JAVA认证历年真题：310-025精选题（2）

会计考友

4. Which statements are true about listeners?
, K% m/ Y' r1 R! l% mA. The return value from a listener is of boolean type.
B. Most components allow multiple listeners to be added.
' _  Y$ T" U6 K. Y- u1 jC. A copy of the original event is passed into a listener method.
  v- }& I% x5 X& @1 vD. If multiple listeners are added to a single component, they all must all be friends to each other.
  J8 M. s0 B7 rE. If the multiple listeners are added to a single component, the order [in which listeners are called is guaranteed].
BC.
9 u' z# j6 x* D) \) C5. What might cause the current thread to stop executing.
A.An InterruptedException is thrown.
B.The thread executes a wait() call.
C.The thread constructs a new Thread.
  W* r, K) T% l0 r: D( T, cD.A thread of higher priority becomes ready.
! Q5 r+ k% N1 n. l$ aE.The thread executes a waitforID() call on a MediaTracker.
* H8 |3 }0 z. [# e0 ]3 |1 fABDE.
6. Given the following incomplete method.
1. public void method(){
7 h2 R6 n+ U0 ~0 R! W# I0 `2.
3. if (someTestFails()){
# o! `) P5 A+ U$ y; C  @7 X4.
5. }
/ M, b% [& ^9 g: U& M. K6 {) `6.
7.}
You want to make this method throw an IOException if, and only if, the method someTestFails() returns a value of true.
Which changes achieve this?
A. Add at line 2: IOException e;
B. Add at line 4: throw e;
. x( S' C" C: b( N4 I; gC. Add at line 4: throw new IOException();
D. Add at line 6: throw new IOException();
9 O0 C! [* C' X' {$ EE. Modify the method declaration to indicate that an object of [type] Exception might be thrown.
5 F0 B+ j5 O2 X* }7 I, hDE. (E suppose they mean the method declaration for someTestFails.)