¡¶Java±à³Ì»ù´¡ÖªÊ¶µã»ã×ܼ°Ï°Ì⼯¡·--´ð°¸ ÏÂÔØ±¾ÎÄ

3¡¢ÏÂÃæ·½·¨ÊÇÇó100~1000µÄË®ÏÉ»¨Êý£¬¸ÄÕý·½·¨ÖеĴíÎó¡£

static int fun(int n){ int i,j,k; i=n0; //i=n/100

j=n-i*10; //j=n/10-i*10

k = n/10; //k = n ; if(i*100+j*10+k==i*i*i+j*j*j+k*k*k) return n; else

return 0;

}

3¡¢ ÒÔϳÌÐòµÄ¹¦ÄÜÊǼÆËãÏÂÃæº¯ÊýµÄÖµ£¬¸ÄÕý·½·¨ÖеĴíÎó¡£

public class Fun{ static double fun(double x,double y,double z){ return Math.sin(x)/(Math.sin(x-y)*Math.sin(x-z)) } public static void main(String args[]){ double x=20,y=30,z=40; System.out.println(fun(x,y,z)+fun(x,y,z)-fun(z,x,y)); } }

ËÄ¡¢ ÔĶÁ³ÌÐò

1¡¢ ÔĶÁÏÂÁгÌÐò£¬ËµÃ÷³ÌÐòµÄ¹¦ÄÜ public static int sumDigits(long n){ int sum = 0; while(n / 10 != 0){ sum += n % 10; n = n / 10; } sum = sum + n;

2¡¢ ÔĶÁÏÂÁгÌÐò£¬ËµÃ÷³ÌÐòµÄ¹¦ÄÜ

public static void sort(int num1, int num2, int num3){ int temp; if(num1 > num2) { temp = num1; num1 = num2; num2 = temp; } if(num2 > num3) { temp = num2; num2 = num3; num3 = temp; } if(num1 > num2) { temp = num1; num1 = num2; num2 = temp; } System.out.println(\ÊäÈëµÄÈý¸öÊý°´ÉýÐòÅÅÁÐΪ\ }

Îå¡¢ ±à³ÌÌâ

1¡¢ ʹÓÃÏÂÊö·½·¨Í·£¬¼ÆËãÒ»¸öÕûÊý¸÷λÊý×ÖÖ®ºÍ¡£

public static int sumDigits(long n) 2¡¢ ±àдÒÔÏ·½·¨£¬°´ÉýÐòÅÅÁÐÈý¸öÊý²¢Êä³ö¡£

public static void sort(int num1, int num2, int nums)

3¡¢ ±àдһ¸öÇó¡°s=a+aa+aaa+?+aaa?a¡±µÄÖµµÄ·½·¨£¬ÆäÖÐaÊÇÒ»¸ö1µ½9Ö®¼äµÄÊý×Ö¡£ÀýÈç

¡°2+22+222+2222+22222¡±£¨´Ëʱ¹²ÓÐ5¸öÊýÏà¼Ó£©£¬ÓÉÓû§ÊäÈëÈ·¶¨Ïà¼ÓÏîÊý¡£

4¡¢ Ò»¸öÊýÈç¹ûÇ¡ºÃµÈÓÚËüµÄÒò×ÓÖ®ºÍ£¬Õâ¸öÊý¾Í³ÆÎªÍêÊý£¬ÀýÈç6=1+2+3¡£±à³ÌÕÒ³ö1000ÒÔ

ÄÚµÄËùÓÐÍêÊý¡£

5¡¢ ±àдһ¸ö·½·¨£¬¼ÆËãÏÂÁм¶Êý¡£

m(i)=1/2+2/3+?+i/(i+1)

µÚÁùÕ Êý×é

1¡¢Ò»Î¬Êý×éÉùÃ÷Óë´´½¨

? ÉùÃ÷: Êý¾ÝÀàÐÍ[ ] Êý×éÃû;

»òÕß

Êý¾ÝÀàÐÍ Êý×éÃû

[ ];

? ´´½¨:

Êý×éÃû = new Êý¾ÝÀàÐÍ[Êý×鳤¶È];

? ÉùÃ÷ And ´´½¨£º

Êý¾ÝÀàÐÍ[] Êý×éÃû = new Êý¾ÝÀàÐÍ[Êý×鳤¶È] »ò

Êý¾ÝÀàÐÍ Êý×éÃû[] = new Êý¾ÝÀàÐÍ[Êý×鳤¶È]

