We offer the latest 1Z0-830 practice test designed for free and effective online Java SE 21 Developer Professional certification preparation. It's a simulation of the real 1Z0-830 exam experience, built to help you understand the structure, complexity, and topics you'll face on exam day.
Which StringBuilder variable fails to compile? java public class StringBuilderInstantiations { public static void main(String[] args) { var stringBuilder1 = new StringBuilder(); var stringBuilder2 = new StringBuilder(10); var stringBuilder3 = new StringBuilder("Java"); var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'}); } }
Which methods compile?
Given:
java 
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese); } catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
Given: java public class Test { public static void main(String[] args) throws IOException { Path p1 = Path.of("f1.txt"); Path p2 = Path.of("f2.txt"); Files.move(p1, p2); Files.delete(p1); } } In which case does the given program throw an exception?
Which three of the following are correct about the Java module system?
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