📄 认证与培训 - 希望对大家有帮助(280道考题回忆).mht
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=
color=3D#555555>=BF=BC=CC=E2=BB=D8=D2=E4<BR>Sreejith<BR>310-025
<P>1.public static void main(String args[]) =
{<BR>Boolean=20
a[]=3Dnew Boolean[4];<BR>int I=3D=20
1;<BR>System.out.println(a[I]); }<BR>What will =
be=20
printed?<BR>Compilation Error in Line =
2<BR>Compilation=20
Error in line 4<BR>Exception in Line 4<BR>Will =
print=20
true<BR>Will print false<BR>Will print null
<P>Ans:F<BR>2.<BR>public static void main(String =
args[])=20
{<BR>Integer b=3D new=20
=
Integer(10);<BR>Add(b);<BR>System.out.println(b.intvalue());<BR>}<BR>void=
=20
Add(Integer b)<BR>{<BR>int I=3D=20
b.intvalue();<BR>I+=3D3;<BR>b=3D new =
Integer(I)<BR>}
<P>What will be printed out?
<P>Will print 13<BR>Will print 10<BR>Compilation =
Error=20
in Line 4 ?. implicit conversion to Integer =
to<BR>String=20
is not possible<BR>Compilation Error in line 10 =
you=20
can't re initialize a =
Wrapper<BR>class<BR>Exception in=20
Line 10<BR>Ans:b
<P>class text{<BR>public static void main(String =
args[])<BR>{<BR>String a =3Dargs[1];<BR>String b =
=3Dargs[2];<BR>String c =
=3Dargs[3];<BR>}<BR>}<BR>if you will=20
execute java text cat dog sheep what will be the =
value=20
of<BR>the 'c' =
?<BR>cat<BR>dog<BR>sheep<BR>Compilation=20
Error<BR>Exception will occur<BR>Ans:E
<P>4. public static void main(String=20
args[])<BR>{<BR>Float f=3Dnew =
Float(4.2f);<BR>Float=20
c;<BR>Double d=3Dnew Double(4.2);<BR>float=20
fl=3D4.2f;<BR>c=3Df;<BR>}<BR>which will return =
true?. Select=20
=
all<BR>f.equls(d)<BR>c=3D=3Df<BR>c=3D=3Dd<BR>c.equls(f)
<P>Ans:B,D
<P>5. public static void main(String=20
args[])<BR>{<BR>String =
s;<BR>System.out.println("s =3D=20
"+s);<BR>}<BR>what will be printed =
out?<BR>Compilation=20
Error<BR>An Exception will occur<BR>Will print =
s=3D=20
null<BR>Will print s=3D
<P>Ans:A<BR>6. class s extends Thread{int =
j=3D0;<BR>public=20
void run()=20
{<BR>try{Thread.sleep(5000);}<BR>catch(Exception =
e){}
<P>j=3D100;<BR>}<BR>public static void =
main(String=20
args[])<BR>{<BR>s t1=3Dnew=20
=
s();<BR>t1.start();<BR>System.out.println(t1.j);<BR>}<BR>}
<P>what you have to do to ensure that 'j' will =
print 100
<P>you have make t1 as Daemon Thread<BR>You have =
join=20
the t1 to main<BR>You have to suspend the main =
when the=20
thread starts and resume it after<BR>the value =
of 'j' is=20
set to 100<BR>You have to interrupt the main =
thread
<P>Ans:B<BR>7. What will happen if you =
compile/run this=20
code?
<P>1: public class Q1 implements Runnable<BR>2: =
{<BR>3:=20
public void run(String s)<BR>4: {<BR>5:=20
System.out.println("Before start Thread=20
:"+s);<BR>6:<BR>7: System.out.println("After =
stop of=20
Thread :"+s);<BR>8: }<BR>9:<BR>10: public static =
void=20
main(String[] args)<BR>11: {<BR>12: Q1 a =3D new =
Q1();<BR>13: Thread t=3Dnew Thread(a);<BR>14:=20
t.start();}<BR>15: }
<P>A) Compilation error at line 1<BR>B) Runtime=20
exception at line 13.<BR>C) Compilation error at =
line=20
14<BR>D) Prints "Before start of Thread =
"<BR>After Start=20
of Thread
<P>Ans:A<BR>8. class s implements =
Runnable{<BR>int=20
x=3D0,y=3D0;<BR>int addX(){x++; return =
x;}<BR>int=20
addY(){y++; return y;}
<P>public void run()<BR>{<BR>for(int=20
=
i=3D0;i<10;i++)<BR>System.out.println(addX()+""+addY());<BR>}
<P>public static void main(String =
args[])<BR>{<BR>s=20
run=3Dnew s();<BR>Thread t1=3Dnew =
Thread(run);<BR>Thread=20
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