java¹¹Ô캯Êý
java¹¹Ô캯Êý
ÆäÓï·¨¸ñʽÈçÏ£º
< modifiers> <class_name>([< argu_list>]) {[< statements>]}
×Ô¶¨Òå¹¹Ôì·½·¨£º·½·¨ÃûÓëÀàͬÃû£¬Ê××Öĸ´óд£¡Ã»Óзµ»ØÀàÐÍ¡£³ý´ËÖ®ÍâÆäËû¶¼¸úÆÕͨ·½·¨Ò»Ñù¡£
ĬÈϹ¹Ô캯Êý£ºÃ»ÓÐÐβÎûÓз½·¨Ì壡È磺public Person() {}
¶ÁÏÂÃæµÄÀý×Ó£¬Ìå»á¹¹Ô캯ÊýµÄÓ÷¨£º
public class MyDate {
private int day ;
private int month ;
private int year ;
public Mydate(int d, int m, int y) {
year = y;
month = m;
day = d;
}
public void display() {
System.out.println(year + " / " + month + " / " +day);
}
public static void main(String[] args) {
MyDate m;
m = new MyDate(22, 9, 2001);
m.display();
}
}
Êä³ö½á¹û£º2001 / 9 / 22
Ïà¹ØÎĵµ£º
javaÖÐÅжÏ×Ö·û´®ÊÇ·ñΪÊý×ÖµÄÈýÖÖ·½·¨
1>ÓÃJAVA×Ô´øµÄº¯Êý
public static boolean isNumeric(String str){
for (int i = str.length();--i>=0;){
if (!Character.isDigit(str.charAt(i))){
return false;
}
}
......
JavaÌṩÁËÒ»Ì×»úÖÆÀ´¶¯Ì¬Ö´Ðз½·¨ºÍ¹¹Ôì·½·¨£¬ÒÔ¼°Êý×é²Ù×÷µÈ£¬ÕâÌ×»úÖÆ¾Í½Ð——·´Éä¡£·´Éä»úÖÆÊÇÈç½ñºÜ¶àÁ÷Ðпò¼ÜµÄʵÏÖ»ù´¡£¬ÆäÖаüÀ¨Spring¡¢HibernateµÈ¡£ÔÀíÐÔµÄÎÊÌâ²»ÊDZ¾ÎĵÄÖØµã£¬½ÓÏÂÀ´ÈÃÎÒÃÇÔÚʵÀýÖÐѧϰÕâÌ×¾«²ÊµÄ»úÖÆ¡£
1. µÃµ½Ä³¸ö¶ÔÏóµÄÊôÐÔ
1 public Object getProperty(Objec ......
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ......
1¡¢Ê¹ÓÃMouseListener½è¿Ú´¦ÀíÊó±êʼþ
Êó±êʼþÓÐ5ÖÖ£º°´ÏÂÊó±ê¼ü£¬ÊÍ·ÅÊó±ê¼ü£¬µã»÷Êó±ê¼ü£¬Êó±ê½øÈëºÍÊó±êÍ˳ö
Êó±êʼþÀàÐÍÊÇMouseEvent£¬Ö÷Òª·½·¨ÓУº
getX(),getY() »ñÈ¡Êó±êλÖÃ
getModifiers() »ñÈ¡Êó±ê×ó¼ü»òÕßÓÒ¼ü
getClickCount() »ñÈ¡Êó±ê±»µã»÷µÄ´ÎÊý
getSource() »ñÈ¡Êó±ê·¢ÉúµÄʼþÔ´
ʼþÔ ......
1¡¢StringÊÇ×î»ù±¾µÄÊý¾ÝÀàÐÍÂð?
»ù±¾Êý¾ÝÀàÐͰüÀ¨byte¡¢int¡¢char¡¢long¡¢float¡¢double¡¢booleanºÍshort¡£
java.lang.StringÀàÊÇfinalÀàÐ͵ģ¬Òò´Ë²»¿ÉÒԼ̳ÐÕâ¸öÀà¡¢²»ÄÜÐÞ¸ÄÕâ¸öÀࡣΪÁËÌá¸ßЧÂʽÚÊ¡¿Õ¼ä£¬ÎÒÃÇÓ¦¸ÃÓÃStringBufferÀà
2¡¢int ºÍ Integer ÓÐÊ²Ã´Çø±ð
Java ÌṩÁ½ÖÖ²»Í¬µÄÀàÐÍ£ºÒýÓÃÀàÐͺÍÔʼÀàÐÍ£¨ ......