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12.ÔÚʹÓÃinterfaceÉùÃ÷Ò»¸ö½Ó¿Úʱ£¬Ö»¿ÉÒÔʹÓÃ____ÐÞÊηûÐÞÊθýӿڡ££¨ D £© A¡¢private B¡¢protected C¡¢private protected D¡¢public

13.ÏÂÁдúÂëµÄÊä³ö½á¹ûÊÇ £º £¨ A £© class Parent{ void printMe() {

System.out.println(\ } }£»

class Child extends Parent { void printMe() {

System.out.println(\ }

void printall() { super.printMe(); this.printMe(); printMe(); } }

public class Test_this {

public static void main(String args[]) { Child myC=new Child(); myC.printall(); } }

A¡¢parent child child B¡¢parent child parent C¡¢parent child D¡¢±àÒë´íÎó

14.Ϊ¶ÁÈ¡µÄÄÚÈݽøÐд¦ÀíºóÔÙÊä³ö£¬ÐèҪʹÓÃÏÂÁÐÄÄÖÖÁ÷£¿A¡¢File stream B¡¢Pipe stream C¡¢Random stream

) (D D¡¢Filter stream

15.ΪʵÏÖ¶àÏß³ÌÖ®¼äµÄͨÐÅ£¬ÐèҪʹÓÃÏÂÁÐÄÄÖÖÁ÷²ÅºÏÊÊ£¿( D ) A¡¢Filter stream B¡¢File stream

C¡¢Random access stream D¡¢Piped stream

16.SwingÓëaWTµÄÇø±ð²»°üÀ¨ £º£¨ D £© A¡¢SwingÊÇÓÉ´¿JavaʵÏÖµÄÇáÁ¿¼¶¹¹¼þ B¡¢SwingûÓб¾µØ´úÂë C¡¢Swing²»ÒÀÀµ²Ù×÷ϵͳµÄÖ§³Ö D¡¢SwingÖ§³ÖͼÐÎÓû§½çÃæ

17.ÔÚ±àдJava applet³ÌÐòʱ£¬ÈôÐèÒª¶Ô·¢Éúʼþ×÷³öÏìÓ¦ºÍ´¦Àí£¬Ò»°ãÐèÒªÔÚ³ÌÐòµÄ ¿ªÍ·Ð´ÉÏ____Óï¾ä¡£ £¨D £© A¡¢import java.awt.*; B¡¢import java.applet.*; C¡¢import java.io.*; D¡¢import java.awt.event.*;

18.×¢Ê͵Ļù±¾Ô­Ôò²»°üÀ¨£º£¨ D £© A¡¢×¢ÊÍÓ¦¸ÃÔö¼Ó´úÂëµÄÇåÎú¶È B¡¢×¢ÊÍÒª¼ò½à C¡¢ÔÚд´úÂë֮ǰдעÊÍ D¡¢¾¡Á¿¸øÃ¿Ò»ÌõÓï¾ä¼Ó×¢ÊÍ

19.java.io°üÖж¨ÒåÁ˶à¸öÁ÷ÀàÐÍÀ´ÊµÏÖÊäÈëºÍÊä³ö¹¦ÄÜ£¬¿ÉÒÔ´Ó²»Í¬µÄ½Ç¶È¶ÔÆä½øÐзÖÀà,°´¹¦ÄÜ·ÖΪ£º£¨A¡¢ÊäÈëÁ÷ºÍÊä³öÁ÷ £¨·½Ïò£© B¡¢×Ö½ÚÁ÷ºÍ×Ö·ûÁ÷ £¨ÄÚÈÝ£© C¡¢½ÚµãÁ÷ºÍ´¦ÀíÁ÷ £¨·Ö¹¤£© 20. ÒÔϳÌÐòµÄÔËÐнá¹ûΪ£¨ B £© public class IfTest{

public static void main(String args[]){ int x=3; int y=1; if(x==y)

System.out.println(\else

System.out.println(\} }

A£©Not equal B£©Equal C£©ÎÞÊä³ö D£©±àÒë³ö´í

¶þ£®Ìî¿ÕÌ⣨ÿ¿Õ1.5·Ö£¬¹²15·Ö£©

C £© 1.java.io°üÖеÄ_ObjectInputStream__________ºÍ_ObjectOutputStream________ÀàÖ÷ÒªÓÃÓÚ¶Ô¶ÔÏó(Object)µÄ¶Áд¡££¨serializable£©

