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1¡¢ÏÂÃæµÄÄÄЩ³ÌÐòƬ¶Ï¿ÉÄܵ¼Ö´íÎó£¿
A¡¢ String s=¡±Gone with the wind¡±;
String t=¡±good¡±;
String k=s+t;
B¡¢ String s=¡±Gone with the wind¡±;
String t;
t=s[3]+¡±one¡±;
C¡¢ String s=¡±Gone with the wind¡±;
String standard=s.toUpperCase();
D¡¢ String s=¡±home directory¡±;
String t=s-¡°directory¡±;
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2¡¢ÔÚ//point x´¦µÄÄÄЩÉêÃ÷ÊǾ䷨ÉϺϷ¨µÄ£¿
Class Person {
Private int a;
Public int change(int m){return m;}
}
public class Teacher extends Person {
public int b;
public static void main(String arg[]){
Person p=new Person();
Teacher t=new Teacher();
Int I;
//point x
}
}
A¡¢ i=m;
B¡¢ i=b;
C¡¢ i=p.a;
D¡¢ i=p.change(30);
E¡¢ i=t.b;
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3¡¢ÏÂÃæ¹ØÓڼ̳еÄÄÄЩÐðÊöÊÇÕýÈ·µÄ£¿
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B¡¢ ÔÚjavaÖÐÒ»¸öÀàÖ»ÄÜʵÏÖÒ»¸ö½Ó¿Ú
C¡¢ ÔÚjavaÖÐÒ»¸öÀ಻ÄÜͬʱ¼Ì³ÐÒ»¸öÀàºÍʵÏÖÒ»¸ö½Ó¿Ú¡£
D¡¢ javaµÄµ¥Ò»¼Ì³Ðʹ´úÂë¸ü¿É¿¿¡£
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4¡¢ÄǸöÐðÊöÊǶԵģ¿
Public class Person{
static int arr[]=new int[10];
public Static void main(String a[]){
System out println(arr[1]);
}
}
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C¡¢ Êä³öΪ0¡£
D¡¢ Êä³öΪnull
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5¡¢ÏÂÃæµÄÄÄЩÉùÃ÷ÊǺϷ¨µÄ£¿
A£®long 1=4990;
B int i=4L;
C. float f=1.1;
D. double d=34.4;
E. double t=0.9F;
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B£®1000ºÁÃë²»µ½
C£®>=1000ms
D£®²»Ò»¶¨,¿ÉÄÜ>1000ms¿ÉÄÜ<1000ms
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7¡¢¶ÔÓÚimport java.util.Vector ÒÔÏÂ˵·¨ÊÇ´íÎóµÄ
A£®VectorÊôÓÚ java.util°ü
B£®Vector·ÅÔÚ../java/utilĿ¼ÏÂ
C£®Vector·ÅÔÚjava.utilÎļþÀà
D£®VectorÊÇsun¹«Ë¾µÄ²úÆ·
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A£®Ò»µ©Ò»¸ö¶ÔÏó³ÉΪÀ¬»ø,Á¢¼´±»»ØÊÕµô
B£®¶ÔÏó¿Õ¼ä±»ÊÕ¼¯µôÖ®ºó,»áµ÷ÓøöÔÏóµÄfinalize()·½·¨
C£®Finalize()ºÍC++µÄÎö¹»º¯ÊýÊÇÒ»»ØÊÂ
D£®Ò»¸ö¶ÔÏó³ÉΪÀ¬»øÊÇÒòΪ²»ÔÙÓÐÒýÓÃÖ¸ÏòËü,µ«ÊÇÏ̲߳¢·ÇÈç´Ë
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C£®ÔÚcatch×Ó¾äÖÐÆ¥ÅäÒì³£ÊÇÒ»Öо«È·Æ¥Åä
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10¡¢Ê¹ÓÃÏÂÁз½·¨£¨£©£¬Äܹ»°Ñ¡°ep¡±Õâ¸öJButtonÀà¶ÔÏóÌí¼Óµ½JFrame¶ÔÏó¡°frm¡±µÄµ±Ç°ÄÚÈÝ´°¸ñµÄÖÐÐÄ¡£
