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2.±éÀúHASHMAP
Iterator itr = map.keySet().itrator();
while(itr.hasNext())
{
    Object temp1 = itr.next();
    Object temp2 = tab.get(temp1);
}
3.ÈÕÀú²Ù×÷
Calendar c = Canlendar.getInstance();
c.get(c.YEAR);//»ñÈ¡Äê·Ý£¬ÆäËûͬÀí
c.add(c.MONTH,-1);//ÉϸöÔµÄÈÕÆÚ
 
4.Ëæ»úÊý
Random random = new Random();
int ran = random.nextInt(100);
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5.¶ÁÈ¡ÅäÖÃÎļþ
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Properties pro = new Properties();
//pro.load (Main.class.getResourceAsStream("/test.properties"));»òÕß
//pro.load (new FileInputStream ("test.properties"));
pro.getProperty ("test")
6.±éÀúvector
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//        for (Enumeration e = v.elements ();e.hasMoreElements ();)
//        {
//             System.out.println (e.nextElement ().toString ());
//        }    
       Iterator item = v.iterator ();
       while(item.hasNext ())
       {
           System.out.println (item.next ().toString ());
       }
7.JAVAÔÚWINDOWSϵ÷ÓÃÆäËû³ÌÐò
try
{
    Process p = Runtime.getRuntime().exec("mspaint");
    p.waitFor();
}catch ...
8.»ñÈ¡¼üÅÌÊäÈë
BufferedReader input = new BufferedReader(new InputStream(System.in));
String s = input.readLine();
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10.ÃüÁîÌáʾ·ûÏ£¬±àÒëjavaÎļþ ½¨ÒéʹÓÃ"javac -d . xxx.java" ÄÜ×Ô¶¯Éú³É³ÌÐòÖеİü¡£¶øÔËÐÐÖ»ÐèÒª"java packname.mainclass".
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int[][] a = new int[10][10];
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public static void main(String[] args) {
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