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Java Program to Convert long to int
  • Last Updated : 27 Nov, 2020

Long is a larger data type than int, we need to explicitly perform typecasting for the conversion. Typecasting is performed through the typecast operator. There are basically three methods to convert long to int:

  1. By type-casting
  2. Using toIntExact() method
  3. Using intValue() method of the Long wrapper class.

1. Using Explicit Type Casting

In typing casting, a data type is converted into another data type by the programmer using the casting operator during the program design. In typing casting, the destination data type may be smaller than the source data type when converting the data type to another data type, that’s why it is also called narrowing conversion.

Syntax/Declaration:

destination_datatype = (target_datatype)variable;

() is a casting operator.

target_datatype: is a data type in which we want to convert the source data type.



Type Casting Example:

float x;
byte y;
...
...
y=(byte)x;

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// Java Program to convert long to int
  
import java.util.*;
class GFG {
    public static void main(String[] args)
    {
       
        // long value
        long longnum = 10000;
  
        // explicit type casting from long to int
        int intnum = (int)longnum;
        
        System.out.println("Converted type: "+ ((Object)intnum).getClass().getName());
        System.out.println("Converted int value is: "
                           + intnum);
    }
}

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Output

Converted type: java.lang.Integer
Converted int value is: 10000

2. Using  toIntExact() method

Syntax :

public static int toIntExact(long value)

Parameter:

  • value : the long value

Return:
This method returns the input argument as an int(integer).

Exception:
It throws ArithmeticException – if the result overflows an int

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// Java Program to convert long to int
  
class Main {
  public static void main(String[] args) {
  
    // create long variable
    long value1 = 523386L;
    long value2 = -4456368L;
  
    // change long to int
    int num1 = Math.toIntExact(value1);
    int num2 = Math.toIntExact(value2);
      
    // print the type
    System.out.println("Converted type: "+ ((Object)num1).getClass().getName());
    System.out.println("Converted type: "+ ((Object)num2).getClass().getName());
  
    // print the int value
    System.out.println(num1);  // 52336
    System.out.println(num2);  // -445636
  }
}

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Output

Converted type: java.lang.Integer
Converted type: java.lang.Integer
523386
-4456368

3. Using intValue() method of Long wrapper class

Syntax:

public int intValue()

Parameters: The method does not accept any parameters.

Return Value: The method returns the numeric value which is represented by the object after conversion to the integer type.

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// Java Program to convert long to int using intValue()
// method
  
class GFG {
    public static void main(String[] args)
    {
        // Long object
        Long longnum = 100L;
  
        // Converting Long object to int primitive type
        int intnum = longnum.intValue();
  
        // printing the type
        System.out.println("Converted type: "
            + ((Object)intnum).getClass().getName());
  
        // printing the int value
        System.out.println("Converted int value: "
                           + intnum);
    }
}

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Output

Converted type: java.lang.Integer
Converted int value: 100

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