A£®frm.getContentPane().add(ep, BorderLayout.CENTER)
B£®frm.add(ep.¡±Center¡±).getContentPane()
C£®frm.getContentPane().add(BorderLayout.CENTER, ep)
D£®frm.getContentPane(),add£¨¡±ep¡±,Center£©
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11¡¢ÀûÓÃÏÂÁй¹Ô캯Êý×¼±¸¶ÔÎļþabc.txt²Ù×÷£¬µ«Îļþabc.txtÔÚµ±Ç°Ä¿Â¼²»´æÔÚ£¬²»»á²úÉúÔËÐÐʱ´íÎóµÄÊÇ£º
A£®BufferedReader breader=new BufferedReader(
new FileReader(¡°abc.txt¡±));
B£®PrintWriter out = new PrintWriter(
new FileWriter(¡°abc.txt¡±),true);
C£®FileInputStream fin = new FileInputStream(¡°abc.txt¡±);
D£®OutputStreamWriter out= new OutputStreamWriter(
new FileOutputStream(¡°abc.txt¡±));
´ð°¸:[ B ]
12¡¢ÔÚJavaÓïÑÔÖУ¬ÀàWorkerÊÇÀàPersonµÄ×ÓÀ࣬WorkerµÄ¹¹Ôì·½·¨ÖÐÓÐÒ»¾ä¡°super()¡±£¬¸ÃÓï¾ä£¨£©¡£
A£®µ÷ÓÃÀàWorkerÖж¨ÒåµÄsuper()·½·¨
B£®µ÷ÓÃÀàPersonÖж¨ÒåµÄsuper()·½·¨
C£®µ÷ÓÃÀàPersonµÄ¹¹Ôì·½·¨
D£®Óï·¨´íÎó
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13¡¢ÏÂÃæJAVA´úÂë±àÒëÔËÐкó£¬ÏÂÁÐÑ¡ÏîÖУ¬£¨£©»á³öÏÖÔÚÊä³ö½á¹ûÖС£
public class test3£û
public static void main(string args[ ]) £û
for (int i=0;i<3; i ++)£û
for(int j=3;j >=0;j¨C)£û
if(i= =j)
continue;
system.out.printin(¡°i=¡±+i+¡°j¡±=+j);
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A£®i =0 j=3
B£®i =0 j=0
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14¡¢ÔÚjava ÖУ¬ÏÂÁдúÂë¶ÎÔÊÐí°´Å¥×¢²áÒ»¸öactionʼþµÄÊÇ£¨£©
A£®button.enableActionEvents()
B£®button.addActionListener(anActionListener)
C£®button.enableEvents(true)
D£®button.enableEvents(AWTEvent.ACTION_EVENT_MASK)
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15¡¢±àÒëÖ´ÐÐÏÂÁÐJAVA´úÂëºóÔÚ±ê×¼Êä³öÉÏ´òÓ¡³ö£º
public class ShortCkt£û
public static void main(String args[])£û
int counter=0;
boolean t=true;
boolean f=false;
boolean b=false;
b=(t&&((counter++)==0));
b=(f&&((counter+=2)>0));
System.out.println(counter);
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16¡¢ÔÚjava ÓïÑÔÖУ¬Èç¹ûÄãÓÐÏÂÃæµÄÀඨÒ壺
abstract class Shape{
abstract void draw();
}
class Square extends Shape{}.
A£®Ò»Çгɹ¦±àÒë
B£®Shape¿ÉÒÔ±àÒ룬Square²»ÄܱàÒë
C£®Square¿ÉÒÔ±àÒ룬Shape²»ÄܱàÒë
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