Free 1z0-829: Java SE 17 Developer Exam Questions and Answers

Given: int total = 0; outer: for (int i = 0; i < 4; i++) { for (int j = 0; j < 4; j++) { if (j == 2) continue outer; if (i == 3) break outer; total += i + j; } } System.out.println(total); Which two statements are true? (Choose two.)

Select 2 answers.

• AA. The statement total += i + j executes exactly 6 times.
• BB. The code prints 9.
• CC. The code fails to compile because continue cannot name the label of an enclosing for loop.
• DD. The code prints 12.
• EE. The break outer statement is first reached when i is 2.

Given: LocalDate start = LocalDate.of(2024, 1, 31); LocalDate d = start.plusMonths(1).plusDays(1); Period p = Period.between(start, d); System.out.println(d + " " + p); What is the result?

• AA. 2024-03-01 P1M2D
• BB. 2024-03-01 P1M1D
• CC. 2024-03-01 P2M-30D
• DD. 2024-03-02 P1M1D
• EE. An exception is thrown at runtime.

Given: StringBuilder sb = new StringBuilder("abcdef"); sb.insert(3, "XY").reverse().deleteCharAt(0).replace(1, 3, "-"); System.out.println(sb + " " + sb.length()); What is the result?

• AA. ed-Xcba 7
• BB. An exception is thrown at runtime.
• CC. e-Xcba 6
• DD. e-YXcba 7
• EE. e-Xcba 7

Given that table acct is initially empty, con is an open Connection, and no exception is thrown: con.setAutoCommit(false); Statement st = con.createStatement(); st.executeUpdate("INSERT INTO acct VALUES (1, 100)"); Savepoint sp = con.setSavepoint(); st.executeUpdate("INSERT INTO acct VALUES (2, 200)"); con.rollback(sp); st.executeUpdate("INSERT INTO acct VALUES (3, 300)"); con.commit(); Which rows does table acct contain after the code runs?

• AA. The row with id 3 only
• BB. No rows
• CC. The rows with ids 1 and 3
• DD. The rows with ids 1, 2 and 3
• EE. The row with id 1 only

Given: List<Integer> list = new ArrayList<>(List.of(10, 20, 30, 40)); list.remove(Integer.valueOf(30)); list.remove(1); list.add(1, 5); Which two statements are true after the code executes? (Choose two.)

Select 2 answers.

• AA. list.contains(30) returns true.
• BB. list.contains(20) returns true.
• CC. list.get(1) returns 5.
• DD. list.indexOf(40) returns 1.
• EE. list.size() returns 3.

The classpath contains these resource bundle files, each defining the key hello: Msg.properties hello=Hello default Msg_en.properties hello=Hello en Msg_fr.properties hello=Bonjour Given: Locale.setDefault(new Locale("en", "US")); ResourceBundle rb = ResourceBundle.getBundle("Msg", new Locale("de", "DE")); System.out.println(rb.getString("hello")); What is the result?

• AA. Hello en
• BB. Bonjour
• CC. Hello default
• DD. A MissingResourceException is thrown at runtime.
• EE. Compilation fails.

Given: public class Counter { private int count; public void inc() { count++; } public int get() { return count; } } Multiple threads call inc() and get() on one shared Counter instance. Which two modifications make Counter thread-safe? (Choose two.)

Select 2 answers.

• AA. Declare count as volatile.
• BB. Declare both inc() and get() as synchronized.
• CC. Change count to an AtomicInteger, use incrementAndGet() in inc() and get() in get().
• DD. Call Thread.yield() immediately before count++ in inc().
• EE. Create a new ReentrantLock inside inc() and wrap count++ in lock() and unlock() calls.

Given: public class Test { static int check() { int x = 1; try { x = 2; throw new IllegalStateException(); } catch (RuntimeException e) { x = 3; return x; } finally { x = 4; } } public static void main(String[] args) { System.out.println(check()); } } What is the result?

• AA. 2
• BB. An exception is thrown at runtime.
• CC. 4
• DD. Compilation fails.
• EE. 3

Given: int n = 2; Which two statements compile? (Choose two.)

Select 2 answers.

• AA. String r = switch (n) { case 1 -> "one"; default -> { System.out.println("x"); } };
• BB. String r = switch (n) { case 1, 2 -> "low"; default -> "high"; };
• CC. String r = switch (n) { case 1: yield "one"; default: yield "many"; };
• DD. String r = switch (n) { case 1 -> "one"; case 2 -> "two"; };
• EE. String r = switch (n) { case 1 -> "one"; case 1 -> "uno"; default -> "many"; };

Given: class Res implements AutoCloseable { private final String name; Res(String name) { this.name = name; } public void close() throws Exception { System.out.print("close" + name + " "); throw new Exception("c" + name); } } public class Test { public static void main(String[] args) { try (Res a = new Res("A"); Res b = new Res("B")) { System.out.print("body "); throw new RuntimeException("body"); } catch (Exception e) { System.out.print(e.getMessage() + " " + e.getSuppressed().length); } } } Which two statements are true? (Choose two.)

Select 2 answers.

• AA. The caught exception has two suppressed exceptions.
• BB. The exception thrown by the close method of a replaces the RuntimeException.
• CC. Resource b is closed before resource a.
• DD. The code fails to compile because main does not declare the Exception thrown by close().
• EE. The message of the caught exception is cB.