1Z0-854
Oracle
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Question: 1 Given: public class CreditCard { private String cardID; private Integer limit; public String ownerName; public void setCardInformation(String cardID, String ownerName, Integer limit) { this.cardID = cardID; this.ownerName = ownerName; this.limit = limit; } } Which statement is true? A. The ownerName variable breaks encapsulation. B. The class is fully encapsulated. C. The cardID and limit variables break polymorphism. D. The code demonstrates polymorphism. E. The setCardInformation method breaks encapsulation.
Answer: A
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Question: 4 Which three statements concerning the use of the java.io.Serializable interface are true? (Choose three.) A. Objects from classes that use aggregation cannot be serialized. B. The values in fields with the transient modifier will NOT survive serialization and deserialization. C. It is legal to serialize an object of a type that has a supertype that does NOT implement java.io.Serializable. D. The values in fields with the volatile modifier will NOT survive serialization and deserialization. E. An object serialized on one JVM can be successfully deserialized on a different JVM.
Answer: B,C,E
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Question: 5 Which two code fragments will execute the method doStuff() in a separate thread? (Choose two.) A. new Thread() { public void start() { doStuff(); } }; B. new Thread() { public void run() { doStuff(); } }; C. new Thread(new Runnable() { public void run() { doStuff(); } }).start(); D. new Thread() { public void start() { doStuff(); } }.run(); E. new Thread(new Runnable() { public void run() { doStuff(); } }).run(); F. new Thread() { public void run() { doStuff(); } }.start();
Answer: C,F Question: 6 Given: import jav a.io.*; public class Forest implements Serializable { private Tree tree = new Tree(); public static void main(String [] args) { Forest f = new Forest(); try { FileOutputStream fs = new FileOutputStream("Forest.ser"); ObjectOutputStream os = new ObjectOutputStream(fs); os.writeObject(f); os.close(); } catch (Exception ex) { ex.printStackTrace(); } }} class Tree { } What is the result? A. An exception is thrown at runtime. B. An instance of Forest is serialized. C. An instance of Forest and an instance of Tree are both serialized. D. Compilation fails.
Answer: A
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Question: 7 Given: interface TestA { String toString(); } public class Test { public static void main(String[] args) { System.out.println(new TestA() { public String toString() { return "test"; } }); } } What is the result? A. null B. An exception is thrown at runtime. C. Compilation fails because of an error in line 5. D. Compilation fails because of an error in line 4. E. Compilation fails because of an error in line 1. F. test
Answer: F
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Question: 9 Given: public class Boxer1{ Integer i; int x; public Boxer1(int y) { x = i+y; System.out.println(x); } public static void main(String[] args) { new Boxer1(new Integer(4)); } } What is the result? A. Compilation fails because of an error in line 5. B. A NullPointerException occurs at runtime. C. Compilation fails because of an error in line 9. D. A NumberFormatException occurs at runtime. E. The value "4" is printed at the command line. F. An IllegalStateException occurs at runtime.
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Answer: B Question: 10 Given: 10: public class Hello { 11: String title; 12: int value; 13: public Hello() { 14: title += " World"; 15: } 16: public Hello(int value) { 17: this.value = value; 18: title = "Hello"; 19: Hello(); 20: } 21: } and: 30: Hello c = new Hello(5); 31: System.out.println(c.title); A. The code runs with no output. B. Hello C. Hello World 5 D. Compilation fails. E. An exception is thrown at runtime. F. Hello World What is the result?
Answer: D
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Oracle
1Z0-854
Java Standard Edition 5 Programmer Certified Professional Upgrade
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