What do you mean by derived data type in java?

Answer 1

A data type of an object describes the kind of information stored in that object. Numbers, strings, images, and all other information in a program is described by some sort of data type.

Answer 2

A category of storing information/data that may or may not be interchangeable. An int is a data type, as is boolean. Each class is also considered its own data type. In real life, "fruit" would be considered a data type, as would "number". Comparing a fruit to a number does not work, since they're not of the same data type. Unless you have a way to convert the fruit into a number, or the number into a fruit, they are incompatible. In java, an "int" would be considered a data type, as would "boolean". Comparing an int to a boolean does not work - is 3 the same as true? The data types aren't compatible. Some common data types available in Java are:

1. int, float, double etc - Used to store numbers 2. String - Used to store alpha numeric values like Names, address etc 3. Boolean - used to store logical values like true/false

Answer 3

data type is the form that the data is in whether it is numeric or character

& its types Boolean,Char
Well, data-type means a set of values, and a set of operations. For example, the data-type 'days of week' consists of seven values (Sunday, ..., Saturday) and a few operations like Previous, Next, IsWeekend, etc.

Answer 4

A language such as Java has some basic data types - and then, by using classes, it is possible to create new data types that contain several basic data types. For example, a String (defined as a class in Java!) is a collection of character (char data type), an array is a collection of just about anything, a Calendar (which really is a date, if I understand correctly) has basic data types to store the day, the month and the year, you can create a Complex data type (for complex numbers) with fields to store the real and the imaginary part of a complex number, or a two- or threedimensional Point data type, with two or three double numbers to store the coordinates, etc.

Answer 5

The Java programming language is strongly-typed, which means that all variables must first be declared before they can be used. This involves stating the variable's type and name: int gear = 1;

Doing so tells your program that a field named "gear" exists, holds numerical data, and has an initial value of "1". A variable's data type determines the values it may contain, plus the operations that may be performed on it. In addition to int, the Java programming language supports seven other primitive data types. A primitive type is predefined by the language and is named by a reserved keyword. Primitive values do not share state with other primitive values. The eight primitive data types supported by the Java programming language are: * byte: The byte data type is an 8-bit signed two's complement integer. It has a minimum value of -128 and a maximum value of 127 (inclusive). The byte data type can be useful for saving memory in large arrays, where the memory savings actually matters. They can also be used in place of int where their limits help to clarify your code; the fact that a variable's range is limited can serve as a form of documentation. * short: The short data type is a 16-bit signed two's complement integer. It has a minimum value of -32,768 and a maximum value of 32,767 (inclusive). As with byte, the same guidelines apply: you can use a short to save memory in large arrays, in situations where the memory savings actually matters. * int: The int data type is a 32-bit signed two's complement integer. It has a minimum value of -2,147,483,648 and a maximum value of 2,147,483,647 (inclusive). For integral values, this data type is generally the default choice unless there is a reason (like the above) to choose something else. This data type will most likely be large enough for the numbers your program will use, but if you need a wider range of values, use long instead. * long: The long data type is a 64-bit signed two's complement integer. It has a minimum value of -9,223,372,036,854,775,808 and a maximum value of 9,223,372,036,854,775,807 (inclusive). Use this data type when you need a range of values wider than those provided by int. * float: The float data type is a single-precision 32-bit IEEE 754 floating point. Its range of values is beyond the scope of this discussion, but is specified in section 4.2.3 of the Java Language Specification. As with the recommendations for byte and short, use a float (instead of double) if you need to save memory in large arrays of floating point numbers. This data type should never be used for precise values, such as currency. For that, you will need to use the java.math.BigDecimal class instead. Numbers and Strings covers BigDecimal and other useful classes provided by the Java platform. * double: The double data type is a double-precision 64-bit IEEE 754 floating point. Its range of values is beyond the scope of this discussion, but is specified in section 4.2.3 of the Java Language Specification. For decimal values, this data type is generally the default choice. As mentioned above, this data type should never be used for precise values, such as currency. * boolean: The boolean data type has only two possible values: true and false. Use this data type for simple flags that track true/false conditions. This data type represents one bit of information, but its "size" isn't something that's precisely defined. * char: The char data type is a single 16-bit Unicode character. It has a minimum value of '\u0000' (or 0) and a maximum value of '\uffff' (or 65,535 inclusive). In addition to the eight primitive data types listed above, the Java programming language also provides special support for character strings via the java.lang.String class. Enclosing your character string within double quotes will automatically create a new String object; for example, String s = "this is a string";. String objects are immutable, which means that once created, their values cannot be changed. The String class is not technically a primitive data type, but considering the special support given to it by the language, you'll probably tend to think of it as such.

Answer 6

A Data type in any programming language refers to the type of Data a variable declared in that language can hold.

Example:

public int i = 100;

public String name = "Rocky";

Above I have created two variables, the first is an int and can contain only integer values. The second is a String and can contain only alphanumeric text values. Similarly there are many such data types.

If you are trying to assign values to a variable that does not match its type, you will get compile time errors.

Ex:

public int i = "Name";

will not compile.

Note: The above examples are in Java but the same applies to all programming languages.

Answer 7

in java basically two types of data

(i) Primitive and

(ii) Non-Primitive

Answer 8

Java has eight primitive data types:

> byte

> short

> int

> long

> float

> double

> boolean

> char