java ÖеÄÏÝÚå¡£
¿´ÁËÒ»¶Î±±·çÍøµÄÊÓƵ£¬×ܽἸ¸ö¾µäµÄjavaÏÝÚå¸ø´ó¼Ò¡£
´ð°¸ÔÚ²©¿ÍÖУºhttp://blog.csdn.net/ol_beta/archive/2010/05/17/5598867.aspx
»¶Ó´ó¼ÒÌÖÂÛ£¡
1¡¢ÕÒÆæÊý£º
Java code
public static boolean isOdd(int i){
return i % 2 == 0;
}
ÉÏÃæµÄ·½·¨ÕæµÄÄÜÕÒµ½ËùÓеÄÆæÊýô£¿
2¡¢¸¡µãÊýÏë¼õ
Java code
System.out.println(2.0-1.9);
System.out.println(2.0-1.9);
ÉÏÃæ»á´òÓ¡0.1ô£¿
3¡¢½»»»
Java code
int x = 2010;
int y = 2012;
x^=y^=x^=y;
System.out.println("x= " + x + "; y= " + y);
x¡¢yµÄÖµºô»½ÁËô£¿
4¡¢×Ö·ûºÍ×Ö·û´®
Java code
System.out.println("H" + "a");
System.out.println('H' + 'a');
ÉÏÃæÁ½¸öÓï¾äÊä³ö½á¹ûÏàͬô£¿
5¡¢ÎÞÏÞÑ»·
Java code
public static final int END = Integer.MAX_VALUE;
public static final int START = END - 100;
public static void main(String[] args) {
int count = 0;
for (int i = START; i <= END; i++)
count++;
System.out.println(count);
}
ÉÏÃæ³ÌÐòÔËÐеĽá¹ûÊÇʲô£¿
6¡¢¼ÆÊýÆ÷ÎÊÌâ
Java code
int minutes = 0;
for (int ms = 0; ms < 60*60*1000; ms++)
if (ms % 60*1000 == 0)
minutes++;
System.out.println(minutes);
½á¹û¸úÄãÏëµÄÒ»Ñùô£¿
7¡¢µ½µ×·µ»Øʲô£¿
Java code
public static boolean decision() {
try {
return true;
} finally {
return false;
}
}
true£¿false£¿
8¡¢´íÎóÀï¾Û¼¯±éÀú
Java code
public static void main(String[] args) {
Vector v = new Vector();
v.add("one");
v.add("two");
v.add("three");
v.add("four");
Enumeration enume = v.elements();
while (enume.hasMoreElements()){
String s = (String) enume.nextElement();
if (s.equals("two"))
v.remove("two");
else{
System.out.println(s);
}
}
System.out.println("What's really there...");
enume = v.elements();
while (enume.hasMoreElements()){
String s = (String)
Ïà¹ØÎĵµ£º
GUIDÊÇÒ»¸ö128볤µÄÊý×Ö£¬Ò»°ãÓÃ16
½øÖƱíʾ¡£Ëã·¨µÄºËÐÄ˼ÏëÊǽáºÏ»úÆ÷µÄÍø¿¨¡¢µ±µØʱ¼ä¡¢Ò»¸öËæ¼´ÊýÀ´Éú³ÉGUID¡£´ÓÀíÂÛÉϽ²£¬Èç¹ûһ̨»úÆ÷ÿÃë²úÉú10000000¸öGUID£¬Ôò¿ÉÒÔ
±£Ö¤£¨¸ÅÂÊÒâÒåÉÏ£©3240Äê²»Öظ´¡£
UUIDÊÇ1.5ÖÐÐÂÔöµÄÒ»¸öÀ࣬ÔÚjava.utilÏ£¬ÓÃËü¿ÉÒÔ²úÉúÒ»¸öºÅ³ÆÈ«ÇòΨһµÄID
package
com.mytest;
im ......
1¡¢ÃæÏò¶ÔÏóµÄÌØÕ÷ÓÐÄÄЩ·½Ãæ
1.³éÏó£º
³éÏó¾ÍÊǺöÂÔÒ»¸öÖ÷ÌâÖÐÓ뵱ǰĿ±êÎ޹صÄÄÇЩ·½Ã棬ÒÔ±ã¸ü³ä·ÖµØ×¢ÒâÓ뵱ǰĿ±êÓйصķ½Ãæ¡£³éÏó²¢²»´òËãÁ˽âÈ«²¿ÎÊÌ⣬¶øÖ»ÊÇÑ¡ÔñÆäÖеÄÒ»²¿·Ö£¬ÔÝʱ²»Óò¿·Öϸ½Ú¡£³éÏó°üÀ¨Á½¸ö·½Ã棬һÊǹý³Ì³éÏ󣬶þÊÇÊý¾Ý³éÏó¡£
2.¼Ì³Ð£º
¼Ì³ÐÊÇÒ»ÖÖÁª½áÀàµÄ²ã´ÎÄ£ÐÍ£¬²¢ÇÒÔÊÐíºÍ¹ÄÀøÀàµÄÖØ ......
ºÜ¿ÉÄܽ« Groovy µ±³ÉÊÇûÓйæÔòµÄ Java ´úÂë¡£µ«Êµ¼ÊÉÏ£¬Groovy Ö»ÊǹæÔòÉÙһЩ¡£ÕâÒ»½ÚµÄÖصãÊÇʹÓà Groovy ±àд Java Ó¦ÓóÌÐòʱ¿ÉÒÔ²»Óÿ¼ÂǵÄÒ»¸ö Java ±à³ÌµÄ¾ßÌå·½Ã棺ÀàÐͶ¨Òå¡£
ΪʲôҪÓÐÀàÐͶ¨Ò壿
ÔÚ Java ÖУ¬Èç¹ûÒªÉùÃ÷Ò»¸ö String ±äÁ¿£¬Ôò±ØÐëÊäÈ룺
String value = "Hello World";
µ«ÊÇ£¬Èç¹û×ÐϸÏëÏ ......
Throwable
Throwable ÀàÊÇ Java ÓïÑÔÖÐËùÓдíÎó»òÒì³£µÄ³¬Àà¡£Ö»Ó屶ÔÏóÊÇ´ËÀࣨ»òÆä×ÓÀàÖ®Ò»£©µÄʵÀýʱ£¬²ÅÄÜͨ¹ý Java ÐéÄâ»ú»òÕß Java throw Óï¾äÅ׳ö¡£ÀàËƵأ¬Ö»ÓдËÀà»òÆä×ÓÀàÖ®Ò»²Å¿ÉÒÔÊÇ catch ×Ó¾äÖеIJÎÊýÀàÐÍ¡£
Á½¸ö×ÓÀàµÄʵÀý£¬Error ºÍ Exception£¬Í¨³£ÓÃÓÚָʾ·¢ÉúÁËÒì³£Çé¿ö¡£Í¨³££¬ÕâЩʵÀýÊÇÔÚÒì³£Çé ......