Oracle 1z0-830 : Java SE 21 Developer Professional

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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) WithInstanceField
B) WithStaticField
C) ExtendingClass
D) ImplementingInterface

2. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It throws an exception at runtime.
B) It does not compile.
C) It compiles.

3. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) Compilation fails
B) 012
C) An exception is thrown
D) 01
E) Nothing

4. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {c=1, b=2, a=3}
B) Compilation fails
C) {a=3, b=1, c=2}
D) {a=1, b=2, c=3}
E) {b=1, c=2, a=3}
F) {b=1, a=3, c=2}
G) {c=2, a=3, b=1}

5. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \t
green\t
blue \t
""";
B) java
String colors = """
red
green
blue
""";
C) java
String colors = """
red \
green\
blue \
""";
D) java
String colors = """
red \s
green\s
blue \s
""";
E) None of the propositions

Solutions: