Jjava Interview Questions
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 …
1. Following snippet of code String citiesArray[] = { “Hyderabad”, “Chennai”, “Vizag”, “Delhi” }; List citiesList = Arrays.asList(citiesArray); for(String temp : citiesList) { System.out.println(temp); } 1. raises compilation error 2. compiles but throws exception 3. compiles, executes and prints all the elements 4. last element is not printed 2. Observe, the following snippet of code. …
1. compareTo(Object) belongs to which class? 1. Collections 2. Comparator 3. Comparable 4. Arrays 2. singletonList(Object) method is defined in? 1. class ArrayList 2. interface List 3. interface Collection 4. class Collections 3. When a thread is started with start() method, in which state it exists? 1. born state 2. runnable state 3. …
Test Your Java Tricky Questions Question 1 on Test Your Java Tricky Questions: What is the output of the following code? class Parent { public Parent() { this.display(); } public void display() { System.out.println(“In parent display method”); } } public class Child extends Parent { public Child() { this.display(); } public void display() { System.out.println(“In …
For every language keyboard input is a must. That is, the user can feed data to a running Java program using keyboard. Java Keyboard Input involves I/O Streams. In Java Keyboard Input can be taken in three ways using three different classes. Let us explore one and then see the other two. Here Scanner class …
What is AWT?AWT stands for Abstract Window Toolkit and infact it is a package – java.awt. The classes of this package give the power of creating a GUI environment to the programmer in Java. What is component?By definition, the subclass of a java.awt.Component class is known as a component. A component can be a Button …
What is Socket? (of Networking Interview Questions) Socket is the end-point of communication for a system. A Socket constructor comes with two parameters of IP address of the other system where the communication should go and the port number on which the service is available on the server required by the client. What is ServerSocket? …
Read all Applets Interview Questions. What is an applet? (of Applets Interview Questions) Applet is a Java program with special syntax to execute in a browser. Applet does not contain main() method. What is the importance of applets in Java coding? (of Applets Interview Questions)Applets can be loaded on client-side so that they can communicate …
What is a IO stream?It is a stream of data that flows from source to destination. Good example is file copying. Two streams are involved – input stream and output stream. An input stream reads from the file and stores the data in the process (generally in a temporary variable). The output stream reads from …
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 …
String StringBuffer Interview Questions Read well String StringBuffer Interview Questions. What is a String in Java?In Java, String does not terminate with \0. String is a class from java.lang package and can be manipulated with String class methods. How strings are immutable? In case of variables, if a variable value is changed, the value in …
What is the advantage of arrays in a programming language? (of Arrays Java Interview Questions) Arrays avoid the declaration of a number of variables. With one array variable, number of values can be stored, using index numbers. What are the features of arrays in Java? (of Arrays Java Interview Questions) Same rules of C/C++ can …
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 …
Note 1: The answers do not use more technical buzz words. It is done to understand the concept very clearly so that a novice can put it in his own words in interviews. OOPS Concepts What are local and global variables? A variable declared inside a method is known as "local variable" and its usage …
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 Exam preparation. The …
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. int …
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. Java's …
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 …
