JAVA认证SCJP认证真题及答案（16）

　　QUESTION NO 136

　　Which constructs a DataOutputStream?

　　A. New dataInputStream(“in.txt”);

　　B. New dataInputStream(new file(“in.txt”));

　　C. New dataInputStream(new writer(“in.txt”));

　　D. New dataInputStream(new FileWriter(“in.txt”));

　　E. New dataInputStream(new InputStream(“in.txt”));

　　F. New dataInputStream(new FileInputStream(“in.txt”));

　　Answer: F

　　QUESTION NO 137

　　Which can be used to decode charS for output?

　　A. Java.io.InputStream.

　　B. Java.io.EncodedReader.

　　C. Java.io.InputStreamReader.

　　D. Java.io.InputStreamWriter.

　　E. Java.io.BufferedInputStream.

　　Answer: C

　　QUESTION NO 138

　　Given:

　　1. public class Test {

　　2. public static void main (String args) {

　　3. string foo = “blue”;

　　4. string bar = foo;

　　5. foo = “green”;

　　6. System.out.printIn(bar);

　　7. }

　　8. }

　　What is the result?

　　A. An exception is thrown.

　　B. The code will not compile.

　　C. The program prints “null”

　　D. The program prints “blue”

　　E. The program prints “green”

　　Answer: D

　　QUESTION NO 139

　　Which code determines the int value foo closest to a double value bar?

　　A. Int foo = (int) Math.max(bar);

　　B. Int foo = (int) Math.min(bar);

　　C. Int foo = (int) Math.abs(bar);

　　D. Int foo = (int) Math.ceil(bar);

　　E. Int foo = (int) Math.floor(bar);

　　F. Int foo = (int) Math.round(bar);

　　Answer: F |||

　　QUESTION NO 140

　　Which two demonstrate encapsulation of data? (Choose Two)

　　A. Member data have no access modifiers.

　　B. Member data can be modified directly.

　　C. The access modifier for methods is protected.

　　D. The access modifier to member data is private.

　　E. Methods provide for access and modification of data.

　　Answer: D, E