Java Program to Convert int to long
Last Updated :
10 Jan, 2023
Given a number of int datatype in Java, your task is to write a Java program to convert this given int datatype into a long datatype.
Example:
Input: intnum = 5
Output: longnum = 5
Input: intnum = 56
Output: longnum = 56
Int is a smaller data type than long. Int is a 32-bit integer while long is a 64-bit integer. They both are primitive data types and the usage depends on how large the number is.
Java int can be converted to long in two simple ways:
- Using a simple assignment. This is known as implicit type casting or type promotion, the compiler automatically converts smaller data types to larger data types.
- Using valueOf() method of the Long wrapper class in java which converts int to long.
1. Implicit type casting:
- In this, we are simply assigning an integer data type to a long data type.
- Since integer is a smaller data type compared to long, the compiler automatically converts int to long, this is known as Implicit type casting or type promotion.
Java
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
int intnum = 5 ;
long longnum = intnum;
System.out.println(
"Converted type : "
+ ((Object)longnum).getClass().getName());
System.out.println( "After converting into long:" );
System.out.println(longnum);
}
}
|
Output
Converted type : java.lang.Long
After converting into long:
5
2. Long.valueOf() method:
- In this, we are converting int to long using the valueOf() method of the Long Wrapper class.
- The valueOf() method accepts an integer as an argument and returns a long value after the conversion.
Java
import java.io.*;
class GFG {
public static void main(String[] args)
{
int intnum = 56 ;
Long longnum = Long.valueOf(intnum);
System.out.println(
"Converted type : "
+ ((Object)longnum).getClass().getName());
System.out.println( "After converting into long:"
+ "\n" + longnum);
}
}
|
Output
Converted type : java.lang.Long
After converting into long:
56
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