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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 May. 16, 2023
Given:
class Book {
int id;
String name;
public Book (int id, String name) {
this.id = id;
this.name = name;
}
public boolean equals (Object obj) { //line n1
boolean output = false;
Book b = (Book) obj;
if (this.id = = b.id) {
output = true;
}
return output;
}
}
and the code fragment:
Book b1 = new Book (101, ''Java Programing'');
Book b2 = new Book (102, ''Java Programing'');
System.out.println (b1.equals(b2)); //line n2
Which statement is true?
Given the code fragment:
LocalDate valentinesDay =LocalDate.of(2015, Month.FEBRUARY, 14);
LocalDate next15days = valentinesDay.plusDays (15);
LocalDate nextYear = next15days.plusYears(1); // line n1
System.out.println(nextYear);
What is the result?
Given the code fragments:
interface CourseFilter extends Predicate
public default boolean test (String str) {
return str.contains (''Java'');
}
}
and
List
Predicate
Predicate cf2 = new CourseFilter() { //line n1
public boolean test (String s) {
return s.startsWith (''Java'');
}
};
long c = strs.stream()
.filter(cf1)
.filter(cf2//line n2
.count();
System.out.println(c);
What is the result?
Given the code fragment:
List
empDetails.stream()
.filter(s-> s.contains(''r''))
.sorted()
.forEach(System.out::println); //line n1
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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