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Question 1

Given the code fragments:

class Employee {

Optional

address;

Employee (Optional

address) {

this.address = address;

}

public Optional

getAddress() { return address; }

}

class Address {

String city = ''New York'';

public String getCity { return city: }

public String toString() {

return city;

}

and

Address address = new Address;

Optional

addrs1 = Optional.ofNullable (address);

Employee e1 = new Employee (addrs1);

String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : ''City Not

available'';

System.out.println(eAddress);

What is the result?

ANew York

BCity Not available

Cnull

DA NoSuchElementException is thrown at run time.

Question 2

Given the code fragment:

Which code fragment, when inserted at line n1, enables the code to print /First.txt?

APath iP = new Paths (''/First.txt'');

BPath iP = Paths.toPath (''/First.txt'');

CPath iP = new Path (''/First.txt'');

DPath iP = Paths.get (''/'', ''First.txt'');

Question 3

Given records from the Player table:

and given the code fragment:

try {

Connection conn = DriverManager.getConnection(URL, username, password);

Statement st= conn.createStatement(

ResultSet.TYPE_SCROLL_SENSITIVE,

ResultSet.CONCUR_UPDATABLE);

st.execute (''SELECT * FROM Player'');

st.setMaxRows(2);

ResultSet rs = st.getResultSet();

rs.absolute(3);

while (rs.next ()) {

System.out.println(rs.getInt(1) + '' '' + rs.getString(2));

}

} catch (SQLException ex) {

System.out.print(''SQLException is thrown.'');

}

Assume that:

The required database driver is configured in the classpath.

The appropriate database is accessible with URL, username, and password.

The SQL query is valid.

What is the result?

A2 Jack3 Sam

BThe program prints nothing.

C3 Sam

DSQLException is thrown.

Question 4

Which action can be used to load a database driver by using JDBC3.0?

AAdd the driver class to the META-INF/services folder of the JAR file.

BInclude the JDBC driver class in a jdbc.properties file.

CUse the java.lang.Class.forName method to load the driver class.

DUse the DriverManager.getDriver method to load the driver class.

Question 5

Given the code fragment:

List str = Arrays.asList (''my'', ''pen'', ''is'', ''your', ''pen'');

Predicate test = s -> {

int i = 0;

boolean result = s.contains (''pen'');

System.out.print(i++) + '':'');

return result;

};

str.stream()

.filter(test)

.findFirst()

.ifPresent(System.out ::print);

What is the result?

A0 : 0 : pen

B0 : 1 : pen

C0 : 0 : 0 : 0 : 0 : pen

D0 : 1 : 2 : 3 : 4 :

EA compilation error occurs.

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