2.ÔÚ±àдÒì³£´¦ÀíµÄJava³ÌÐòÖУ¬Ã¿¸öcatchÓï¾ä¿é¶¼Ó¦¸ÃÓë__try_____Óï¾ä¿é¶ÔÓ¦£¬Ê¹µÃÓøÃÓï¾ä¿éÀ´Æô¶¯JavaµÄÒì³£´¦Àí»úÖÆ¡£ 3. ˳ÐòÖ´ÐÐÒÔÏÂÁ½¸öÓï¾äµÄÊä³ö½á¹ûÊÇ£º10____¡£ String s=\ÎÒϲ»¶Ñ§Ï°Java£¡\System.out.println(s.length());

4. JavaÓïÑÔͨ¹ý½Ó¿ÚÖ§³Ö_¶àÖØ___¼Ì³Ð£¬Ê¹Àà¼Ì³Ð¾ßÓиüÁé»îµÄÀ©Õ¹ÐÔ¡£ 5. ʵÀý»¯¶ÔÏ󣺾ÍÊÇ´´½¨Ò»¸ö¶ÔÏó¡£ÓÃ__new_____ÔËËã·ûÀ´ÊµÏÖ¶ÔÏóµÄʵÀý»¯¡£

6.ÎÒÃÇÓÃ_int______À´¶¨ÒåÒ»¸öÕûÊý£¬ÓÃ__char____À´¶¨ÒåÒ»¸ö×Ö·ûÀàÐÍ£¬³ÆÎªÔ­Ê¼Êý¾ÝÀàÐÍ¡£

7. µ±Óû§ÔÚTextFieldÖÐÊäÈëÒ»ÐÐÎÄ×ֺ󣬰´»Ø³µ£¬ÊµÏÖ__ ActionListner_______½Ó¿Ú¿ÉʵÏÖ¶ÔʼþµÄÏìÓ¦¡£ 8. °üº¬Swing¹¹¼þµÄApplet£¨Ð¡Ó¦ÓóÌÐò£©Ó¦¸ÃÊÇ__Applet____ÀàµÄ×ÓÀà¡£ Èý¡¢Ð´³öÏÂÁгÌÐòµÄÔËÐнá¹û£¨Ã¿¿Õ5·Ö£¬¹²15·Ö£© 1£®ÏÂÁгÌÐòµÄÊä³ö½á¹ûΪ£º public class TestApple { int i=0; Apple(int i){ this.i=i; }

Apple increament(){ i++; return this; }

void print(){

System.out.println(\ }

public static void main(String[] args) { Apple redapple=new Apple(1000);

redapple.increament().increament().print(); } i=1002 2. ÏÂÁгÌÐòµÄÊä³ö½á¹ûΪ£º class SuperClass{

private int n; SuperClass(){

System.out.println(\ }

SuperClass(int n){

System.out.println(\ } }

class SubClass extends SuperClass{

private int n; SubClass(int n){ super();

System.out.println(\ this.n=n; }

SubClass(){

super(300);

System.out.println(\ } }

public class TestSuperSub {

public static void main(String args[]){ SubClass sc=new SubClass(400); }

} ½á¹û£ºSuperClass() SubClass(400)

˵Ã÷¶ÔÏóÏȵ÷ÓÃSubClassµÄÓвι¹Ô캯Êý£¬½Ó×ŵ÷ÓÃSuper()µÄÎ޲ι¹Ô캯Êý£¬Êä³öSuperClass() £¬½Ó×ÅÊä³öSubClass(400) 3. ÏÂÁгÌÐòµÄÊä³ö½á¹ûΪ£º class FatherClass{

public int value; public void f(){

value=100;

System.out.println(\ } }

class ChildClass extends FatherClass{ public int value; public void f(){

super.f(); value=200;

System.out.println(\ System.out.println(value); System.out.println(super.value); } }

public class TestInherit {

public static void main(String[] args) { ChildClass cc=new ChildClass(); cc.f(); }

} FatherClass.value=100 ChildClass value=200 200 100 ËÄ¡¢³ÌÐòÉè¼Æ£¨Ã¿Ìâ10·Ö£¬¹²30·Ö£©

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1. ObjectInputStream ObjectOutputSteam 2. Try 3. 10 4. ¶àÖØ 5. new 6. Int,char 7. ActionListner 8. Applet

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