Online Access Free 1z1-830 Practice Test

Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

• A.Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
• B.Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
  java
  authorsMap1.put("FR", frenchAuthors);
• C.Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
• D.var authorsMap3 = new HashMap<>();
  java
  authorsMap3.put("FR", frenchAuthors);
• E.Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);

Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

• A.Compilation fails.
• B.Sum: 22.0, Max: 8.5, Avg: 5.0
• C.Sum: 22.0, Max: 8.5, Avg: 5.5
• D.An exception is thrown at runtime.

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

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

Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

• A.1 1 2 3
• B.1 5 5 1
• C.1 1 1 1
• D.5 5 2 3
• E.1 1 2 2

Which of the followingisn'ta correct way to write a string to a file?

• A.java
  try (PrintWriter printWriter = new PrintWriter("file.txt")) {
  printWriter.printf("Hello %s", "James");
  }
• B.java
  try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
  }
• C.None of the suggestions
• D.java
  try (FileWriter writer = new FileWriter("file.txt")) {
  writer.write("Hello");
  }
• E.java
  Path path = Paths.get("file.txt");
  byte[] strBytes = "Hello".getBytes();
  Files.write(path, strBytes);
• F.java
  try (BufferedWriter writer = new BufferedWriter("file.txt")) {
  writer.write("Hello");
  }