long Data Type in Java: Definition and Usage Explained
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long Data Type in Java
When we need big range of numbers then we need this data type.The range of a long is quite large. long is a signed 64-bit type and is useful for those occasions where an int type is not large enough to hold the desired value.
- Long data type is a 64-bit signed two's complement integer
- Minimum value is -9,223,372,036,854,775,808(-2^63)
- Maximum value is 9,223,372,036,854,775,807 (inclusive)(2^63 -1)
- This type is used when a wider range than int is needed
- Default value is 0L
- Example:
long a = 100000L, long b = -200000L
| Data Type | Size(bit) | Range |
|---|---|---|
| short | 64 | –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
long Variable Declaration and Variable Initialization:
Variable Declaration : To declare a variable , you must specify the data type & give the variable a unique name.
long distance;
Variable Initialization : To initialize a variable you must assign it a valid value.
distance= 12121 ;
long Variable Declaration and Variable Initialization in two steps:
long distance; long = 12121;
Example :
Save Source File Name as : LongExample1.javaTo compile : javac LongExample1.java
To Run : java LongExample1
// A Java program to demonstrate long data type
class LongExample1 {
public static void main(String args[])
{
long distance;
distance = 12121;
System.out.println(distance);
}
}
Output
12121 press any key to continue ...
int Variable Declaration and Variable Initialization in one line:
long distance = 12121;
Example :
Save Source File Name as : LongExample2.javaTo compile : javac LongExample2.java
To Run : java LongExample2
// A Java program to demonstrate long data type
class LongExample2 {
public static void main(String args[])
{
long distance = 12121;
System.out.println(distance);
}
}
Output
12121 press any key to continue ...
Example of short
public class LongDataType {
public static void main(String []args) {
// this is declaration and initialization of variable a
// datatype is long
long a = 100000L;
// this is declaration and initialization of variable b
// datatype is long
long b = -200000L;
System.out.println(a); // it will print a variable
System.out.println(b); // it will print b variable
}
}
Output :
100000 -200000 Press any key to continue . . .