2¡¢Ò»Î¬Êý×顪³õʼ»¯

? ¶¯Ì¬³õʼ»¯£ºÊý×éÃû[ϱê] = Öµ; ? ¾²Ì¬³õʼ»¯£º Êý¾ÝÀàÐÍ Êý×éÃû[] = {ÔªËØ1£¬ÔªËØ2£¬ÔªËØ3£¬ÔªËØ4? ?}; »ò

Êý¾ÝÀàÐÍ Êý×éÃû[] =

new Êý×éÀàÐÍ[]{ÔªËØ1£¬ÔªËØ2£¬ÔªËØ3£¬? ?};

3¡¢Ò»Î¬Êý×顪ÒýÓÃ

? ÒýÓøñʽ£ºÊý×éÃû[ϱê];

? ϱêȡֵ·¶Î§Îª0¡ª£¨Êý×鳤¶È-1£©

? Êý×éµÄ³¤¶ÈÓÃlengthÈ¡µÃ£¬µ÷ÓøñʽΪ £ºÊý×éÃû.length 4¡¢Êý×é³£¼ûµÄ²Ù×÷¡ªÊý×é±éÀú

? Êý×éµÄ±éÀú£ºÒÀ´Î·ÃÎÊÊý×éÖеÄÿ¸öÔªËØ ? for Ñ­»·µÄÓ﷨Ϊ£º

for (int i=0£»i< Êý×éÃû.length£»i++) { ?//´¦ÀíÔªËØµÄÏà¹Ø´úÂë }

? foreachÑ­»·µÄÓ﷨Ϊ£º

for (Êý¾ÝÀàÐÍ ±äÁ¿£ºÊý×éÃû) { ?//´¦ÀíÔªËØµÄÏà¹Ø´úÂë }

5¡¢¶þάÊý×é---ÉùÃ÷Óë´´½¨

? ÉùÃ÷ Êý¾ÝÀàÐÍ Êý×éÃû[ ][ ];

»òÕß Êý¾ÝÀàÐÍ[ ][ ] Êý×éÃû;

? ´´½¨ Êý×éÃû = new Êý¾ÝÀàÐÍ[cel][ce2]; ? ÉùÃ÷ And ´´½¨

Êý¾ÝÀàÐÍ[][] Êý×éÃû = new Êý¾ÝÀàÐÍ[ce1] [ce2]

»ò

Êý¾ÝÀàÐÍ Êý×éÃû[][] = new Êý¾ÝÀàÐÍ[ce1] [ce2]

6¡¢¶þάÊý×é²»¹æÔò´´½¨

? Êý×éÃû = new Êý¾ÝÀàÐÍ[ce][]; ? Êý×éÃû[0] = new Êý¾ÝÀàÐÍ[ce0]; ? Êý×éÃû[1] = new Êý¾ÝÀàÐÍ[ce1]; ? ??

¿ÎÌüǼ

? Êý×éÃû[N] =

new Êý¾ÝÀàÐÍ[ceN];

7¡¢¶þάÊý×顪³õʼ»¯ºÍÒýÓÃ

? ¾²Ì¬³õʼ»¯:

int arr[][]={{2,3},{1,5,6,8},{3,4,9}}¡£

? ¶¯Ì¬³õʼ»¯: float numthree= new int[10][10]; numthree[0][0]=1.5f; numthree[0][1]=1.3f; ?. ?.

? ÒýÓãºÊý×éÃû[ϱê1] [ϱê2];

Á·Ï°Ìâ

Ò»¡¢ Ìî¿ÕÌâ

1¡¢Èôint[]a={12,45,34,46,23}£¬Ôòa[2]= ( )

2¡¢Èôinta[3][2]={{123,345},{34,56},{34,56}}£¬Ôòa[2][1]=( )

