Oracle Java SE 21 Developer Professional - 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) 10
B) It throws an exception.
C) _$
D) Compilation fails.

2. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) An exception is thrown at runtime
B) false
C) 3.3
D) true
E) Compilation fails

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

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

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

5. 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,h i]
B) [,hello,hi]
C) [ ,hello,h i]
D) [ , hello ,hi ]

Solutions: