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Oracle Certification

Java SE 7 Programmer I - Sample Questions

Sample Questions

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Sample questions are provided solely to familiarize candidates with the multiple-choice format and writing style of questions that will be found on the exam. Sample questions may not cover the full spectrum of difficulty that is covered by the exam questions. Success on the sample questions does not predict success on the exam..

1. Given:

import java.io.*;
class MyResource1 implements AutoCloseable {
    public void close()throws IOException{ // A1
        System.out.print("1 "); }
}
class MyResource2 implements Closeable {
    public void close()throws Exception { // A2
        System.out.print("2 "); }
}
public class Triangle {
    public static void main(String[] args) throws IOException{
        try ( MyResource1 r1 = new MyResource1(); // B1
            MyResource2 r2 = new MyResource2();) { // B2
            System.out.print("t ");
        }
        finally {
            System.out.print("f ");
        }
    }
}

What is the result?
A) t 2 1 f
B) t 1 2 f 
C) Compilation fails due to errors on lines A1 and B1.
D) Compilation fails due to errors on lines A2 and B2.

2. Given:

import java.util.*;
public class Forever {
   public static void main(String[] args) {
       List x1 = new ArrayList();
       List x2 = new ArrayList<>();
   }
}

What happens when you compile the code? ?
A) Compilation succeeds.
B) Compilation fails due to multiple errors
C) Compilation fails due to an error on line 4.
D) Compilation fails due to an error on line 5.

3.Which is most closely associated with the object-oriented design concept known as "has-a"?
A) DAO
B) factory
C) adapter
D) composition

4. Given:

import java.util.*;
public class MyDates {
    public static void main(String[] args) {
        Calendar c = Calendar.getInstance(); // Line A
    }
}
Which two statements are true?
A) Line A is an example of using the DAO pattern.
B) Line A is an example of using the factory pattern.
C) Line A is an example of using the singleton pattern.
D) java.util.Calendar could be an abstract class.
E) Line A could be replaced with: Calendar c = new Calendar();

5. Which method can be used for establishing a connection to a JDBC 4.1 data source?
A) Class.getConnection()
B) DriverManager.forName()
C) DriverManager.getConnection()
D) DriverManager.registerDriver()

6. Given this code fragment:
// assume "myURL" is a valid URL
// assume that the initial value of a saving account is 0
try {
   Connection conn = DriverManager.getConnection(myURL);
   Statement s = conn.createStatement();
   // execute SQL to add 100 to the account
   // execute more SQL to add 300 to the account
   conn.commit();
} catch (Exception e) {
   e.printStackTrace();
}
What is the result?
A) An exception is thrown at runtime
B) The account's value is not changed
C) The account's value is incremented by 300
D) The account's value is incremented by 400


7. Implementing which method will properly extend java.util.ListResourceBundle?
A) getContents()
B) addResources()
C) getBundle()
D) getKeys()

Answers

1. D
2. A
3. D
4. B, D
5. C
6. D
7. A