3¡¢ÒÑÖª£ºint a[ ]={2,4,6,8}; Ôò£º±í´ïʽ(a[0]+=a[1])+ ++a[2]ֵΪ£¨ £©¡£ 4¡¢ÔÚJavaÖУ¬×Ö·û´®ºÍÊý×éÊÇ×÷Ϊ£¨¶ÔÏ󣩳öÏֵġ£ 5¡¢Êý×é¶ÔÏóµÄ³¤¶ÈÔÚÊý×é¶ÔÏó´´½¨Ö®ºó£¬£¨ £©¸Ä±ä¡£Êý×éÔªËØµÄϱê×ÜÊÇ´Ó£¨ £©¿ªÊ¼¡£ 6¡¢¶ÔÓÚÊý×éint[][] ={{1,2,3},{4,5,6}}À´Ëµ£¬t.lengthµÈÓÚ£¨ £©£¬t[0].lengthµÈÓÚ£¨ £©¡£ 7¡¢ÒÑÖªÊý×éaµÄ¶¨ÒåΪ¡±int a[]={1,2,3,4,5};¡±£¬Ôòa[2]=( )£¬Êý×ébµÄ¶¨ÒåΪ¡°int b[]=new int[5];¡±£¬Ôòb[2]=£¨ £©£¬Êý×écµÄ¶¨ÒåΪ¡°Object c[]=new Object[5];¡±£¬Ôòc[2]=( ); 8¡¢µ÷ÓÃÊý×éÔªËØÊ±£¬Ó㨠£©ºÍ£¨ £©À´Î¨Ò»È·¶¨Êý×éÖеÄÔªËØ¡£ 9¡¢Êý×éµÄ³õʼ»¯ÊÇ£¨ £©

10¡¢Êý×éÔªËØÍ¨¹ý£¨ £©À´·ÃÎÊ£¬Êý×éArrayµÄ³¤¶ÈΪ£¨ £© 11¡¢Êý×é¸´ÖÆÊ±£¬¡°=¡±½«Ò»¸öÊý×éµÄ£¨ £©´«µÝ¸øÁíÒ»¸öÊý×é¡£ 12¡¢JVM½«Êý×é´æ´¢ÔÚ£¨ £©ÖС£

13¡¢Êý×é¶þ·Ö·¨²éÕÒÔËÓõÄǰÌáÌõ¼þÊÇÊý×éÒѾ­£¨ £©¡£ 14¡¢Êý×é×îСϱêÊÇ£¨ £©¡£

15¡¢JavaÖÐÊý×éϱêµÄÊý¾ÝÀàÐÍÊÇ£¨ £©¡£ 16¡¢Óï¾ä¡°int a[]=new int[100]¡±µÄº¬ÒåÊÇ£¨ £©¡£

17¡¢Ö÷·½·¨main(String args[])µÄ²ÎÊý¡°String args[]¡±ÊÇÒ»¸ö£¨ £©Êý×é¡£ 18¡¢ÒÑÖªÊý×éa1Óëa2¶¨ÒåÈçÏ£º

int a1[] = {2,3,5,7,11,13}

int a2[] ={1001,1002,1003,1004,1005,1006,1007}

ÔÚÓï¾ä¡±System.arraycopy(a1,2,a2,3,4);¡±Ö´Ðкó£¬Êý×éa2µÄÖµÊÇ£¨ £©

¶þ¡¢ Ñ¡ÔñÌâ

1¡¢ÏÂÃæÄÄÖÖд·¨¿ÉÒÔʵÏÖ·ÃÎÊÊý×éarrµÄµÚ1¸öÔªËØ£¿£¨ £© A¡¢arr[0] B¡¢arr(0) C¡¢arr[1] D¡¢arr(1) 2¡¢ÒÔÏÂÄĸöÑ¡Ïî¿ÉÒÔÕýÈ·´´½¨Ò»¸ö³¤¶ÈΪ3µÄ¶þάÊý×飿£¨ £©

A¡¢new int[2][3] B¡¢new int[3][] C¡¢new int[][3] D¡¢ÒÔÉϴ𰸽Բ»¶Ô 3¡¢ÏÂÁйØÓÚÊý×éµÄ¶¨ÒåÐÎʽ£¬ÄÄЩÊÇ´íÎóµÄ£¿£¨ £©

A£®int[ ]c=new char[10]; B£®int[ ][3]=new int[2][ ]; C£®int[ ]a; a=new int; D£®char b[ ]; b=new char[80]; 4¡¢Ö´ÐÐString[] s=new String[10];Óï¾äºó£¬ÄÄЩ½áÂÛÊÇÕýÈ·µÄ£¿£¨ £©

A£®s[0] Ϊ δ¶¨Òå B£®s.length Ϊ10