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 …
Unassigned Local and Instance Variables Summary: In this "Java unassigned variables" tutorial, you will learn Java nature of unassigned variables which quiet contract to C/C++. One of the features of Java is "Java does not support garbage values". If a variable is used without a value assigned, it is either compilation error or takes a …
All Java programs can be classified as Applications and Applets. The striking differences are that applications contain main() method where as applets do not. One more is, applications can be executed at DOS prompt and applets in a browser. We can say, an applet is an Internet application. Come on, read further Applets Vs Applications. …
Introduction to Suspend Resume Thread When the sleep() method time is over, the thread becomes implicitly active. sleep() method is preferable when the inactive time is known earlier. Sometimes, the inactive time or blocked time may not be known to the programmer earlier; to come to the task here comes suspend() method. The suspended thread …
class Date Methods Summary: By the end of this tutorial "class Date Methods", you will come to know how to use Java Date class methods. Introduction to class Date Methods java.util.Date class constructor is used to print the system date. It comes with many methods to manipulate the date. But these methods are deprecated in …
What is Deprecation Meaning? "Deprecation", warning raised, by the Java compiler, is very common to a Java programmer. It is raised when the programmer uses a method that is found faulty or problematic. A substitute method will be available in the later versions. For example, readLine() method of DataInputStream was deprecated in JDK 1.1 and …
class Random Generate random numbers Summary: By the time you complete this "class Random Generate random numbers", you will understand of how to generate random numbers in Java. Introduction to class Random Generate random numbers Generating different numbers at different times of execution, by the same program, is known as random number generation. Random numbers …
Java String Immutable Comparison Summary: At the end of this tutorial "Java String Immutable Comparison", you will understand the meaning of immutable. Also you will come to know the styles of comparing Java strings. String handling and string manipulation play a vital role in programming. The simplicity in handling makes a language more programmer-friendly. Java …
Here, we use the overloaded methods of substring() to extract the whole or a part of a string. Following is the signature of overloaded substring() method as defined in String class. String substring(int indexNum): Returns a string containing all the characters existing from indexNum to the end in the given string. String substring(int indexNum1, int …
Convert Data type Java String Summary: Many a times, it is required in Java coding to convert string to data types or data types to string. This tutorial "Convert Data type Java String" does this job. In parsing operations, we convert strings into data types. Sometimes, code demands to convert data types and objects into …
The String class is rich with abundant methods used in coding. One of the methods is overloaded regionMatches() used to find the existence of a few characters of one string in another. Supported methods from String class. boolean regionMatches(int positionFirstString, String secondString, int positionSecondString, int num): Returns a boolean value of true if the region …
Arrays Introduction Tutorial Properties Summary: This tutorial "Arrays Introduction Tutorial Properties", discusses arrays properties in simple terms, example code and screenshots. Start reading. Array is a data structure capable to hold data of similar data types. Every language comes with its own rules for arrays. For example, JavaScript and VBScript comes its own set of …
Reference Variables Anonymous objects Summary: By the end of this tutorial "Reference Variables Anonymous objects", you will be comfortable in creation of Java objects, reference variables and anonymous objects. Java includes two types of variables – primitive variables and reference variables. A primitive type refers a primitive data type and reference type refers a class. …
Java Naming Conventions Readability Summary: Unlike C/C++, Java comes with naming conventions to increase the readability of code. This "Java Naming Conventions Readability" explains how to do it. After knowing the rules of identifiers, it is the time to know the another grammar of Java known as "conventions". Conventions increase the readability of the program. …
Java static Variable Method Summary: By the end of this tutorial "Java static Variable Method", you will comfortable to write programs with static variables and methods. After discussing the usage of "this" keyword, let us move to another keyword "static". The "static" keyword is used as an access modifier. Java has access specifiers and access …
Data Binding Data Hiding Encapsulation Summary: This tutorial "Data Binding Data Hiding Encapsulation "is targeted as a good starting point for those who are new to OOPS concepts. Even if you are familiar with, start reading and you may find something useful that you have not known earlier. Or you can enjoy the approach I …
Composition vs Inheritance After Encapsulation, the second OOPS feature is "Inheritance". In the previous Parrot program, the Parrot created an object of Bird and used Bird's method eat(). Now in inheritance, we call the eat() method with Parrot object itself (and not with Bird object). This is the difference between composition and inheritance. In composition, …