Oracle Java Programming Certification Questions and Answers (Dumps and Practice Questions)
Question :You have been given following code
public class Student {
public String name = "";
public int age = 0;
public String major = "Undeclared";
public boolean fulltime = true;
public void display() {
System.out.println("Name: " + name + " Major: " + major);
}
public boolean isFullTime() {
return fulltime;
}
}
Which line of code initializes a student instance?
1. Student student1;
2. Student student1 = Student.new();
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4. Student student1 = Student();
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Question : Which of the following will print current time?
1. System.out.print(new LocalTime()-now);
2. System.out.print(new LocalTime());
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4. System.ouLprint(LocalTime.today());
5. None of the above.
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Explanation: The LocalTime is an interface, so we can't use new keyword with them. So options A and C
are incorrect. To get current time we can call now method on LocalTime interface. So option
C is correct. Option D is incorrect as there is no method called today as in LocalTime
interface
Question : Given the code fragment:
String name = "Spot";
int age = 4;
String str ="My dog " + name + " is " + age;
System.out.println(str);
And
StringBuilder sb = new StringBuilder();
Using StringBuilder, which code fragment is the best potion to build and print the following string
My dog Spot is 4
A. sb.append("My dog " + name + " is " + age);
System.out.println(sb);
B. sb.insert("My dog ").append( name + " is " + age);
System.out.println(sb);
C. sb.insert("My dog ").insert( name ).insert(" is " ).insert(age);
System.out.println(sb);
D. sb.append("My dog ").append( name ).append(" is " ).append(age);
System.out.println(sb);
1. A,B
2. B,C
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4. A,D
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Related Questions
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?
1. ArrayList
myList1.add(new Tiger());
2. ArrayList
myList2.add(new Cat());
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myList3.add(new Tiger());
4. ArrayList
myList4.add(new Cat());
5. ArrayList
myList.add(new Cat());
Question : 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.
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
Question : You have been given below code
public class Triangle {
static double area;
int b = 2, h = 3;
public static void main(String[] args) {
double p, b, h; // line n1
if (area == 0) {
b = 3;
h = 4;
p = 0.5;
}
area = p * b * h; // line n2
System.out.println("Area is " + area);
}
}
What is the result?
1. Area is 6.0
2. Area is 3.0
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4. Compilation fails at line n2
Question : Given the code fragment:
public class Test {
public static void main(String[] args) {
// line n1
switch (x) {
case 1:
System.out.println("One");
break;
case 2:
System.out.println("Two");
break;
}
}
}
Which three code fragments can be independently inserted at line nl to enable the code to print one?
A. Byte x = 1;
B. short x = 1;
C. String x = "1";
D. Long x = 1;
E. Double x = 1;
F. Integer x = new Integer ("1");
1. A,B,F
2. C,D,E
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4. D,E,F
Question : You have been given below code, what would be printed when you run it.
public class App {
public static void main(String[] args) {
Boolean[] bool = new Boolean[2];
bool[0] = new Boolean(Boolean.parseBoolean("true"));
bool[1] = new Boolean(null);
System.out.println(bool[0] + " " + bool[1]);
}
}
1. True false
2. True null
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4. A NullPointerException is thrown at runtime