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                   byte b1 = 10;
                   byte b2 = 20;
                   byte b3 = b1 + b2; //Óï·¨´íÎó£¬ÀàÐͲ»Æ¥Åä
                   int n = b1 + b2;    //»òÕß byte b3 = (byte)(b1 + b2);
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                   int n = -1;
                   boolean b1 = (n >= 0) && (n < 10);
                   boolean b2 = (n >= 0) & (n < 10);
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1.       Ëõ½øÅŰæ(Indentation)
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3.1    Ð㤶È(Line Length)
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package thread;
public class ThreadTest {

public static void main(String args[])
{
//new TestThread ().start();
TestThread tt= new TestThread();//´´½¨TestThreadÀàµÄÒ»¸öʵÀý
Thread t= new Thread(tt);//´´½¨Ò»¸öThreadÀàµÄʵÀý
t.start();//ʹÏ߳̽øÈëRunnable״̬
new Thread(tt).star ......

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java ´úÂë
import javax.xml.parsers.DocumentBuilder;   
import javax.xml.parsers.DocumentBuilderFactory;   
  
import org.w3c.dom.Document;   
import org.w3c.dom.Element;   
import org.w3c.dom.NodeList;    ......
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