1z0-830 Free Practice Test

Given: java
String colors = "redn" + "greenn" +
"bluen";
Which text block can replace the above code?

1. A. javaString colors = """ red \green\ blue \ """;
2. B. javaString colors = """ red \sgreen\s blue \s """;
3. C. javaString colors = """ red \tgreen\t blue \t """;
4. D. javaString colors = """ redgreen blue """;
5. E. None of the propositions

Correct Answer: D

Given: java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest { public static void main(String[] args) {
Class vehicleClass = Vehicle.class; Class carClass = Car.class; Class bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() + "; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?

1. A. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
2. B. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
3. C. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
4. D. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true

Correct Answer: C

Given: java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

1. A. A a = new A();
2. B. B b = new Test.B();
3. C. A a = new Test.A();
4. D. B b = new Test().new B();
5. E. B b = new B();
6. F. A a = new Test().new A();

Correct Answer: BEF

Given: java
int post = 5; int pre = 5;
int postResult = post++ + 10; int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post + ", Final value of pre: " + pre); What is printed?

1. A. postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
2. B. postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
3. C. postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
4. D. postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5

Correct Answer: A

Which of the following java.io.Console methods doesnotexist?

1. A. read()
2. B. reader()
3. C. readLine()
4. D. readLine(String fmt, Object... args)
5. E. readPassword()
6. F. readPassword(String fmt, Object... args)

Correct Answer: A