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  . ÕýÈ·µÄ¶¨Òå: int num[];   num= new int[5]       //Ö»ÓÐÓÃnew¹Ø¼ü×ÖÕæÕý´´½¨Êý×éʱ²Å¿ÉÒÔ¸ø¶¨ËüµÄ´óС
    ´íÎóµÄ¶¨Òå: int num[5];
  . ³£¼ûµÄÊý×é´íÎóΪ : ArrayIndexOutOfBoundsException  (Êý×éÔ½½ç´íÎó)
  . Êý×éµÄά¶ÈÓà .length;  ×Ö·û´®³¤¶ÈÓà .length();
  . ÕýÈ·µÄ³õʼ»¯: int[] num={1,2,3}; ÓÖ»òÕß: int num[]= new int[]{1,2,3}
    ´íÎóµÄ³õʼ»¯: int[] num=new int[3]{1,2,3};
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  . JavaÑϸñÇø·Ö´óСд.
  . Ò»¸öÍⲿÀàÖ»ÔÊÐíÉùÃ÷Ϊpublic, abstact , final.
  . System.out.print ÊÇstatic·½·¨, ²»ÐèÒªnew´´½¨.
  . Static·½·¨Ö»ÄÜ·ÃÎÊStatic±äÁ¿
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    Protected : ÔÚÀà×ÔÉí, ×ÓÀà, ͬһ¸ö°üÄÚ²¿¿É¼û
  . Static  : ¿ÉÒÔÓ¦ÓÃÓÚÄÚ²¿Àà,·½·¨, ±äÁ¿.
                 ±êÖ¾Ò»¸ö±äÁ¿Îªstatic, ±íʾÆäÖ»ÄÜÓÐÒ»¸ö¸±±¾´æÔÚ.
                 Ò»¸östatic·½·¨,²»ÄÜÔÚÒ»¸ö×ÓÀàÖÐÖØдΪ·Çstatic·½·¨. (´Ë¹æÔò¶Ô·½·¨µÄÖØÔز»Æð×÷ÓÃ)
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 . native  : ½öÐÞÊη½·¨, Ö¸Ã÷´úÂëÌå²»ÊÇÓÃjava¶øÊÇÓÃc»òÒÔc++Ëùд
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Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); 
String url="jdbc:oracle:thin:@localhost:1521:orcl"; //orclΪÊý¾Ý¿âµÄSID 
String user="test"; 
String password="test"; 
Connection conn= Dri ......

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public static boolean telnetTest() {
boolean b=false;
Socket server = null;
try {
server = new Socket();
InetSocketAddress address = new InetSocketAddress(
"192.168.1.101", 80);
server.connect(address, 5000);
b=true;
} catch (UnknownHostException e) {
e.printSta ......

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