Write Java program to Convert String to Long

The code prompts the user to enter a string representing a number, then converts the string to a long data type using two different methods and prints out the results.

The Long.valueOf(str).longValue() method first converts the string str to a Long object using the valueOf() method and then retrieves the long value of the object using the longValue() method. This method can throw a NumberFormatException if the string cannot be parsed as a long.

The Long.parseLong(str) method directly converts the string str to a long primitive data type. This method can also throw a NumberFormatException if the string cannot be parsed as a long.

Note that if the input string represents a number that is outside the range of the long data type, an error may occur or the output may not be accurate.

Source Code

import java.util.Scanner;
public class StringToLong
{
	public static void main(String args[])
	{
		Scanner input = new Scanner(System.in);
		String str;
		System.out.print("Enter the Number : ");
		str = input.next();
		System.out.println("String Value : " + str);
 
		long long_val = 0;
 
		//longValue() Method 1
		long_val = Long.valueOf(str).longValue();
		System.out.println("Long Value Using longValue() Method : " + long_val);
 
		//parseLong() Method 2
		long_val = Long.parseLong(str);
		System.out.println("Long Value Using parseLong() Method : " + long_val);
	}
}

Output

Enter the Number : 123456
String Value : 123456
Long Value Using longValue() Method : 123456
Long Value Using parseLong() Method : 123456