£®ArrayListÓëVectorÔÚ´ÓÖ¸¶¨Î»ÖÃÓÃindex¼ìË÷Ò»¸öÔªËصÄʱºò£¬Ê±¼ä¿ªÏúÊÇO(1)
C£®LinkedListÔÚ²åÈ롢ɾ³ýÈÎÒâλÖÃÔªËصÄʱ¼ä¿ªÏú¶¼ÊÇO(1)£¬µ«ËüÔÚË÷ÒýÒ»¸öÔªËصÄʱºò±È½ÏÂý£¬ÎªO(i)£¬ÆäÖÐiÊÇË÷ÒýµÄλÖá£
D£®µ±ÏòÕ⼸ÖÖÀàÐÍÖÐÔö¼ÓÔªËØʱ£¬Èç¹ûÊýÄ¿³¬³öÁËÆäÄ¿Ç°µÄ³¤¶È£¬VectorȱʡÇé¿öÏÂ×Ô¶¯Ôö³¤ÔÀ´Ò»±¶µÄ³¤¶È£¬¶øArrayListÓëLinkedListÔòÔö³¤50%µÄ³¤¶È¡£
5£®ÔÚJ2EEÖУ¬JSP¿ÉÒÔʹÓÃÏÂÁÐÄÄЩ¼¼Êõ¶Ô¿Í»§¶Ë»á»°×´Ì¬½øÐиú×Ù__________
A£®½¨Á¢ÄäÃûµÄ±í¸ñ×Ö¶Î
B£®Ê¹ÓÃURLÖØд
C£®Ê¹Óó־û¯Cookies
D£®Ê¹ÓÃsession»á»°»úÖÆ
Èý¡¢ Ìî¿ÕÌ⣨¹²5Ì⣬ÿÌâ3·Ö£¬¹²15·Ö£©
1£®ÏÂÃæ³ÌÐòµÄÔËÐнá¹ûΪ_________
public class Test{
public static void main(String[] args){
B obj = new B();
}
}
class A{
static {System.out.print(¡°X¡±);}
public A(){System.out.print(¡°A¡±);}
}
class B extends A{
static {System.out.print(¡°Y¡±);}
public B(){System.out.print(¡°B¡±);}
}
2£®ÏÂÃæ³ÌÐòµÄÔËÐнá¹ûΪ_________
public class Test{
public static void main(String[] args)
{
Sub obj = new Sub();
obj.print();
}
}
class Base{
public String s = ¡°X¡±;
public void print()
{
System.out.print(s);
printAgain();
}
public void printAgain()
{
System.out.print(¡°A¡±);
}
}
class Sub extends Base{
public String s = ¡°Y¡±;
public void printAgain()
{
System.out.print(¡°B¡±);
}
}
3£®ÏÂÃæ³ÌÐòµÄÔËÐнá¹ûΪ________
public class Test{
static int func(int i, int j){
try{
return i/j;
}catch(ArithmeticException e){
System.out.print(¡°A¡±);
return 0;
}catch(Exception e){
System.out.print(¡°B¡±);
return 0;
}finally{
System.out.print(¡°C¡±);
}
}
public static void main(String[] args){
System.out.println(func(10,0));
}
}
4£®ÏÂÃæ³ÌÐòµÄÔËÐнá¹ûΪ_______
class A{
void func1(){
System.out.print(¡°A¡±);
}
}
class B extends A{
void func2(){
System.out.print(¡°B¡±);
}
}
class C extends B{
void func2(){
System.out.print(¡°C¡±);
}
}
public class Test{
public static void main(String[] args){
B obj = new C();
obj.func1();
obj.func2();
}
}
5£®ÇëÌîдÏÂÃæ³ÌÐòµÄÊä³ö½á¹û
class A{int a = 1;}
public class Test{
public static void main(String[] args){
A obj1 = new A();
A obj2 = new A();
A obj3 = obj1;
String s1 = new String(¡°abc¡±);
String s2 = new String(¡°abc¡±);
String s3 = ¡°abc¡±;
System.out.println(obj1 == obj2);
System.out.println(obj1.equals(obj2));
System.out.println(obj1 == obj3);
System.out.println(s1 == s2);
System.out.println(s1.equals(s2));
System.out.println(s1.equals(s3));
}
}
ËÄ¡¢ ¼ò´ðÌ⣨¹²3Ì⣬ǰÁ½ÌâÿÌâ5·Ö£¬×îºóÒ»Ìâ6·Ö£¬¹²16·Ö£©
1£®Çë±àдһ¸öº¯Êýfunc()£¬½«´Ëº¯ÊýµÄÊäÈë²ÎÊý£¨intÐÍ£©ÄæÐòÊä³öÏÔʾ£¬Èç54321 ¨C> 12345£¬ÒªÇóʹÓõݹ飬²¢ÇÒº¯ÊýÌå´úÂë²»³¬¹ý8ÐС£
public class Test{
public void func(int i){
}
public static void main(String[] args){
Test t=new Test();