Java Classes and Objects - Unit 2

What are the two essential components required to define a class?

In the declaration of a class, what minimum element must be present?

What two different sections does the body of a class contain?

In the declaration of a member variable, what are the minimum two components that must appear?

What two parts are needed to implement a method, similarly to how a class is implemented?

What is the primary function of constructors in Java classes?

How do constructors typically differentiate from each other when a class has multiple constructors?

What happens if you do not define a constructor in your class?

What is the role of the import statement in Java?

Which keyword is used to define a package in Java?

What is the first statement that should be in a Java source file when defining package?

What access level is the most restrictive?

Which access modifier allows access from any class, regardless of package?

What does 'protected' access allow?

What is the accessibility of a member when no access modifier is specified?

A class is often described as a blueprint for creating what?

What is a primary characteristic of objects created from the same class?

Which of the following best describes a class?

What does 'instantiating' a class mean?

What is the purpose of the this keyword in Java?

In the context of object creation, what are references (punteros)?

What three steps occur when you execute the statement Alumno a1 = new Alumno();?

What is true regarding method overloading in Java?

Which statement accurately describes Java's handling of destructors compared to other programming languages?

What will the following code output? public class Example { public static void main(String[] args) { System.out.println(Math.abs(-5)); } }

What will the following code output? public class Example { public static void main(String[] args) { System.out.println(Math.max(10, 5)); } }

What will the following code output? public class Example { public static void main(String[] args) { String str = "Hello"; System.out.println(str.charAt(1)); } }

What will the following code output? public class Example { public static void main(String[] args) { String str1 = "Hello"; String str2 = " World"; System.out.println(str1.concat(str2)); } }

What will be the result of compiling and executing the following Java code snippet?

public class ClassA {
    public int value = 10;
}

public class ClassB {
    public static void main(String[] args) {
        ClassA obj = new ClassA();
        System.out.println(obj.value);
    }
}

What is the purpose of a 'try' block in exception handling?

What happens when an exception is thrown within a 'try' block?

What is the purpose of the 'catch' block in exception handling?

What will the following code output?

public class Example {
    public static void main(String[] args) {
        try {
            int result = 10 / 0;
            System.out.println("Result: " + result);
        } catch (ArithmeticException e) {
            System.out.println("Cannot divide by zero!");
        }
    }
}

What will the following code output?

public class Example {
    public static void main(String[] args) {
        try {
            int[] arr = new int[5];
            System.out.println(arr[10]);
        } catch (ArrayIndexOutOfBoundsException e) {
            System.out.println("Array index is out of bounds!");
        }
    }
}

How are packages declared in Java?

True or False: A class can only have member variables of a single data type.

True or False: When a method is declared, its return type must always be void.

In the context of object-oriented programming, what is the benefit of using classes and objects?

What is one of the methods defined under JAVA's predefine Math class?