1Z0-819 Exam Questions

Given: public class Test { public static void main(String[] args) { int x; int y = 5; if (y > 2) { x = ++y; } else { y++; } System.out.print(x + " " + y); } } What is the result?

Given: public class DNASynth { int aCount; int tCount; int cCount; int gCount; void setACount(int cCount) { cCount = cCount; } void setTCount() { this.tCount = tCount; } int setCCo...

Given: public class Tester { public static void main(String[] args) { char letter = 'b'; int i = 0; switch (letter) { case 'a': i++; break; case 'b': i++; case 'c': // 'd': // line...

Given this code fragment: int x = 0; do { x++; if (x == 1) { continue; } System.out.println(x); } while (x < 1); What is the result?

Given: public class Foo { public static void main(String... args) { for (var x : args) { System.out.println(x); } } } What is the type of the local variable x?

Analyze the code: public class Test { private static String prefix = "Global:"; public static String name = "Namespace"; public static String getName() { return new Test().name; }...

Given: import java.util.*; public class Foo { public public List<Number> foo(Set<CharSequence> m) { ... } } and import java.util.*; public class Bar extends Foo { //line 1 } Which...

Given: public class Foo { private void print() { System.out.println("Bonjour le monde!"); } public void foo() { print(); } } public class Bar extends Foo { private void print() { S...

Given: public method foo() throws FooException { ... } and omitting the throws FooException clause results in a compilation error.Which statement is true about FooException?

Which describes an aspect of Java that contributes to high performance?

Which two method implementations are correct, when inserted independently in line 1? (Choose two.)

Given this formula to calculate a monthly mortgage payment: M = P * (i(1+i)^n) / ((1+i)^n - 1) and these declarations: double m; double i = 0.05/12; //monthly interest rate int p =...

Which is the correct order of possible statements in the structure of a Java class file?

Module vehicle depends on module part and makes its com.vehicle package available for all other modules. Which module-info.java declaration meets the requirement?

Given: ```java public interface ExampleInterface { } ``` Which two statements are valid to be written in this interface? (Choose two.)

Given: ```java public static void main(String[] args) { for (int i = 0; i < args.length; i++) { System.out.println(i + ": " + args[i]); switch (args[i]) { case "one": continue; cas...

Given: ```java public interface Builder { public A build(String str); } ``` and ```java public class BuilderImpl implements Builder { @Override public B build(String str) { return...

Given: ```java public class Sportscar extends Automobile { private float turbo; public void setTurbo (float turbo) { this.turbo = turbo; } } ``` What is known about the Sportscar c...

Given: ```java public interface A { a(); } public interface B extends A { b(); } public interface C extends A { public Path c(); } public interface D extends B, C { } ``` Why does...

Given: ```java package test; import java.time.*; public class Diary { private LocalDate now = LocalDate.now(); public LocalDate getDate() { return now; } } ``` and ```java package...

Given: ```java package A; class Test { String name; public Test (String name) { this.name = name; } public String toString() { return name; } } ``` and ```java package B; import A....

Given: ```java List<String> list = ...; list.forEach(x -> { System.out.println(x); }); ``` What is the type of x?

Given this code fragment: ```java String s = ""; if (Double.parseDouble("11.00F") > 11) { s += 1; } if (1 == Integer.valueOf("17")) { s += 2; } if (1024 > 1023L) { s += 3; } System...

Given: public class Foo { public void foo(Collection arg) { System.out.println("Bonjour le monde!"); } } and public class Bar extends Foo { public void foo(Collection arg) { System...

Given: public class Person { private String name = "Joe Bloggs"; public Person(String name) { this.name = name; } public String toString() { return name; } } and public class Teste...

Given: public class DMASynth { int aCount; int tCount; int cCount; int gCount; int getAcount(int xCount){ return aCount; } int getTcount(int tcount){ return this.tCount; } int getC...

Given: public class Main { public static void checkConfiguration(String filename) { File file = new File(filename); if(!file.exists()) { throw new Error("Fatal Error: Configuration...

Which statement is true about the Fox class?

Given: Automobile.java public abstract class Automobile { //line 1 abstract void wheels(); } Car.java public class Car extends Automobile { void wheels(int i) { // line 2 System.ou...

Given: /code/a/Test.java containing: package a; import b.Best; public class Test { public static void main(String[] args) { Best b = new Best(); } } and /code/b/Best.java containin...

Examine this excerpt from the declaration of the java.se module: module java.se { requires transitive java.sql; ... } What does the transitive modifier mean?

Given: public class Person { private String name; public Person(String name) { this.name = name; } public String toString() { return name; } } and public class Tester { public stat...

Given: class Super { static String greeting() { return "Good Night"; } String name() { return "Harry"; } } and class Sub extends Super { static String greeting() { return "Good Mor...

Given: 1. public class Main { 2. public static void greet(String... args) { 3. System.out.print("Hello "); 4. for (String arg : args) { 5. System.out.println(arg); 6. } 7. } 8. pub...

Given: for (var i = 0; i < 10; i++) { switch(i%5) { case 2: i+=3; break; case 1: i++; break; case 3: i++; continue; default: break; } System.out.print(i + " "); i++; } What is the...

What makes Java dynamic?

Given the code fragment: Path currentFile = Paths.get("/scratch/exam/temp.txt"); Path outputFile = Paths.get("/scratch/exam/new.txt"); Path directory = Paths.get("/scratch/"); File...

Given the declaration: @interface Resource { String name(); int priority() default 0; } Examine this code fragment: /* Loc1 */ /* class ProcessOrders { ... } Which two annotations...

Given interface MyInterface1 { public int method1() throws Exception; private void pMethod() { /* an implementation of pMethod */ } } interface MyInterface2 { public static void sM...

Given this enum declaration: 1. enum Alphabet { 2. A, B, C 3. } 4. Examine this code: System.out.println(Alphabet.getFirstLetter()); What line should be written at line 3 to make t...

Given the two classes: public class Resource { public Worker owner; public synchronized boolean claim(Worker worker) { if (owner == null) { owner = worker; return true; } else retu...

Given: public interface TestInterface { default public void samplingProbeProcedure() { probeProcedure(); System.out.println("Collect Sample"); System.out.println("Leave Asteroid");...

Given: public class Main { public static void main(String[] args) { Thread t1 = new Thread(new MyThread()); Thread t2 = new Thread(new MyThread()); Thread t3 = new Thread(new MyThr...

Which code fragment does a service use to load the service provider with a Print interface?

Examine these module declarations: module ServiceAPI { exports com.example.api; } module ServiceProvider { requires ServiceAPI; provides com.example.api with com.myimp1.imp1; } mod...

Given: public class Main { public static void main(String[] args) { String str = Value.orElse("Duke"); System.out.println(str); } static Optional<String> createValue() { String s =...

Given 1. public class Test { 2. private static class Greet { 3. private void print() { 4. System.out.println("Hello World"); 5. } 6. } 7. public static void main(String[] args) { 8...

Assume db is a DataSource and the EMP table is defined appropriately. try (Connection conn = ds.getConnection(); PreparedStatement ps = conn.prepareStatement("INSERT INTO EMP VALUE...

Assuming that Widget class has a getPrice method t is code does not compile: List widgets = List.of( new Widget("Basic Widget", 19.55), // line 1 new Widget("Enhanced Widget", 35.0...

Given var numbers = List.of(1,2,3,4,5,6,7,8,9,10); for(int a: numbers){ StringBuilder sb = new StringBuilder(); sb.append(a); sb.append(""); system.out.println(sb.toString()); } Wh...