Free Oracle 1z1-830 Exam Dumps Questions & Answers

Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

• A.  Sum: 22.0, Max: 8.5, Avg: 5.5
• B.  An exception is thrown at runtime.
• C.  Compilation fails.
• D.  Sum: 22.0, Max: 8.5, Avg: 5.0

What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

• A.  It throws an exception
• B.  PT0H
• C.  Compilation fails
• D.  PT0D
• E.  PT6H

What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

• A.  666 666
• B.  Compilation fails
• C.  42 42
• D.  666 42

Which methods compile?

• A.  ```java
  public List<? super IOException> getListSuper() {
  return new ArrayList<FileNotFoundException>();
  }
• B.  ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
• C.  ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
• D.  ```java
  public List<? extends IOException> getListExtends() {
  return new ArrayList<FileNotFoundException>();
  }

Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

• A.  RuntimeException
• B.  ArithmeticException
• C.  Compilation fails
• D.  IOException