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Home Oracle 1z0-804

Oracle 1z0-804 Exam Practice Questions (P. 1)

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Question #1
Given:

Which three values will appear in the output?
  1. A
    5
  2. B
    7
  3. C
    a1
  4. D
    a2
  5. E
    b1
  6. F
    b2 ADE

Correct Answer:
Explanation
Static method of base class is invoked >>
A myA = new B();
System.out.print(myA.doA() + myA.doA2() + myA.a);
class B String doA() { return "b1 "; }
class A protected static String doA2 () { return "a2 "; }
class B int a = 7;

Question #2
Given:

What is the result?
  1. A
    false false
  2. B
    true false
  3. C
    true true
  4. D
    Compilation fails
  5. E
    An exception is thrown at runtime

Correct Answer:
A
(this == obj) is the object implementation of equals() and therefore FALSE, if the reference points to various objects and then the super.equals() is invoked, the object method equals() what still result in FALSE better override of equals() is to compare the attributes like: public boolean equals (Object obj) { if (obj != null){
Product p = (Product)obj;
return this.id == p.id;
}
return false;
}

Question #3
Given:

What is the result?
  1. A
    tolting cantering tolting
  2. B
    cantering cantering cantering
  3. C
    compilation fails
  4. D
    an exception is thrown at runtime

Correct Answer:
C
Compiler says: Cannot reduce the visibility of the inherited method from Rideable. mssen PUBLIC sein public String ride() { return "cantering "; } public String ride() { return "tolting "; } if this is given then the result would be:
A : tolting cantering tolting

Question #4
Which four are syntactically correct?
  1. A
    package abc; package def; import Java.util . * ; public class Test { }
  2. B
    package abc; import Java.util.*; import Java.util.regex.* ; public class Test { }
  3. C
    package abc; public class Test {} import Java.util.* ;
  4. D
    import Java.util.*; package abc; public class Test {}
  5. E
    package abc; import java.util. *; public class Test{}
  6. F
    public class Test{} package abc; import java.util.*{}
  7. G
    import java.util.*; public class Test{}
  8. H
    package abc; public class test {}

Correct Answer:
BEGH

Question #5
Given these facts about Java types in an application:
- Type x is a template for other types in the application.
- Type x implements dostuff ().
- Type x declares, but does NOT implement doit().
- Type y declares doOther() .
Which three are true?
  1. A
    Type y must be an interface.
  2. B
    Type x must be an abstract class.
  3. C
    Type y must be an abstract class.
  4. D
    Type x could implement or extend from Type y.
  5. E
    Type x could be an abstract class or an interface.
  6. F
    Type y could be an abstract class or an interface.

Correct Answer:
BDF
Unlike interfaces, abstract classes can contain fields that are not static and final, and they can contain implemented methods. Such abstract classes are similar to interfaces, except that they provide a partial implementation, leaving it to subclasses to complete the implementation. If an abstract class contains only abstract method declarations, it should be declared as an interface instead.
Note:
An interface in the Java programming language is an abstract type that is used to specify an interface (in the generic sense of the term) that classes must implement. Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final). An interface may never contain method definitions.
Note 2: an abstract class is a class that is declared abstract--it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. An abstract method is a method that is declared without an implementation (without braces, and followed by a semicolon)

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