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

Question : You have been given two separate classes as below.

public class MyException extends RuntimeException { }

public class Test {
public static void main(String[] args) {
try {
method1();
} catch (MyException ne) {
System.out.print("A");
}
}

public static void method1() { // line n1
try {
throw Math.random() > 0.5 ? new MyException()
: new RuntimeException();
} catch (RuntimeException re) {
System.out.print("B");
}
}
}

What is the result?


1. A
2. B
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4. AB
5. A compile time error occurs at line n1




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Question : You have been given Java Application as below code

public class App {
String myStr = "7007";

public void doStuff(String str) {
int myNum = 0;
try {
String myStr = str;
myNum = Integer.parseInt(myStr);
} catch (NumberFormatException ne) {
System.err.println("Error");
}
System.out.println("myStr: " + myStr + ", myNum: " + myNum);
}

public static void main(String[] args) {
App obj = new App();
obj.doStuff("9009");
}
}

What happen/print, when you execute this code ?


1. myStr: 9009, myNum: 9009
2. myStr: 7007, myNum: 7007
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4. Compilation fails




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Explanation:




Question : Which two are benefits of polymorphism?
A. Faster code at runtime
B. More efficient code at runtime
C. More dynamic code at runtime
D. More flexible and reusable code
E. Code that is protected from extension by other classes


1. A,B
2. B,C
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4. C,D
5. A,E



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Related Questions

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Question : You have been given following code

class StaticField {
static int i = 7;

public static void main(String[] args) {
StaticField obj = new StaticField();
obj.i++;
StaticField.i++;
obj.i++;
System.out.println(StaticField.i + " " + obj.i);
}
}

what would be printed ?



1. 10 10
2. 8 9
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4. 7 10




Question : Which declaration initializes a boolean variable?


1. boolean h = 1;
2. boolean k = 0;
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4. boolean j = (1 < 5);




Question : Which two are Java Exception classes?
A. SercurityException
B. DuplicatePathException
C. IllegalArgumentException
D. TooManyArgumentsException


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




Question : What is the proper way to defined a method that take two int values and returns their sum as an int value?


1. int sum(int first, int second) { first + second; }
2. int sum(int first, second) { return first + second; }
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4. int sum(int first, int second) { return first + second; }

5. void sum (int first, int second) { return first + second; }




Question : You have been given following code

public class MyClass {
public static void main(String[] args) {
String s = " Java Duke ";
int len = s.trim().length();
System.out.print(len);
}
}

What is the result?

1. 8
2. 9
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4. 10
5. Compilation fails




Question : You have been given following code

public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass();
SampleClass sc = new SampleClass();
sc = asc;
System.out.println("sc: " + sc.getClass());
System.out.println("asc: " + asc.getClass());
}
}

class AnotherSampleClass extends SampleClass {
}

When you execute it, what will be printed ?



1. sc: class Object asc: class AnotherSampleClass
2. sc: class SampleClass asc: class AnotherSampleClass
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4. sc: class AnotherSampleClass asc: class AnotherSampleClass