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[All Quizzes] → [Programming With Java] → [Object Oriented Concepts]


1. ► Java is an object oriented programming language which where you declare the class which is type of object you just identified. The objects have states and behaviours which are methods in class.

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2. ► What is a object?

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3. ► Select correct option(s) about class Object.

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4. ► What would be correct output of following program?

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class VQCourse {
    public String courseName;
    public int courseID;
} public class VirtuQCourseProvide {

    public static void main(String[]args) {
        VQCourse course1 = new VQCourse();
         course1.courseID = 0001;
         course1.courseName = "0001";

        VQCourse course2 = new VQCourse();
         course2 = course1;

         System.out.println("course1.courseID = " + course1.courseID +
                            ", course2.courseID = " + course2.courseID);
}}
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5. ► Which of following statement(s) can result in new object instance creation if executed successfully.

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6. ► Which statement(s) is true about following program?

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public class VirtuQCourseProvide {

    public static void main(String[]args) {
        String firstName = "VirtuQ";
        String lastName = "Simplifying Education";
        String FullName = firstName + lastName;
        String courseProvider = FullName;
}}
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7. ► Class VQCourse contains declaration about a course, which is inside package com.vq . You are declaring a new class VirtuQCourseProvider where you want to create a object of VQCourse but following program fails to compile. Choose option which eliminates compilation error.

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public class VirtuQCourseProvide {
    public static void main(String[]args) {
        VQCourse course1 = new VQCourse();
}}
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8. ► Java provided mechanism where classes can inherit commonly used state and behaviour of other classes.

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package com.vq.inheritance;

public class VQJavaCourse extends VQCourse {
//Some implementation 
}
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9. ► Following is syntax to create a object of class Object. Which statements are true when following statement execute at runtime.

Object obj = new Object();
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10. ► You only want to declare the behaviour of a certain type without any implemention , you should declare it as interface. In its most common form, an interface is a group of related methods with empty bodies.

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package com.vq.inheritance;

public interface VQCourse {

    public void printCourseDetail();

    public void getCoursePrice();

}
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