Oracle Advacned Java Advanced Certification Questions and Answers (Dumps and Practice Questions)
Question : You have been given below code, what is the behavior expected?
package com.hadoopexam;
import java.nio.file.FileAlreadyExistsException;
class Welcome {
@SuppressWarnings("finally")
public static void call() throws Exception {
try {
throw new FileAlreadyExistsException(null);
} finally {
throw new Exception();
}
}
public static void main(String[] args) {
try {
call();
} catch (Throwable throwable) {
System.out.println(throwable);
}
}
}
1. It will not compile
2. It will compile and run with Throwable
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4. It will compile and run with no output
5. It will compile and run with FileAlreadyExistsException
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Explanation: : As you know, finally will be executed which will create an object of Exception class which will be catched in main method. Using dynamic binding it will
use actual type of Object. Hence, it will print Exception
Question : You have been given following code, what is the behavior expected
package com.hadoopexam;
import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
class Welcome {
public static void main(String[] args) {
LocalDate date1 = LocalDate.of(2014, Month.MARCH, 01);
LocalDate date2 = LocalDate.of(2016, Month.NOVEMBER, 01);
System.out.println(Period.between(date2, date1).getYears());
}
}
1. It will give compile time error
2. It will compile and run perfectly and print 1
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4. It will compile and run perfectly and print -1
5. It will compile and run perfectly and print -2
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Explanation: As you know, when we are using between method of Period class, it should have been used like between(start date, end date) . Here we are using in reverse
order hence, it will give -2 instead of 2.
Question : Which one of the following classes is best suited for storing timestamp values of application events in a file?
1. java.time.ZoneId class
2. java.time.ZoneOffset class
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4. java.time.Duration class
5. java.time.Period class
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Explanation: The Instant class stores the number of seconds elapsed since the start of the Unix epoch (1970-01-01T00:00:00Z). The Instant class is suitable for storing a
log of application events in a file as timestamp values.
The ZoneId and ZoneOffset classes are related to time zones and hence are unrelated to storing timestamp values. The Duration class is for time-based values in terms of quantity of
time (such as seconds, minutes, and hours). The Period class is for date-based values such as years, months, and days.
Related Questions
Question : Which one of the following abstract methods does not take any argument but returns a value?
1. The accept() method in java.util.function.Consumer
2. The get() method in java.util.function.Supplier
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4. The apply() method in java.util.function.Function
Question : You have been given following code. What is the behavior you expect?
package com.hadoopexam;
import java.util.function.Predicate;
public class Welcome {
public static void main(String args[]) {
Predicate
checkString(checkValue, "Quick");
}
static void checkString(Predicate
System.out.println(predicate.test(str) ? "It has given String" : "It does not have given String"); //n2
}
}
1. There will be a compile time error at n1, because you cannot have a method reference with an Object.
2. There will be a compile time error at n2.
4. Program will compile and run as well and print "It does not have given String"
Question : What would happen, if you use below code.
package com.hadoopexam;
import java.util.function.Predicate;
import java.util.function.ObjIntConsumer;
class Welcome {
public static void main(String[] args) {
ObjIntConsumer
System.out.println(charAt.accept("java", 2)); // n2
}
}
1. There will be a compile time error at line n1
2. There will be a compile time error at line n2
4. There will be no error, it runs perfectly and print v
Question : You have been given below code. What is the expected behavior ?
package com.hadoopexam;
class Welcome {
public static void main(String[] args) {
"HadoopExam.com".chars().distinct().peek(ch -> System.out.printf("%c ", ch)).sorted();
}
}
1. Code will through a compile time error.
2. Code will run perfectly and print "H a d o p E x m . c"
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4. Code will run perfectly and print ". a c d m o p x E H "
Question : You have been given below code, what is the expected behavior?
package com.hadoopexam;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.stream.Stream;
public class Welcome {
public static void main(String[] args) throws IOException {
Stream
userHomes.forEach (fName ->
{//line n1
try
{
Path aPath = fName.toAbsolutePath();//line n2
System.out.println(fName + ":" + Files.readAttributes(aPath, BasicFileAttributes.class).creationTime());
} catch (IOException ex)
{
ex.printStackTrace();
}
});
}
}
1. All files and directories under thehomedirectory are listed along with their attributes.
2. A compilation error occurs atline n1.
4. A compilation error occurs atline n2.
Question : You have been given below code, what is the behavior expected?
package com.hadoopexam;
import java.util.Set;
import java.util.TreeSet;
public class Welcome {
int userId;
String userName;
public Welcome(int userId, String userName) {
this.userId = userId;
this.userName = userName;
}
public String toString() {
return userId + ":" + userName;
}
public static void main(String[] args) {
Set
users.add(new Welcome (101, "Amit"));
users.add(new Welcome (102, "Anurag"));
System.out.println(users);
}
}
1. 101 : Amit , 102:Anurag
2. 102 : Anurag , 102: Amit
4. It will give compile time error.
5. It will give runtime error "java.lang.ClassCastException: com.hadoopexam.Welcome cannot be cast to java.lang.Comparable"