1Z1-804 無料問題集「Oracle Java SE 7 Programmer II」

（A）Change Signature of checkingAccount to: CheckingAccount implements Account.

（B）Implement public methods for deposit and withdraw in CheckingAccount.

（C）Change the signature of CheckingAccount to: public abstract CheckingAccount

（D）Implement private methods for deposit and withdraw in CheckingAccount.

（E）Change the signature of Account to: public class Account.

（F）Make Account an interface.

（A）public class Example (G) { }

（B）public class Example (Generic) { }

（C）public class <Example> { }

（D）public class Example < T > { }

（E）public class Example { }

（F）public class Example <> { }

（A）concrete classes

（B）primitives

（C）enums

（D）interfaces

（E）abstract classes

（F）primitive wrappers

（A）Three

（B）One

（C）The program runs, but prints no output.

（D）Compilation fails.

（A）OutputStream fos = new FileOutputStream(new File("/tmp/data.bin"));
OutputStream bos = new BufferedOutputStream(fos);
DataOutputStream dos = new DataOutputStream(bos);
dos.writeByte(0);
dos.close();

（B）OutputStream fos = new FileOutputStream ("/tmp/data.bin"); fos.writeByte(0); fos.close();

（C）OutputStream fos = new FileOutputStream ("/tmp/data.bin"); DataOutputStream dos = new DataOutputStream(fos); dos.writeByte(0); dos.close();

（D）OutputStream fos = new FileOutputStream (new File ("/tmp/data.bin"));
DataOutputStream dos = new DataOutputStream(fos);
dos.writeByte(0);
dos.close();

（A）An exception is thrown at runtime

（B）Compilation fails due to an error on line 7

（C）5

（D）Compilation fails due to an error on line 6

（E）6

（A）Include the JDBC driver class in a jdbcproperties file.

（B）Use the DriverManager.getDriver method to load the driver class.

（C）Set the driver class name by using the jdbc.drivers system property.

（D）Use the java.lang.class.forName method to load the driver class.

（E）Add the driver class to the META-INF/services folder of the JAR file.

（A）DOS file attributes can be read as a set in a single method call.

（B）DOS file attributes can be modified for symbolic links and regular files.

（C）DOS file attributes can be changed as a set in a single method call.

（D）DOS file attributes can be modified in the same method that creates the file.

（A）E

（B）D

（C）B

（D）C

（E）A

（A）interface Compilable { static void compile(); }

（B）interface Compilable {
final void compile();
}

（C）interface Compilable {
void compile();
}

（D）interface Compilable {
protected abstract void compile ();
}

（E）interface Compilable { abstract void compile(); }