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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
B) css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
C) bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop

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

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

3. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var h = (g = 7);
B) var e;
C) var b = 2, c = 3.0;
D) var f = { 6 };
E) var a = 1;(Valid: var correctly infers int)
F) var d[] = new int[4];

4. Which of the following java.io.Console methods doesnotexist?

A) readLine()
B) readPassword()
C) reader()
D) readLine(String fmt, Object... args)
E) read()
F) readPassword(String fmt, Object... args)

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

Solutions: