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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ImplementingInterface
B) WithInstanceField
C) ExtendingClass
D) WithStaticField

2. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ , hello ,hi ]
B) [ ,hello,h i]
C) [,hello,hi]
D) [,hello,h i]

3. Which methods compile?

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

4. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cbca
B) bac
C) cacb
D) abc
E) acb
F) bca
G) cba

5. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Saint-Emilion
B) Beaujolais Nouveau, Chablis, Saint-Emilion
C) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
D) Rose

Solutions: