ì£ºn==2,whileÑ­»·ÅжÏÌõ¼þΪn==0,¹ÊûÓнøÑ­»·ÌåÄÚ

21. ÔÚJavaÓïÑÔÖУ¬ÏÂÁбäÁ¿¶¨ÒåºÍ¸³Öµ´íÎóµÄÊÇ£¨Ñ¡Ò»Ï

A¡¢short i=5;int j=i; B¡¢char c = \ C¡¢float f = 'c'+1; D¡¢float i=5;double d=i;

½â´ð¹ý³Ì£ºÔÚjavaÖе¥ÒýºÅÒýµÄÊý¾Ý ÊÇcharÀàÐ͵Ä

22. ÔÚJavaÓïÑÔÖУ¬ÏÂÁбí´ïʽµÄÔËËãµÄ½á¹ûÊÇ£¨Ñ¡Ò»Ï

10/2 +5£» A¡¢5 B¡¢7 C¡¢10 D¡¢12

½â´ð¹ý³Ì£º%È¡ÓàÔËËã·û 5=5

23. ÔÚJavaÓïÑÔÖУ¬ÏÂÁдúÂëµÄÊä³ö½á¹ûÊÇ£¨Ñ¡Ò»Ï[35]

public static void main(String[] args) { int[] num={10,20,51,40,50}; System.out.println(num[2]); } A¡¢40 B¡¢50 C¡¢51 D¡¢60

½â´ð¹ý³Ì£ºÔÚjavaÖÐÊý×é½Ç±ê´Ó0¿ªÊ¼¡£Num[2]ΪÊý×éÖеÚÈý¸öÔªËØ

24. ÔÚJAVAÓïÑÔÖÐ,ÏÂÁдúÂëµÄÊä³ö½á¹ûÊÇ£¨Ñ¡Ò»Ï

public static void main(String args[]){ int i,j=0;

for(i=1;i<10;i++){ if(i%4==0)

Сд×ÖĸcµÄASCIIÂëÊÇ 99

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continue; j =i; }

System.out.println(i + \} A¡¢10,9 B¡¢3,6 C¡¢10,8 D¡¢4,10

½â´ð¹ý³Ì£º1-1 2-2 3-3 4-3 5-5 6-6 7-7 8-7 9-9 10Ñ­»·½áÊø forÑ­»·µÄÖ´ÐÐ˳ÐòÓÃÈçϱí´ïʽ£º for(expression1;expression2;expression3) {

expression4; }

Ê×ÏÈÖ´Ðбí´ïʽexpression1£¨Ò»°ãΪ³õʼ»¯Óï¾ä£©£»ÔÙÖ´ÐÐexpression2£¨Ò»°ãΪÌõ¼þÅжÏÓï¾ä£©£¬ÅжÏexpression1ÊÇ·ñ·ûºÏexpression2µÄÌõ¼þ£»Èç¹û·ûºÏ£¬ÔòÖ´ÐÐexpression4£¬·ñÔò£¬Í£Ö¹Ö´ÐУ»×îºóÖ´ÐÐexpression3¡£

int a = 1, sum = 0; while (a< 3){ sum = sum + a; a++; }

System.out.println(sum); A¡¢2 B¡¢3 C¡¢4

D¡¢ÒÔÉ϶¼²»¶Ô

½â´ð¹ý³Ì£ºµ±a==1ʱ£¬;sum==1,a==2;

26. ÔÚJAVAÓïÑÔÖÐ,ÏÂÁдúÂëµÄÔËÐнá¹ûÊÇ£¨Ñ¡Ò»Ï

public static void main(String args[]) { int stuAge[] = {18,22,26}; int i, avgAge = 0; for(i = 0; i < 3; i++){ avgAge += stuAge[i] / 3; }

System.out.println( avgAge );

µ±a==2ʱ£¬sum=3,a==3; µ±a==3ʱ£¬Ñ­»·½áÊø

25. ÔÚJavaÓïÑÔÖУ¬ÏÂÁдúÂëµÄÔËÐнá¹ûÊÇ£¨Ñ¡Ò»Ï

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} A¡¢0 B¡¢9 C¡¢11 D¡¢21

½â´ð¹ý³Ì£º18/3+22/3+26/3 intÔËËãĬÈϽá¹ûΪint,¾«¶È¶ªÊ§£¬avgAge =6+7+8

27. ÔÚJAVAÓïÑÔÖУ¬ÏÂÁдúÂëÔËÐеĽá¹ûÊÇ£¨Ñ¡Ò»Ï

int a=1,b=3,c=5; if(a>b) if(b>c) c=a+b; else c=a*b;

System.out.println( a + \A¡¢1 3 5 B¡¢1 3 4 C¡¢1 3 6 D¡¢1 3 3

½â´ð¹ý³Ì£ºÒòΪa

28. ÔÚJavaÓïÑÔÖУ¬ÏÂÁжÔÓÚ×Ö·ûÊý×éµÄ¶¨Òå²¢¸³ÖµÕýÈ·µÄÊÇ£¨Ñ¡Ò»Ï

A¡¢char[ ] name = new char[4]; B¡¢char[ ] name = {'S','V','S','E'}; C¡¢char[4] name = \D¡¢char[4] name = {'S','V','S','E'};

