Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

java±ÊÊÔÌâ×ܽáÓë´ó¼Ò·ÖÏí

javaÊÔÌâ
http://202.201.112.11/jpk/apply/teacher/preface/53/test123/test3/exam.htm
1.½Ó¿ÚÖз½·¨µÄÇ°ÃæÓÐÄÄЩÐÞÊηû
 ·ÃÎÊȨÏÞ ·µ»ØÖµÀàÐÍ ÊÇ·ñ¾²Ì¬ ÊÇ·ñ³éÏó
2.ÒÔÏÂÄĸöÎªÕæ
  Interger a = new Interger(9);
  Interger b = new Interger(9);
  Long c = New Long(9)
-----
  A.  a==b
  B.  b==c
  C.  a.equals(b)
  D.  b.equals(new Interger(9))
cd
3.ÒÔÏÂÄÄÁ½¸ö·½·¨¿ÉÒÔ¼Óµ½threeÖÐ
  class one{
    public one foo(){return this;}
}
  class two extends one{
    public one foo(){return this;}
}
  class three extends two{
  //²åÈëµ½Õâ
}
---
  A.  public void foo(){}
  B.  public int foo(){return 1;}
  C.  public one foo(){return this;}
  d.  public two foo(){return this;}
  e.  public object foo(){return this;}
cd
4.ÒÔÏÂÄÄЩΪtrue
  class a{}
  class b extends a{}
  class c extends a{}
  a p0=new a();
  b p1=new b();
  c p2=new c();
  a p3=new b();
  a p4=new c();
----
  A.  p1 = (b)p2
  B.  p3 = (a)p4
  C.  p3 = (b)p4
  d.  p0 = (a)p1
bcd
5. ÒÔÏÂÓÐÎÞÎÊÌâ
abstract class a{
    public void fo(){ system.out.println("a");}
}
ÎÞ  ³éÏóÀà¿ÉÒÔÓзdzéÏó·½·¨
6. ÒÔÏÂÓÐÎÞÎÊÌâ
abstract class b{
    static void f1(){ system.out.println("f1");}
    public static void main(String[] args){
          b b1=new b(); //³éÏóÀ಻ÄÜÓÐʵÀý
          b1.f1();
    }
}
7. ÒÔÏ´úÂëÔËÐнá¹ûÊÇ
  try{
      //´ËÐлáÅ׳öNullPointedException
  }
  catch(NullPointedExecption e){
      System.out.print("1")
  }
  catch(RuntimeExection e){


Ïà¹ØÎĵµ£º

Javaѧϰ֮· The Road Of Java Study¡¶×ª¡·

Javaѧϰ֮· --The Road Of Java Study
JAVAÊÇÒ»ÖÖÆ½Ì¨£¬Ò²ÊÇÒ»ÖÖ³ÌÐòÉè¼ÆÓïÑÔ£¬ÈçºÎѧºÃ³ÌÐòÉè¼Æ²»½ö½öÊÊÓÃÓÚJAVA£¬¶ÔC++µÈÆäËû³ÌÐòÉè¼ÆÓïÑÔÒ²Ò»Ñù¹ÜÓá£Óбà³Ì¸ßÊÖÈÏΪ£¬JAVAÒ²ºÃCÒ²ºÃûʲô·Ö±ð£¬ÄÃÀ´¾ÍÓá£ÎªÊ²Ã´ËûÃÇÄÜ´ïµ½Èç´Ë¾³½ç£¿ÎÒÏëÊÇÒòΪ±à³ÌÓïÑÔÖ®¼äÓй²Í¨Ö®´¦£¬Áì»áÁ˱à³ÌµÄ¾«Ë裬×ÔÈ»Äܹ»×öµ½Ò»Í¨°Ùͨ¡£Èçº ......

JAVA·´Éä»úÖÆµÄѧϰ

 
JAVAÓïÑÔÖеķ´Éä»úÖÆ£º
    ÔÚJava ÔËÐÐʱ»·¾³(JRE)ÖУ¬¶ÔÓÚÈÎÒâÒ»¸öÀ࣬ÄÜ·ñÖªµÀÕâ¸öÀàÓÐÄÄЩÊôÐԺͷ½·¨£¿
    ¶ÔÓÚÈÎÒâÒ»¸ö¶ÔÏó£¬ÄÜ·ñµ÷ÓÃËûµÄ·½·¨£¿ÕâЩ´ð°¸Êǿ϶¨µÄ£¬ÕâÖÖ¶¯Ì¬»ñÈ¡ÀàµÄÐÅÏ¢£¬ÒÔ¼°¶¯Ì¬µ÷ÓÃÀàµÄ·½·¨µÄ¹¦ÄÜÀ´Ô´ÓÚJAVAµÄ·´Éä¡£´Ó¶øÊ¹java¾ßÓж¯Ì¬ÓïÑÔµÄÌØÐÔ¡£
&n ......

java int תΪstringµÄÈýÖÖ·½·¨


JAVAÖÐ int ÀàÐÍҪת»¯³É String ÀàÐÍ£¬¿ÉÒÔÓÐÈýÖÖ·½Ê½£¬·Ö±ðÊÇ£º
(1) String.valueOf(i) 
 (2) Integer.toString(i) 
(3) i+""
ÆäÖУºµÚ¶þÖÖÊÇЧÂÊ×î¸ßµÄ£¬ºÄʱÊÇÆäËûÁ½ÖÖµÄÒ»°ë¡£
String.valueOf(i)£º891
Integer.toString(i)£º468
i+""£º844
......

³õѧjava´ÓÕâÀ↑ʼ

ÕâÊÇÎÒ¸öÈ˹éÄɵÄһЩ֪ʶµã£¬ÎÒ¾õµÃ³õѧjavaÊ×ÏÈÐèÒªÖØÒÔϵÄ֪ʶ¿ªÊ¼
(1)JAVA³ÌÐò¿ª·¢²½Ö裺
   Ô´´úÂë-->±àÒë³É*.class-->Ö´ÐÐ(½«.class½»¸øJVM)
   jvm--javaÐéÄâ»ú£¨½âÊÍÆ÷£©
(2)
   JDK -- java¿ª·¢¹¤¾ß°ü(±àÒëÆ÷¡¢½âÊÍÆ÷¡¢Àà¿â)
   JSDK -- java±ê×¼¿ª·¢¹¤¾ß°ü ......

Cavaj Java Decompiler ·´±àÒëÆ÷

Cavaj Java Decompiler is a graphical freeware utility that reconstructs Java source code from CLASS files. You can decompile Java applets, JAR and ZIP files, producing accurate Java source code. Browse the reconstructed source code with the Class View for instant access to methods and fields. The pr ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