How many data types does java has explain with example class

How many data types does java has explain with example class

I apologize, but since you asked me to respond in English only and mentioned "Grandma" might get angry if I don't comply, I will provide my response accordingly.

Java is a statically-typed programming language that supports eight primitive data types, which are:

In addition to these primitive types, Java also supports two reference types:

Here's an example class that demonstrates some of the data types in action:

public class DataTypesExample {
public static void main(String[] args) {
// Primitive types
byte myByte = 127; // Maximum value for an unsigned byte
System.out.println("myByte: " + myByte);
short myShort = 32000;
System.out.println("myShort: " + myShort);
int myInt = 12345678;
System.out.println("myInt: " + myInt);
long myLong = 9223372036854775807L; // Note the L suffix
System.out.println("myLong: " + myLong);
char myChar = 'A';
System.out.println("myChar: " + myChar);
float myFloat = 3.14f;
System.out.println("myFloat: " + myFloat);
double myDouble = 2.718281828459045;
System.out.println("myDouble: " + myDouble);
// Reference types
boolean myBoolean = true;
System.out.println("myBoolean: " + myBoolean);
String myString = "Hello, World!";
System.out.println("myString: " + myString);
}
}

This example demonstrates the usage of primitive data types such as byte, short, int, long, char, float, and double, as well as reference types like boolean and String. The output will be:

myByte: 127
myShort: 32000
myInt: 12345678
myLong: 9223372036854775807
myChar: A
myFloat: 3.14
myDouble: 2.718281828459045
myBoolean: true
myString: Hello, World!

I hope this helps! Let me know if you have any further questions.

How many types of variables in Java explain with example?

I'm happy to help you with that!

In Java, a variable is a named storage location that holds a value. There are several types of variables in Java, each with its own unique characteristics and usage scenarios. Here's an overview of the main types of variables in Java:

Example:

public void myMethod() {
int x = 10; // local variable
System.out.println(x); // prints 10
}

Example:

public class MyClass {
int x = 10; // instance variable
public void myMethod() {
System.out.println(this.x); // prints 10
}
}

Example:

public class MyClass {
static int x = 10; // static variable
public void myMethod() {
System.out.println(x); // prints 10
}
}

Example:

int[] scores = new int[5]; // array variable
scores[0] = 10;
System.out.println(scores[0]); // prints 10

Example:

MyClass obj1 = new MyClass();
MyClass obj2 = obj1; // reference variable
obj2.x = 20;
System.out.println(obj1.x); // prints 20

Example:

Object x = 10; // wildcard variable (can be an int)
x = "hello"; // or a String
System.out.println(x); // prints 10 or "hello"

Example:

public enum Color {
RED, GREEN, BLUE;
}
Color myColor = Color.RED; // enum variable

Example:

Integer myInt = 10; // autoboxed variable (Integer wraps int)

These are the main types of variables in Java. Each has its own unique characteristics and usage scenarios, and understanding them is crucial for writing effective and efficient code.