最も有効な 1z0-830 試験参考書

Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

• A. Compilation fails.
• B. abc
• C. ABC
• D. An exception is thrown.

Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

• A. var h = (g = 7);
• B. var f = { 6 };
• C. var e;
• D. var a = 1;(Valid: var correctly infers int)
• E. var b = 2, c = 3.0;
• F. var d[] = new int[4];

Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

• A. arduino
  1,Kylian Mbappe,Keyboard,2,25.50
  2,Teddy Riner,Mouse,1,15.99
  3,Sebastien Loeb,Monitor,1,199.99
  4,Antoine Griezmann,Headset,3,45.00
• B. Compilation fails.
• C. arduino
  2,Teddy Riner,Mouse,1,15.99
  3,Sebastien Loeb,Monitor,1,199.99
• D. arduino
  1,Kylian Mbappe,Keyboard,2,25.50
  2,Teddy Riner,Mouse,1,15.99
• E. An exception is thrown at runtime.

Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?

• A. Compilation fails.
• B. Peugeot
• C. Peugeot 807
• D. An exception is thrown at runtime.

Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

• A. SmartPhone interface does not compile
• B. Everything compiles
• C. Iphone15 class does not compile
• D. An exception is thrown at running Iphone15.ring();