gs gs111 Types of Classes (Using Java) - Object Class - Quiz No.1
gs gs111 OOP Object Oriented Programming Java Quiz
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Question 1: What will be the output of the following Java code?
class StudentHashcode { static int num = 60; int temp; Student() { temp = num; } public int hashCode() { return temp; } public static void main(String args[]) { Student s = new Student(); System.out.println(s.hashCode()); System.out.println(s); } } 60 603c Student@3c3c Student@6060 Student@3c
Question 3: What will be the output of the following Java code?
class Clock { public static void main(String[] args) { Clock time = new Clock(); System.out.println("" + time.getClass()); Integer i = new Integer(5); System.out.println("" + i.getClass()); } } class Clock class java.lang.Integerclass Clock class java.lang.Datatypeclass time class java.io.Integerclass Clock class java.io.Integer
Question 4: Which of the following options can be a possible output of the Java code mentioned below?
class FormDetails { int id; String name; String tag; Details(int id, String name, String tag) { this.id=id; this.name=name; this.tag=tag; } public static void main(String args[]) { Details obj1=new Details(1,"Pawan","NoTag"); Details obj2=new Details(2,"Mahesh","NoTag"); System.out.println(obj1); System.out.println(obj2); } } 1 Pawan NoTag 2 Mahesh NoTag1,"Pawan","NoTag" 2,"Mahesh","NoTag"Details@15db9742 Details@6d06d69cobj1@15db9742 obj2@6d06d69c
Question 5: What will be the output of the following Java code?
class PersonalDetails { String name; int age; Person (String name, int age) { this.name = name; this.age = age; } public String toString() { return name + " " + age; } public static void main(String[] args) { Person b = new Person("Gautam Nanda", 21); System.out.println(b.toString()); } }
“Gautam Nanda” 21
Gautam Nanda 21
Compilation Error
“Gautam Nanda 21”
Question 6: What will be the output of the following Java code?
class FinaliseObject { public void finalize() { System.out.println("This is the finalize() method "); } public static void main(String[] args) { String str = new String("Hi, Welcome in Java World"); str = null; System.gc(); System.out.println("This is finalize class"); } }
This is the finalise() method
Hi, Welcome in Java World
This is finalize class
Compilation error
Question 7: What will be the output of the following Java code?
class Cloning implements Cloneable { int id; String name; Cloning(int id, String name) { this.id=id; this.name=name; } public Object clone()throws CloneNotSupportedException { return super.clone(); } public static void main(String args[]) { try { Cloning obj1=new Cloning(1,"dravid"); Cloning obj2=(Cloning)obj1.clone(); System.out.println(obj1.id+" "+obj1.name); System.out.println(obj2.id+" "+obj2.name); } catch(CloneNotSupportedException c){} } } 1 dravid 1 dravid
1 dravid
1 dravid 1 dravid 1 dravid
Compilation error
Question 8: What will be the output of the following Java code?
public class JavaClassExample { public static void main(String[] args) { Object obj1 = new String("Apple"); Class b = obj1.getClass(); System.out.println("Class is:" + b.getName()); } }
Class is Apple
Class is JavaClassExample
Class is java.lang.String
Class is String
Question 10: What will be the output of the following Java code?
class IntegerHashCode { public static void main(String[] args) { int hashValue = Integer.hashCode("155"); System.out.println("Hash code Value for object is: " + hashValue); } }
155
“155”
Compilation error
Hash code Value for object is: 155
