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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) =US-UK
B) US-UK
C) An exception is thrown.
D) Compilation fails.
E) -US=UK
F) US=UK

2. Which of the following java.io.Console methods doesnotexist?

A) readLine(String fmt, Object... args)
B) read()
C) readPassword(String fmt, Object... args)
D) readLine()
E) readPassword()
F) reader()

3. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42);
B) var concurrentHashMap = new ConcurrentHashMap(42, 10);
C) None of the suggestions.
D) var concurrentHashMap = new ConcurrentHashMap();
E) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);

4. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) truetruetrue
B) truefalsetrue
C) truetruefalse
D) Compilation fails
E) falsetruetrue

5. Which of the following can be the body of a lambda expression?

A) Two expressions
B) Two statements
C) A statement block
D) An expression and a statement
E) None of the above

Solutions: