JAVA³£ÓÃÀàµÄʹÓ÷½·¨
JAVA³£ÓÃÀàµÄʹÓ÷½·¨
£±¡¢IntegerÀà
£²¡¢FloatÀà
£³¡¢DoubleÀà
£´¡¢CharacterÀà
£µ¡¢StringÀà
£¶¡¢StringTokenizerÀà
£·¡¢StringBufferÀà
£¸¡¢RandomÀà
1£®IntegerÀàµÄʹÓ÷½·¨
Interger£ºÕûÊýÀàÐÍ
£±¡¢ÊôÐÔ¡£
static int MAX_VALUE£º·µ»Ø×î´óµÄÕûÐÍÊý£»
static int MIN_VALUE£º·µ»Ø×îСµÄÕûÐÍÊý£»
static Class TYPE £º·µ»Øµ±Ç°ÀàÐÍ¡£
Àý×Ó£º
System.out.println("Integer.MAX_VALUE: " + Integer.MAX_VALUE );
½á¹ûΪ£ºInteger.MAX_VALUE: 2147483647
£²¡¢¹¹Ô캯Êý¡£
Integer(int value) £ºÍ¨¹ýÒ»¸öintµÄÀàÐ͹¹Ôì¶ÔÏó£»
Integer(String s) £ºÍ¨¹ýÒ»¸öStringµÄÀàÐ͹¹Ôì¶ÔÏó£»
Àý×Ó£º
Integer i = new Integer("1234");
Éú³ÉÁËÒ»¸öֵΪ1234µÄInteger¶ÔÏó¡£
£³¡¢·½·¨¡£
˵Ã÷£º
1. ËùÓз½·¨¾ùΪpublic£»
2. Êéд¸ñʽ£º£ÛÐÞÊηû£Ý¡¡<·µ»ØÀàÐÍ> <·½·¨Ãû£¨£Û²ÎÊýÁбí£Ý£©>
È磺
static int parseInt(String s) ±íʾ£º´Ë·½·¨£¨parseInt£©ÎªÀà·½·¨£¨static£©£¬·µ»ØÀàÐÍΪ£¨int£©£¬·½·¨ËùÐè²ÎÊýΪStringÀàÐÍ¡£
1. byteValue()£ºÈ¡µÃÓÃbyteÀàÐͱíʾµÄÕûÊý£»
2. int compareTo(Integer anotherInteger) £º±È½ÏÁ½¸öÕûÊý¡£ÏàµÈʱ·µ»Ø£°£»Ð¡ÓÚʱ·µ»Ø¸ºÊý£»´óÓÚʱ·µ»ØÕýÊý¡£
Àý×Ó£º
Integer i = new Integer(1234);
System.out.println("i.compareTo: " + i.compareTo(new Integer(123)) );
½á¹ûΪ£ºi.compareTo: 1
3. int compareTo(Object o) £º½«¸ÃÕûÊýÓëÆäËûÀà½øÐбȽϡ£Èç¹ûoҲΪIntegerÀ࣬½øÐз½·¨2 µÄ²Ù×÷£»·ñÔò£¬Å׳öClassCastExceptionÒì³£¡£
4. static Integer decode(String nm) £º½«×Ö·û´®×ª»»ÎªÕûÊý¡£
5. double doubleValue() £ºÈ¡µÃ¸ÃÕûÊýµÄË«¾«¶È±íʾ¡£
6. boolean equals(Object obj) £º±È½ÏÁ½¸ö¶ÔÏó¡£
7. float floatValue() £ºÈ¡µÃ¸ÃÕûÊýµÄ¸¡µãÊý±íʾ¡£
8. static Integer getInteger(String nm) £º¸ù¾ÝÖ¸¶¨ÃûÈ·¶¨ÏµÍ³ÌØÕ÷Öµ¡£
9. static Integer getInteger(String nm, int val) £ºÉÏÃæµÄÖØÔØ¡£
10. static Integer getInteger(String nm, Integer val) £ºÉÏÃæµÄÖØÔØ¡£
11. int hashCode() £º·µ»Ø¸ÃÕûÊýÀàÐ͵ĹþÏ£±íÂë¡£
12. int intValue() £º ·µ»Ø¸ÃÕûÐÍÊýËù±íʾµÄÕûÊý¡£
13. long longValue() £º·µ»Ø¸ÃÕûÐÍÊýËù±íʾµÄ³¤ÕûÊý¡£
14. static int parseInt(String s) £º½«×Ö·û´®×ª»»³ÉÕûÊý¡£s±ØÐëÊÇʱ½øÖÆÊý×é³É£¬·ñÔòÅ׳öNumberFormatExceptionÒì³£¡£
15. static int parseInt(S
Ïà¹ØÎĵµ£º
Hibernate¡¢TopLinkµÈOR Mapping²Ù×÷Êý¾Ý¿âµÄ¼¼Êõ¶¼Êǽ¨Á¢JDBC¼¼ÊõÖ®Éϵģ¬Êµ¼ÊÀ´Ëµ£¬ËûÃǵÄÐÔÄܺÍJDBCÊÇÓкܴó²î¾àµÄ£¬µ«·´¹ýÀ´Ëµ£¬Èç¹ûJDBCÓò»ºÃ£¬»¹²»Èç hibernateÄØ¡£ÔÝÇÒ²»ËµÕâЩÊëÓÅÊëÁӵϰÁË£¬ÔÙ´ÎÖ÷ÒªÊǶÔJavaµÄ»ù´¡¼¼Êõ×ö¸ö×ܽᣬÒÔ¼ÓÉîÈÏʶ¡£
Ò»¡¢JDBCµÄ»ù±¾ÔÀí
JDBCÊÇJava²Ù×÷Êý¾Ý¿âµÄ¼¼Êõ¹æ·¶¡£Ëûʵ ......
The Mean Opinion
Score (MOS) test is a well acccepted standard which is defined in the ITU-T
Rec.P.800.
The value of MOS
test is generated by letting large number of listeners to evaluate the quality
of the test sentences.
The test scores
are averaged to a mean score which range fro ......
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.huadoo.model.Area;
public class Aaaa {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
  ......
ʹÓÃBigInteger´óÈÝÁ¿ÔËËãÀà¼ÆËã100µÄ½×³Ë
Ò».Ò»°ãËã·¨(Ñ»·)
public class Test {
public static void main(String[] args) {
int result = 1;
for (int i = 1; i <= 100; i++) {
result *= i;
}
System.out.println(result);
}
}
Êä³ö½á¹ûΪ0£¬ÒòΪintÎÞ·¨±£´æÏÂ100µÄ½×³ËµÄ½á¹û£¬100µ ......
Java ÊÇÒ»ÃÅÖ§³Ö¶àÏ̵߳ĵÄÓïÑÔ£¬µ«ÔÚ´¦Àí¶àÏß³ÌʼþʱÎÒÃDZØÐë×¢ÒâÕâÑùÒ»¸öÎÊÌ⣺¶à¸öÏ߳̿ÉÄÜͬʱ¶Ôͬһ¶ÔÏóµÄÐ޸ġ£Èç¹ûÎÒÃDz»¼°Ê±×÷³ö´¦Àí£¬¿ÉÄÜÒýÆð¶ÔÏóÖµµÄ»ìÂÒ¡£Æäʵ´¦Àí°ì·¨Ò²ºÜ¼òµ¥£¬¾ÍÊǵ±Ò»¸öÏ̴߳¦ÀíÒ»¸ö¶ÔÏó£¬Ëø×¡¸Ã¶ÔÏó¡£ ......