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Course 6
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What is the result?
String s = null;
System.out.println(s.length());
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Which best describes a class vs an object?
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Which keyword is used for inheritance?
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What does this code do?
Listnums = List.of(1, 2, 3);
nums.stream().map(n -> n * 2).forEach(System.out::println);
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Which statement about Optional is true?
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Which of the following is a correct way to read a file safely?
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What is the output?
System.out.println(10 / 3);
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Which of the following is immutable?
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What is a NullPointerException?
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What will happen here?
class User { private String name; User(String name) { this.name = name; } @Override public boolean equals(Object obj) { if (!(obj instanceof User)) return false; User other = (User) obj; return name.equals(other.name); } } Set users = new HashSet<>(); users.add(new User("Alex")); users.add(new User("Alex")); System.out.println(users.size());
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