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Oracle 1Z0-809 Exam
- Topic 1: Develop Code That Uses Static Keyword On Initialize Blocks, Variables, Methods, And Classes
- Topic 2: Develop Code To Extract Data From An Object Using Peek() And Map() Methods Including Primitive Versions Of The Map() Method
- Topic 3: Implement Inheritance Including Visibility Modifiers And Composition/ Use Method References With Streams
- Topic 4: Create And Use Arraylist, Treeset, Treemap, And Arraydeque Objects/ Override Hashcode, Equals, And Tostring Methods From Object Class
- Topic 5: Search For Data By Using Search Methods Of The Stream Classes Including Findfirst, Findany, Anymatch, Allmatch, Nonematch
- Topic 6: Save Results To A Collection Using The Collect Method And Group/Partition Data Using The Collectors Class
- Topic 7: Work With Dates And Times Across Timezones And Manage Changes Resulting From Daylight Savings Including Format Date And Times Values
- Topic 8: Create And Use Singleton Classes And Immutable Classes/ Use Java.Util.Comparator And Java.Lang.Comparable Interfaces
- Topic 9: Develop Code That Uses Stream Data Methods And Calculation Methods/ Iterate Using Foreach Methods Of Streams And List
- Topic 10: Create And Manage Date-Based And Time-Based Events Including A Combination Of Date And Time Into A Single Object Using Localdate, Localtime, Localdatetime
- Topic 11: Define And Create And Manage Date-Based And Time-Based Events Using Instant, Period, Duration, And Temporalunit/ Filter A Collection By Using Lambda Expressions
- Topic 12: Describe Stream Interface And Stream Pipeline/ Create Inner Classes Including Static Inner Class, Local Class, Nested Class, And Anonymous Inner Class
- Topic 13: Use The Built-In Interfaces Included In The Java.Util.Function Package Such As Predicate, Consumer, Function, And Supplier
- Topic 14: Use Enumerated Types Including Methods, And Constructors In An Enum Type/ Implement Polymorphism/ Create And Use A Generic Class
- Topic 15: Develop Code That Declares, Implements And/Or Extends Interfaces And Use The @Override Annotation/ Develop Code That Uses The Optional Class
- Topic 16: Develop Code That Uses Primitive Versions Of Functional Interfaces/ Develop Code That Uses Abstract Classes And Methods
- Topic 17: Develop Code That Uses Binary Versions Of Functional Interfaces/ Use Autoclose Resources With A Try-With-Resources Statement
- Topic 18: Develop Code That Uses The Unaryoperator Interface/ Create Custom Exceptions And Auto-Closeable Resources/ Lambda Built-In Functional Interfaces
- Topic 19: Use Catch, Multi-Catch, And Finally Clauses/ Use Flatmap() Methods In The Stream API/ Develop Code That Uses The Final Keyword
Free Oracle 1Z0-809 Exam Actual Questions
The questions for 1Z0-809 were last updated On Feb. 02, 2023
Given the code fragment:
List
empDetails.stream()
.filter(s-> s.contains(''r''))
.sorted()
.forEach(System.out::println); //line n1
What is the result?
Given:
class Vehicle implements Comparable
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + '':'' + name;
}
public int compareTo(Vehicle o) {
return this.name.compareTo(o.name);
}
and this code fragment:
Set
vehicles.add(new Vehicle (10123, ''Ford''));
vehicles.add(new Vehicle (10124, ''BMW''));
System.out.println(vehicles);
What is the result?
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + '':'' + name + '':'' + city;
}
public String getCourse() {return course;}
public String getName() {return name;}
public String getCity() {return city;}
and the code fragment:
List
new Student (''Jessy'', ''Java ME'', ''Chicago''),
new Student (''Helen'', ''Java EE'', ''Houston''),
new Student (''Mark'', ''Java ME'', ''Chicago''));
stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.forEach(src, res) -> System.out.println(res));
What is the result?
Given the code fragments:
class Employee {
Optional
address;Employee (Optional
address) {this.address = address;
}
public Optional
getAddress() { return address; }}
class Address {
String city = ''New York'';
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = new Address;
Optional
addrs1 = Optional.ofNullable (address);Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : ''City Not
available'';
System.out.println(eAddress);
What is the result?
Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (!aFile.isDirectory ()) {
if (aFile.getName ().endsWith (''.class''))
aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the recDelete () method when it is invoked.
What is the result?
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