Java Program to Convert long to int

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:
By type-castingUsing toIntExact() methodUsing intValue() method of the Long wrapper class.
By type-casting
Using toIntExact() method
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;
Java
// 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);    }}
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
Java
// 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  }}
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.
Java
// 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);    }}
Converted type: java.lang.Integer
Converted int value: 100
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