No, local variables do not have default values. Once we create a local variable we must initialize it before using it. Since the local variables in Java are stored in stack in JVM there is a chance of getting the previous value as default value. Therefore, In Java default values for local variables are not allowed. Example public class Sample { public static void main(String args[] ){ int data; System.out.println(data); } } Error C:\Sample>javac Sample.java Sample.java:4: error: variable data might not have been initialized System.out.println(data); ^ 1 error

A variable provides us with named storage that our programs can manipulate. Java provides three types of variables. Class variables − Class variables also known as static variables are declared with the static keyword in a class, but outside a method, constructor or a block. There would only be one copy of each class variable per class, regardless of how many objects are created from it. Instance variables − Instance variables are declared in a class, but outside a method. When space is allocated for an object in the heap, a slot for each instance variable value is created. ... Read More

Following are the notable differences between Class (static) and instance variables. Instance variables Static (class) variables Instance variables are declared in a class, but outside a method, constructor or any block. Class variables also known as static variables are declared with the static keyword in a class, but outside a method, constructor or a block. Instance variables are created when an object is created with the use of the keyword 'new' and destroyed when the object is destroyed. Static variables are created when the program starts and destroyed when the program stops. ... Read More

In Java there are various data types present, the String type often leads to confusion regarding whether it is a primitive data type or an object(non-primitive data type ).  Primitive Data Types in Java Primitive data types are the most basic data types the Java language provides. Primitive data types are not objects and do not have methods or properties. Eg: int (32-bit), float(32-bit), double(64-bit ), etc.  What is String in Java? A string is not a primitive data type. Java.lang package provides the String class therefore, it is an object type. The String class provides methods to manipulate and operate ... Read More

Java tokens are smallest elements of a program which are identified by the compiler. Tokens in java include identifiers, keywords, literals, operators and, separators.

Boolean literals represent only two values true or false. And in Java the value of 1 is assumed as true and the value of 0 is assumed as false. Example Live Demo public class Test{ public static void main(String args[]) throws Exception{ boolean bool1 = true; boolean bool2 = false; boolean bool = (25==(100/4)); System.out.println(bool1); System.out.println(bool2); System.out.println(bool); } } Output true false true

Character literals represents alphabets (both cases), numbers (0 to 9), special characters (@, ?, & etc.) and escape sequences like , \b etc. Whereas, the String literal represents objects of String class. Example Live Demo public class LiteralsExample { public static void main(String args[]){ char ch = 'H'; String str = "Hello"; System.out.println("Value of character: "+ch); System.out.println("Value of string: "+str); } } Output Value of character: H Value of string: Hello

Integer literals represent fixed integer values like 900, 12, 400, -222 etc. (with in the integer range). Whereas, floating point literals represents fractional values i.e. numbers with decimal values like 25.53, 45.66, 58.66 etc. while writing these literals we should use the notation f or F as 25.53. Example Live Demo public class StringExample { public static void main(String args[]){ int num1 = 100; float num2 = 30.0f; System.out.println("Value of integer:"+num1); System.out.println("Value of integer:"+num2); } } Output Value of integer:100 Value of integer:30.0

A literal is a source code representation of a fixed value. They are represented directly in the code without any computation. Literals can be assigned to any primitive type variable. Example byte a = 68; char a = 'A' byte, int, long, and short can be expressed in decimal(base 10), hexadecimal(base 16) or octal(base 8) number systems as well. Prefix 0 is used to indicate octal, and prefix 0x indicates hexadecimal when using these number systems for literals. For example − int decimal = 100; int octal = 0144; int hexa = 0x64; String ... Read More

Data types are those which specify the type of data represented by the variable and literal is the that is stored in to the variable. A literal is a source code representation of a fixed value. They are represented directly in the code without any computation. Literals can be assigned to any primitive type variable. Example byte a = 68; char a = 'A'