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Oracle Java Programming Certification Questions and Answers (Dumps and Practice Questions)



Question : Given the code fragment:

public static void main(String[] args){
String date = LocalDate.parse("2014-05-04").format(DateTimeFormatter.ISo_DATE_TIME);
System.out.println(date);
}

What is the result?


: Given the code fragment:
1. May 04, 2014T00:00:00.000
2. 2014-05-04T00:00: 00. 000
3. 5/4/14T00:00:00.000
4. An exception is thrown at runtime.



Correct Answer : 4






Question : Given the code fragment:

if(aVar++ <10){
System.out.println(aVar + " Hello World!");
}else{
System.out.println(aVar + " Hello Universe!");
}

What is the result if the integer aVar is 9?


: Given the code fragment:
1. Hello World!
2. Hello Universe!
3. Hello World
4. Compilation fails.



Correct Answer : 1
Explanation:







Question : Given

What is the result?


: Given
1. 200.0 : 100.0
2. 400.0 : 200.0
3. 400.0 : 100.0
4. Compilation fails.




Correct Answer : 3




Related Questions

Question : You have been given following three classes as below.'

A.java

public class A {
public void a(){}
int a;
}

B.java

public class A {
public void a(){}
int a;
}

C.java
import java.io.*;
package p1;

class A {
public void main(String filename) throws IOException {}
}

Which of the follwing statement is true, with regards to above code.

 : You have been given following three classes as below.'
1. Only the A.Java file compiles successfully.
2. Only the B.java file compiles successfully
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4. The A.Java and B.java files compile successfully
5. The B.java and C.java files compile successfully.



Question : Given the code fragment:
int[] array = {I, 2, 3, 4, 5};

And given the requirements:
1. Process all the elements of the array in the order of entry.
2. Process all the elements of the array in the reverse order of entry.
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Which two statements are true?

A. Requirements 1, 2, and 3 can be implemented by using the enhanced for loop.
B. Requirements 1, 2, and 3 can be implemented by using the standard for loop.
C. Requirements 2 and 3 CANNOT be implemented by using the standard for loop.
D. Requirement 1 can be implemented by using the enhanced for loop.
E. Requirement 3 CANNOT be implemented by using either the enhanced for loop or the standard for loop.

: Given the code fragment:
1. B,D
2. A,E
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4. C,E




Question : You have been given below java Application code, when you execute it. What would be printed.

public class CalculationApp {
public static void main(String[] args) {
int var1 =200;
System.out.print(doCalc(var1));
System.out.println(" "+ var1);
}

static int doCalc(int var1){
var1= var1*2;
return var1;

}
}

 : You have been given below java Application code, when you execute it. What would be printed.
1. 400 200
2. 200 200
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4. Compilation fails.




Question : You have been given below declarations:

public abstract class Animal
public interface Hunter
public class Cat extends Animalimplements Hunter
public class Tiger extends Cat

Which answer fails to compile?

 : You have been given below declarations:
1. ArrayList myList1 = new ArrayList<>();
myList1.add(new Tiger());
2. ArrayList myList2 = new ArrayList<>();
myList2.add(new Cat());
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myList3.add(new Tiger());
4. ArrayList myList4 = new ArrayList<>();
myList4.add(new Cat());
5. ArrayList myList = new ArrayList<>();
myList.add(new Cat());





Question : Which statement is true about Java byte code?
 : Which statement is true about Java byte code?
1. It can run on any platform.
2. It can run on any platform only if it was compiled for that platform.
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4. It can run on any platform that has a Java compiler.
5. It can run on any platform only if that platform has both the Java Runtime Environment and a Java compiler.






Question :

public class MarkList {
int num;

public static void graceMarks(MarkList obj4) {
obj4.num += 10;
}

public static void main(String[] args) {
MarkList obj1 = new MarkList();
MarkList obj2 = obj1;
MarkList obj3 = null;
obj2.num = 60;
graceMarks(obj2);
}
}

How many MarkList instances are created in memory at runtime?

 :
1. 1
2. 2
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4. 4