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public String makeStars(int size, char ch) {
    if(size < 1) {
        throw new IllegalArgumentException("size must be greater than 0");
    }
    char[] chs = new char[size];
    for(int i = 0; i < size; i++) {
        chs[i] = ch;
    }
    return new String(ch);
}


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javaʹÓÃrocksawºÍvserv tcpipʵÏÖ»ùÓÚICMPµÄPing¹¦ÄÜ

Ò»£º×¼±¸ www.savarese.org download
 1.  rocksaw-1.0.0-src.tar.gz
 2.  vserv-tcpip-0.9.2-src.tar.gz
¶þ£º±àÒëÔ´ÎļþµÃµ½jar°ü ʹÓÃAnt
 1.  build vserv-tcpip-0.9.2-src
      ÔÚvserv-tcpip-0.9.2Ŀ¼ÏÂÃæ½¨Ò»¸ötestsĿ¼£¬È»ºóÔÚcmd´°¿ÚϽøÈë ......

JPetStore 5.0(iBATIS for java)ÖÐItem.xmlµÄbug

Caused by: java.sql.SQLException: ORA-00918: column ambiguously defined
Caused by: com.ibatis.common.jdbc.exception.NestedSQLException:  
--- The error occurred in com/ibatis/jpetstore/persistence/sqlmapdao/sql/Item.xml. 
--- The error occurred while applying a parameter map.&nbs ......

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1.JavaÔÚÐéÄâ»úÉÏÔËÐР
JavaÔ´´úÂë²¢²»ÊDZ»±àÒë³ÉΪÆÕͨµÄ»úÆ÷´úÂë¡£¶øÊDZ»·­Òë³ÉΪÐéÄâ»ú¿ÉÒÔÖ´ÐеĴúÂë¡£Ò»¸öJava½âÊÍÆ÷×îÖÕÖ´ÐÐÕâЩ´úÂë¡£ÕâÆäÖÐûÓÐÁ¬½ÓµÄ¹ý³Ì£»½âÊÍÔÚÐèÒªµÄʱºò¶¯Ì¬µÄ¼ÓÔØÒ»Ð©Àࣻ 
2.JavaÊÇÍêÈ«ÃæÏò¶ÔÏóµÄ 
JavaÊÇÒ»ÖÖÍêÈ«ÃæÏò¶ÔÏóµÄÓïÑÔ¡£ÕâÒâζ×ÅÄã¶ÔÈκÎÒ»¸öJava¶ÔÏóËù×öµÄ¶ ......

javaµ÷ÓÃwindows API

ʹÓÃjinvokeµ÷ÓÃwindowsAPI¡£jnaʹÓñȽÏÂé·³£¬ÐèҪдc´úÂëºÍ²ÎÊýת»»£¬jinvokeµÄʹÓþÍÏñjdkÖеİüÒ»Ñù¡£
¹ÙÍøÊ¹Óòο¼£ºhttp://www.jinvoke.com/calling-the-win32-api-from-java
Ò»¸öµ¯³ö¿òµÄÀý×Ó£¨ÕâÖÖ´úÂëÓÃÓÚµ÷ÓÃÈκÎdll£¬²»Ö»ÊÇwindowsµÄ£¬Ò²¿ÉÒÔÊÇ×Ô¼ºÐ´µÄdll£©
import com.jinvoke.JInvoke;
import com.jinvok ......

java×ÀÃæ³ÌÐòÖ®Òþ²ØÊó±ê

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import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.image.MemoryImageSource;
import javax.swing.JFrame;
public class HideCursor extends JFrame {
 HideCursor() {
  this.setBounds(300, 300, 300, 300);
 &nb ......
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