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

Question : Given:

Which statement is true?

1. Both p and s are accessible by obj.
2. only s is accessible by obj.
3. Both r and s are accessible by obj.
4. p, r, and s are accessible by obj.

Correct Answer : 2
Explanation:

p is not public in p1.Acc; cannot be accessed from outside package
r has protected access in p1.Acc







Question : You are developing a banking module.
You have developed a class
named ccMask that has a maskcc method.

Given the code fragment as shown in image:

1. A,B
2. B,C
3. C,D
4. A,D



Correct Answer : 2

Explanation:
option A : In this we are doing substring for StringBuilder instance, however not using returned string. Hence, result will be mask string + entire credit card number.
option B : We are concatenation mask string and last 4 digists. Hence, will return correct result.
option C : We have used append method of StringBuilder class to append mask string and last 4 digits. It will work perfectly.
option D : It will append both entire mask string and full credit card number. (Hence, not a correct solution)







Question : Given the following code:


public static void main(String args[]){

String[] planets = {"Mercury" , "Venus", "Earth" , "Mars"};

System.out.println(planets.length);
System.out.println(planets[1].length());
}

What is the output?




1. 4

2. 3

3. 4

4. 4

5. 4



Correct Answer : 4
Explanation: First print statement will print the size of array, which is 4 and second print statement will print size of second element in array which is "Venus"
which is 5

Related Questions

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Question : Given the code fragment. What is the result?

1. 10 : 10
2. 5 : 5
3. 5 : 10

4. Compilation fails




Question : Given the code fragment:

7. StringBuilder sb1 = new StringBuilder("Duke");
8. String str1 = sb1.toString();
9. //Insert code here
10. System.out.println(str1==str2);

Which code fragment, when inserted at line 9, enables the code to print true?


1. String str2 = str1;
2. String str2 = newString (str1);
3. String str2 =sb1. toString ();
4. String str2 = "Duke";




Question : Given the code fragment: Assume that the system date is June , . What is the result?

LocalDate date1 = LocalDate.now();
LocalDate date2 = LocalDate.of(2014,6,20);
LocalDate date3 = LocalDate.parse("2014-06-20", DateTimeFormatter.ISo_DATE);
System.out.println("date1 = " + date1);
System.out.println("date2 = " + date2);
System.out.println("date3 = " + date3);


1.
date1=2014-06-20
date2=2014-06-20
date3=2014-06-20
2.
date1=06/20/2014
date1=2014-06-20
date1=Jun 20, 2014
3. Compilation Fails
4. A DateParseException is thrown at runtime.



Question : Given the code fragment: What is the result?

public static void main(String args[]){
int ii=0;
int jj=7;
for(ii=0; ii System.out.print(ii + " ");
}


1. 2 4
2. 0 2 4 6
3. 0 2 4
4. Compilation Fails




Question : Given: What is the result?

1. ns = 50 s =125
ns = 125 s = 125
ns = 100 s = 125
2. ns = 50 s =125
ns = 125 s = 125
ns = 0 s = 125
3. ns = 50 s =50
ns = 125 s = 125
ns = 100 s = 100
4. ns = 50 s =50
ns = 125 s = 125
ns = 0 s = 125





Question : Given the code from the Greeting.Java file:

public class Greeting {
public static void main(String args[]){
System.out.println("Hello " + args[0]);
}
}

Which set of commands prints Hello Duke in the console?


1. javac Greeting
java Greeting Duke
2. javac Greeting.java Duke
java Greeting
3. javac Greeting.java
java Greeting Duke
4. javac Greeting.java
java Greeting.class Duke