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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Which methods compile?

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

Question 2

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 \s
green\s
blue \s
""";
C. java
String colors = """
red \
green\
blue \
""";
D. None of the propositions
E. java
String colors = """
red
green
blue
""";

Question 3

Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A. 1 1 2
B. 2 2 1
C. An exception is thrown.
D. 1 2 2
E. 1 1 1
F. 2 1 1
G. 2 2 2
H. 1 2 1
I. 2 1 2

Question 4

Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A. An IndexOutOfBoundsException is thrown
B. [c, b]
C. [a, b]
D. An UnsupportedOperationException is thrown
E. [d, b]
F. [d]

Question 5

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

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

Solutions: