1. What is the return type of remove(Object) method of Collection interface? Choose the right option. 1. boolean 2. Object 3. int 4. Integer 2. What is the output of the following snippet of code? Choose the right option. List numbers1 = new ArrayList(); numbers1.add(2); numbers1.add(1); numbers1.set(1, 2); System.out.println(numbers1); 1. [1, 2] 2. [1, 1] …
1. The method that writes a string of DataOutputStream is 1. writeLine(String) 2. write(String) 3. writeString(String) 4. writeBytes(String) 2. What about the following snippet of code? Choose the right one that is true. Hashtable ht = new Hashtable(); ht.put(“marks”, 40); ht.put(“marks”, 50); System.out.println(ht.get(“marks”)); 1. prints 40 2. prints 50 3. Compilation error 4. Throws exception …
1. null key is not accepted by which data structure? 1. HashMap 2. Hashtable 3. List 4. Set 2. What is the output of the following snippet of code? List myList = new ArrayList(); List yourList = new ArrayList(); myList.add(10); myList.add(20); yourList.add(30); yourList.add(40); myList.addAll(yourList); System.out.println(yourList); 1. [10, 20 ] 2. [30, 40 ] 3. [10, …
1. What is the return type of insertElementAt(Object, int) method of Vector? 1. Object 2. boolean 3. void 4. int 2. Observe the following code snippet and choose the right option. List fruits = new ArrayList(); fruits.add(“mango”); ListIterator li1 = fruits.listIterator(); while(li1.hasNext()) { fruits.add(“apple”); System.out.println(li1.next()); } 1. Compiles and at execution throws ConcurrentModificationException 2. prints …
1. What is the default capacity and increment rate of Vector? 1. 10 and 10 2. 10 and 11 3. 11 and 11 4. 10 and 5 2. What is the return type of add(Object) method of interface Collection? 1. void 2. boolean 3. Object 4. int 3. Choose more appropriate option. currentThread() method of …
1. Which method gives the index position of an element in Stack data structure? 1. indexOf() 2. search() 3. elementAt() 4. elementIndexOf() 2. The removeRange(3, 8) removes all the elements in Vector 1. from 3 to 8 2. from 3 to 7 3. from 2 to 8 4. from 2 to 7 3. What is …
1. What is the index position of element 10 in the Stack? Stack st = new Stack(); st.push(10); st.push(20); st.push(30); 1. 0 2. 1 3. 2 4. 3 2. With what you can fill up the blank so that the output is Hyderabad. List cities = new ArrayList(); cities.add(“Hyderabad”); ——- abc = cities.get(0); System.out.println(abc); 1. …
1. Which interface is not in the Collection hierarchy? 1. List 2. Set 3. Map 4. Queue 2. What is the output of the following snippet of code? Hashtable ht = new Hashtable(); StringBuffer sb1 = new StringBuffer(“hello”); ht.put(sb1, “sir”); Enumeration e = ht.keys(); while(e.hasMoreElements()) { Object obj1 = e.nextElement(); Object obj2 = ht.get(obj1); System.out.println(obj1 …
A) Multiple choice Questions Test Your Java 1 Test Your Java 2 Test Your Java 3 Test Your Java 4 Test Your Java 5 Test Your Java 6 Test Your Java 7 Test Your Java 8 Test Your Java – Tricy Questions B) Core Java, Unix & Oracle Set 1 Set 2 Set 3 Set …
What is an exception?The English literature meaning is "something that happens unusually (very rarely)". It is the same meaning with Java also. Exception can be defined as a problem occurring at runtime that prevents the execution of the program. Or to say, an exception is a runtime problem (not compile time as compilation is already …
Note: Explanation is given avoiding more buzz words. Easily understandable manner. Object Casting Polymorphism Interview Questions What is casting? Converting one data type (or object) to the other is known as casting. It is required in a programming language as the user entered data may be in different form than required in coding. How many …
Test Your Java 7 and Test Your Java 8 are advanced questions. Answers are given for each question at the end of each test. Answering these questions increases your knowledge in Java and helps you a lot when you appear for interviews. Solving these basic questions is your first step for Certification Exams preparation. Test …
