Oracle 1z0-809 Certification All-in-One Exam Guide Sep-2023
Get Real 1z0-809 Exam Dumps [Sep-2023] Practice Tests
NEW QUESTION # 103
Given the code fragment:
What is the result?
- A. 1 2 3
- B. 1 2 3 4
- C. 1 2 3 4
followed by an ArrayIndexOutOfBoundsException - D. Compilation fails.
Answer: A
NEW QUESTION # 104
Given:
public enum USCurrency {
PENNY (1),
NICKLE(5),
DIME (10),
QUARTER(25);
private int value;
public USCurrency(int value) {
this.value = value;
}
public int getValue() {return value;}
}
public class Coin {
public static void main (String[] args) {
USCurrency usCoin =new USCurrency.DIME;
System.out.println(usCoin.getValue()):
}
}
Which two modifications enable the given code to compile? (Choose two.)
- A. Nest the USCurrency enumeration declaration within the Coin class.
- B. Add the final keyword in the declaration of value.
- C. Make the USCurrency enumeration constructor private.
- D. Make the getter method of value as a static method.
- E. Remove the new keyword from the instantion of usCoin.
Answer: C,E
NEW QUESTION # 105
For which three objects must a vendor provide implementations in its JDBC driver?
- A. Date
- B. Connection
- C. DriverManager
- D. SQLException
- E. Time
- F. ResultSet
- G. Statement
Answer: B,F,G
Explanation:
Database vendors support JDBC through the JDBC driver interface or through the ODBC connection. Each driver must provide implementations of java.sql.Connection, java.sql.Statement, java.sql.PreparedStatement, java.sql.CallableStatement, and java.sql.Re sultSet. They must also implement the java.sql.Driver interface for use by the generic java.sql.DriverManager interface.
NEW QUESTION # 106
Which statement is true about the single abstract method of the java.util.function.Function interface?
- A. It accepts one argument and returns boolean.
- B. It accepts one argument and returns void.
- C. It accepts an argument and produces a result of any data type.
- D. It accepts one argument and always produces a result of the same type as the argument.
Answer: D
Explanation:
Explanation/Reference:
Reference: http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)
NEW QUESTION # 107
Given the code fragment:
Which code fragment, when inserted at line n1, ensures false is printed?
- A. boolean b = cs.stream() .anyMatch (w -> w.equals ("Java"));
- B. boolean b = cs.stream() .findAny() .get() .equals("Java");
- C. boolean b = cs.stream() .allMatch(w -> w.equals("Java"));
- D. boolean b = cs.stream() .findFirst() .get() .equals("Java");
Answer: D
NEW QUESTION # 108
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs because the tryblock doesn't have a catchor finallyblock.
- B. A compilation error occurs at line n2.
- C. The program compiles successfully.
- D. A compilation error occurs at line n1.
Answer: A
NEW QUESTION # 109
Given the code fragments:
What is the result?
- A. Compilation fails at line n2
- B. Contract
Contract
Super - C. Compilation fails at line n1
- D. Super
Sub
Sub
Answer: D
NEW QUESTION # 110
Given the code fragments:
What is the result?
- A. Compilation fails only at line n2.
- B. Too1 :: export
Too1 :: export - C. Compilation fails at both line n1 and line n2.
- D. RToo1 :: export
Too1 :: export - E. Compilation fails only at line n1.
Answer: E
NEW QUESTION # 111
Given the code fragment:
Path source = Paths.get ("/data/december/log.txt");
Path destination = Paths.get("/data");
Files.copy (source, destination);
and assuming that the file /data/december/log.txt is accessible and contains:
10-Dec-2014 - Executed successfully
What is the result?
- A. A FileNotFoundException is thrown at run time.
- B. A file with the name log.txt is created in the /data directory and the content of the /data/december/log.txt
file is copied to it. - C. The program executes successfully and does NOT change the file system.
- D. A FileAlreadyExistsException is thrown at run time.
Answer: D
NEW QUESTION # 112
For which three objects must a vendor provide implementations in its JDBC driver?
- A. Date
- B. Connection
- C. DriverManager
- D. SQLException
- E. Time
- F. ResultSet
- G. Statement
Answer: B,F,G
Explanation:
Explanation
Database vendors support JDBC through the JDBC driver interface or through the ODBC connection. Each driver must provide implementations of java.sql.Connection, java.sql.Statement, java.sql.PreparedStatement, java.sql.CallableStatement, and java.sql.Re sultSet. They must also implement the java.sql.Driver interface for use by the generic java.sql.DriverManager interface.
NEW QUESTION # 113
Given the code fragment:
List<String> str = Arrays.asList ("my", "pen", "is", "your', "pen");
Predicate<String> test = s -> {
int i = 0;
boolean result = s.contains ("pen");
System.out.print(i++) + ":");
return result;
};
str.stream()
.filter(test)
.findFirst()
.ifPresent(System.out ::print);
What is the result?
0 : 0 : pen
- A.
- B. 0 : 0 : 0 : 0 : 0 : pen
- C. A compilation error occurs.
- D. 0 : 1 : pen
- E. 0 : 1 : 2 : 3 : 4 :
Answer: D
Explanation:
Explanation/Reference:
NEW QUESTION # 114
Given the code fragment:
What is the result?
- A.
- B. A compilation error occurs at line n2.
- C. A compilation error occurs at line n1.
courseJava - D. Javacourse
Answer: C
NEW QUESTION # 115
Given the code fragment:
List<String> codes = Arrays.asList ("DOC", "MPEG", "JPEG");
codes.forEach (c -> System.out.print(c + " "));
String fmt = codes.stream()
.filter (s-> s.contains ("PEG"))
.reduce((s, t) -> s + t).get();
System.out.println("\n" + fmt);
What is the result?
- A. DOC MPEG JPEGMPEGJPEG
- B. DOC MPEG MPEGJPEGMPEGMPEGJPEG
- C. MPEGJPEGMPEGJPEG
- D. The order of the output is unpredictable.
Answer: A
NEW QUESTION # 116
Given the code fragment:
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWordexists The Employeetable has a column ID of type integer and the SQL query matches one record.
What is the result?
- A. Compilation fails at line 15.
- B. The code prints Error.
- C. The code prints the employee ID.
- D. Compilation fails at line 14.
Answer: D
NEW QUESTION # 117
Given the definition of the Emp class:
public class Emp
private String eName;
private Integer eAge;
Emp(String eN, Integer eA) {
this.eName = eN;
this.eAge = eA;
}
public Integer getEAge () {return eAge;}
public String getEName () {return eName;}
}
and code fragment:
List<Emp>li = Arrays.asList(new Emp("Sam", 20), New Emp("John", 60), New Emp("Jim", 51)); Predicate<Emp> agVal = s -> s.getEAge() <= 60;//line n1 li = li.stream().filter(agVal).collect(Collectors.toList()); Stream<String> names = li.stream()map.(Emp::getEName);//line n2 names.forEach(n -> System.out.print(n + " ")); What is the result?
- A. A compilation error occurs at line n1.
- B. Sam John Jim
- C. A compilation error occurs at line n2.
- D. John Jim
Answer: A
NEW QUESTION # 118
......
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