Oracle 1z1-830

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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [,hello,h i]
B) [ , hello ,hi ]
C) [,hello,hi]
D) [ ,hello,h i]

2. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's either 1 or 2
B) It's either 0 or 1
C) It's always 2
D) It's always 1
E) Compilation fails

3. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ImplementingInterface
B) WithInstanceField
C) WithStaticField
D) ExtendingClass

4. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) Compilation fails at line n1.
B) markdown
Inner class:
------------
Outer field
C) Nothing
D) An exception is thrown at runtime.
E) Compilation fails at line n2.

5. Which of the following isn't a valid option of the jdeps command?

A) --generate-module-info
B) --print-module-deps
C) --generate-open-module
D) --list-deps
E) --check-deps
F) --list-reduced-deps

Solutions: