javaÖÐɾ³ýÎļþÀÏʧ°ÜµÄ½â¾ö°ì·¨
¸Õ²ÅÔÚ×ö¸ö²âÊÔʱ ɾ³ýÎļþÀÏÊÇʧ°Ü...Ò»Ö±ÕÒ²»µ½ÔÒò.. file.delete();
×ÜÊÇ·µ»Øfalse.
ÔÚÍøÉÏÕÒÁ˰ëÌì ¶¼ÕÒ²»µ½´íÔÚÄĶù..
if(file.exists() && file.canWrite())
file.delete();
ÕâÑù¶¼²»ÐС
ºóÀ´Í»È»Í»È»Ïëµ½´íÔÚÄĶùÁË..
¾ÍÊÇÔÚдÍêÎļþºóûÓÐclose
out.write(b);
out.flush();
out.close();
file.delete();
ÕâÑù¾Í¿ÉÒÔÁË...
Ïà¹ØÎĵµ£º
package graphic;
import javax.swing.ImageIcon;
import javax.swing.JTree;
import java.awt.Component;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultMutableTreeNode;
/**
*
* @author bianzhiqi
* ¾ßÌå·½·¨µÄʹÓò鿴DefaultTreeCellRendererµÄÎĵµ
*/
public c ......
import java.awt.*;
import java.awt.event.*;
public class TestFrame {
Frame fm = new Frame();
public void init(){
fm.setSize(300,300);
Button btn = new Button("ok");
fm.add(btn);
btn.addActionListener(ne ......
³õ̽javaÄÚ´æ»úÖÆ_¶ÑºÍÕ»
ÎÊÌâµÄÒýÈ룺
ÎÊÌâÒ»£º
String str1 = "abc";
String str2 = "abc";
System.out.println(str1==str2); //true
ÎÊÌâ¶þ£º
String str1 =new String ("abc");
String str2 =new String ("abc");
System.out.println(str1==str2); // false
ÎÊÌâÈý£º
String s1 = "ja";
String s2 = "v ......
JDK1.5ÖеÄÏ̳߳Ø(java.util.concurrent.ThreadPoolExecut
6
ÍÆ¼ö
ÔÚ¶àÏ̴߳óʦDoug LeaµÄ¹±Ï×Ï£¬ÔÚJDK1.5ÖмÓÈëÁËÐí¶à¶Ô²¢·¢ÌØÐÔµÄÖ§³Ö£¬ÀýÈ磺Ï̳߳ء£
Ò»¡¢¼ò½é
Ï̳߳ØÀàΪ java.util.concurrent.ThreadPoolExecutor£¬³£Óù¹Ôì·½·¨Îª£º
ThreadPoolExecutor(int corePoolSize, int maximumPoolSize,
long keepA ......
Ëæ×ŶàºË CPU µÄÈÕÒæÆÕ¼°£¬Ô½À´Ô½¶àµÄ Java Ó¦ÓóÌÐòʹÓöàÏ̲߳¢ÐмÆËãÀ´³ä·Ö·¢»ÓÕû¸öϵͳµÄÐÔÄÜ¡£¶àÏ̵߳ÄʹÓÃÒ²¸øÓ¦ÓóÌÐò¿ª·¢ÈËÔ±´øÀ´Á˾޴óµÄÌôÕ½£¬²»ÕýÈ·µØÊ¹ÓöàÏ߳̿ÉÄÜÔì³ÉÏß³ÌËÀËø»ò×ÊÔ´¾ºÕù£¬µ¼ÖÂϵͳ̱»¾¡£Òò´Ë£¬ÐèÒªÒ»ÖÖÔËÐÐʱÏß³Ì¼à¿Ø¹¤¾ßÀ´°ïÖú¿ª·¢ÈËÔ±Õï¶ÏºÍ¸ú×Ù Java Ïß³Ì״̬µÄÇл»¡£JDK 1.5 ¼°ÆäºóÐø°æ± ......