1z0-809無料問題集「Oracle Java SE 8 Programmer II」

質問 1

Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)

（A）public abstract class Task implements Doable {public void doSomethingElse(String s) { }}

（B）public abstract class Work implements Doable {public abstract void doSomething(String s) { }public void doYourThing(Boolean b) { }}

（C）public class Job implements Doable {public void doSomething(Integer i) { }}

（D）public class Action implements Doable {public void doSomething(Integer i) { }public String doThis (Integer j) { }}

（E）public class Do implements Doable {public void doSomething(Integer i) { }public void doSomething (String s) { }public void doThat (String s) { }}

正解：A、E 解答を投票する

質問 2

Given:
public class product {
int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + ":" + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?

（A）4 : 0

（B）2 : 30

（C）The program prints nothing.

（D）4 : 602 : 303 : 201 : 10

（E）4 : 70

正解：E 解答を投票する

質問 3

Given:

What is the result?

（A）A compilation error occurs in the Daze class.

（B）Bar HelloFoo Hello

（C）Bar HelloBaz Hello

（D）Baz Hello

正解：C 解答を投票する

質問 4

Given the code fragment:

Which modification enables the code to print Price 5 New Price 4?

（A）Replace line n1 with .forEach (e -> System.out.print ("Price" + e))

（B）Replace line n2 with .map (n -> System.out.println ("New Price" + n -1)) and remove line n3

（C）Replace line n2 with .mapToInt (n -> n - 1);

（D）Replace line n3 with .forEach (n -> System.out.println ("New Price" + n));

正解：D 解答を投票する

質問 5

Which two statements are true about synchronization and locks? (Choose two.)

（A）Threads cannot acquire intrinsic locks on classes.

（B）The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.

（C）A thread automatically acquires the intrinsic lock on a synchronized statement when executed.

（D）A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the time it releases it.

（E）A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that method.

正解：B、C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 6

Given:
interface Rideable {Car getCar (String name); }
class Car {
private String name;
public Car (String name) {
this.name = name;
}
}
Which code fragment creates an instance of Car?

（A）Car auto = Car ("MyCar"): : new;

（B）Rideable rider = Car : : new;Car vehicle = rider.getCar("MyCar");

（C）Car vehicle = Rideable : : new : : getCar("MyCar");

（D）Car auto = Car : : new;Car vehicle = auto : : getCar("MyCar");

正解：B 解答を投票する

質問 7

Given:

Which two interfaces can you use to create lambda expressions? (Choose two.)

（A）R

（B）P

（C）Q

（D）U

（E）S

（F）T

正解：B、E 解答を投票する

質問 8

Which statement is true about java.time.Duration?

（A）It preserves daylight saving time.

（B）It defines time-based values.

（C）It defines date-based values.

（D）It tracks time zones.

正解：B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 9

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?

（A）SQLException is thrown.

（B）The program prints nothing.

（C）3 Sam

（D）2 Jack3 Sam

正解：A 解答を投票する

質問 10

Given the code fragment:
UnaryOperator<Double> uo1 = s -> s*2;//line n1
List<Double> loanValues = Arrays.asList(1000.0, 2000.0);
loanValues.stream()
.filter(lv -> lv >= 1500)
.map(lv -> uo1.apply(lv))//line n2
.forEach(s -> System.out.print(s + " "));
What is the result?

（A）A compilation error occurs at line n1.

（B）4000.0

（C）A compilation error occurs at line n2.

（D）4000

正解：C 解答を投票する

質問 11

Given the code fragment:

What is the result?

（A）Java EEJava SE

（B）Java EEJava EESE

（C）The program prints either:Java EEJava SEorJava SEJava EE

（D）Java EESE

正解：C 解答を投票する

質問 12

You have been asked to create a ResourceBundle which uses a properties file to localize an application.
Which code example specifies valid keys of menu1 and menu2 with values of File Menu and View Menu?

（A）menu1, File Menu, menu2, View Menu

（B）menu1 = File Menumenu2 = View Menu

（C）<key name = 'menu1">File Menu</key><key name = 'menu2">View Menu</key>

（D）<key>menu1</key><value>File Menu</value><key>menu2</key><value>View Menu</value>

正解：B 解答を投票する

質問 13

Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path1.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?

（A）/app/log/sys/server/exe/readme

（B）/app/./sys/log/readme

（C）/app/sys/log/readme/server/exe

（D）/app/./sys/log/server/exe/readme

正解：B 解答を投票する

質問 14

Given the code fragment:

Assume that dbURL, userName, and password are valid.
Which code fragment can be inserted at line n1 to enable the code to print Connection Established?

（A）Properties prop = new Properties();prop.put ("user", userName);prop.put ("password", password);con = DriverManager.getConnection (dbURL, prop);

（B）con = DriverManager.getConnection (userName, password, dbURL);

（C）con = DriverManager.getConnection (dbURL);con.setClientInfo ("user", userName);con.setClientInfo ("password", password);

（D）Properties prop = new Properties();prop.put ("userid", userName);prop.put ("password", password); prop.put("url", dbURL);con = DriverManager.getConnection (prop);

正解：A 解答を投票する

1z0-809 無料問題集「Oracle Java SE 8 Programmer II」

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