½â´ð¹ý³Ì£ºÌâĿҪÇó×Ö·ûÊý×éµÄ¶¨Òå²¢¸³Öµ£¬AÏîÖ»ÊǶ¨Ò壬CÏîÔÚjavaÖв»Ê¹Óã¬DÏî²»ÄÜÔÙÉùÃ÷ÊǶ¨Ò峤¶È£¬²Î¿¼AÏî¡£

29. ÔÚJavaÓïÑÔÖУ¬ÏÂÁйØÓÚ·½·¨µÄÓŵ㣬˵·¨´íÎóµÄÊÇ£¨Ñ¡Ò»Ï

A¡¢Í¨¹ýʹÓ÷½·¨£¬¿ÉÒÔÌṩ³ÌÐò¿ª·¢µÄЧÂÊ B¡¢Í¨¹ýʹÓ÷½·¨£¬¿ÉÒÔÌá¸ß´úÂëµÄÖØÓÃÐÔ C¡¢Í¨¹ýʹÓ÷½·¨£¬Ê¹µÃ³ÌÐòµÄά»¤±äµÃ¸´ÔÓ D¡¢Í¨¹ýʹÓ÷½·¨£¬Ê¹µÃ³ÌÐòµÄ±äµÃ¼ò¶ÌºÍÇåÎú

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30. (5 > 10) && (3 < 8)µÄ½á¹ûΪ£¨Ñ¡Ò»Ï

A¡¢·Ç0 B¡¢true C¡¢0

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D¡¢false

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31. double x,y; [ͬ46]

x = 2; y = x + 3 / 2; System.out.println(y); Êä³ö½á¹ûÓ¦¸ÃΪ£¨Ñ¡Ò»Ï A¡¢3.5 B¡¢3.0 C¡¢2.0 D¡¢3

½â´ð¹ý³Ì£º3/2 int/int¾«¶È¶ªÊ§ ½á¹ûΪ1

yµÄÊý¾ÝÀàÐÍΪdouble

32. if(Ìõ¼þ){ÓïÃû}ºÍif(Ìõ¼þ)Óï¾äµÄÇø±ðÊÇ£¨Ñ¡Ò»Ï[103]

A¡¢Ã»ÓÐÇø±ð

B¡¢Ò»¸ö¿ÉÒÔÖ´ÐжàÌõÓï¾ä£¬ÁíÒ»¸ö¿ÉÒÔÖ´ÐÐÒ»ÌõÓï¾ä C¡¢¿ÉÒÔÖ´ÐжàÌõÓï¾ä D¡¢²»¿ÉÒÔÖ´ÐжàÌõÓï¾ä

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33. ifÓï¾äµÄ¿ØÖÆÌõ¼þ£¨Ñ¡Ò»Ï

A¡¢Ö»ÄÜÓùØÏµ±í´ïʽ

B¡¢Ö»ÄÜÓùØÏµ±í´ïʽ»òÂß¼­±í´ïʽ C¡¢Ö»ÄÜÓÃÂß¼­±í´ïʽ D¡¢¿ÉÒÔÓÃÈκαí´ïʽ

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int count=0;

for(a=2,b=5;a

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35. int a[] = {3,9,5,6,4};

System.out.println(a[4]) ;

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if(a>5&&a<5){

System.out.println(\}Êä³ö½á¹ûÊÇ£¨Ñ¡Ò»Ï A¡¢ok B¡¢false C¡¢Ã»ÓÐÊä³ö D¡¢true

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37. int i = 0, x = 0;

do {

if (i % 5 == 0) x++; }

while (i < 20); System.out.println(x); Êä³ö½á¹ûÊÇ£¨Ñ¡Ò»Ï A¡¢4 B¡¢10 C¡¢0

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System.out.println(b-a); a++; b--;

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} A¡¢1 B¡¢5 C¡¢10 D¡¢ÎÞÊý±é

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39. Java ÓïÑÔÖÐÓÐÈçÏ´úÂë,ÏÂÁÐxµÄ¶¨ÒåÖÐ,¿ÉÒÔʹÉ϶δúÂëÊä³ö 100 µÄÓУ¨Ñ¡Á½Ï

switch(x){

case 100:System.out.println(\ case 110:System.out.println(\}

A¡¢byte x=100; B¡¢float x=100; C¡¢char x='d'; D¡¢long x=100;

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long(³¤ÕûÐÍ) 64 -9233372036854477808-9233372036854477808 float(¸¡µãÐÍ) 32 -3.40292347E+38-3.40292347E+38

double(Ë«¾«¶È) 64 -1.79769313486231570E+308-1.79769313486231570E+308 char(×Ö·ûÐÍ) 16 ¡® \

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