Java Tutorial Java Advanced Java References

Java int Keyword



The Java int keyword is a primitive data types. The int data type is a 32-bit signed two's complement integer. Its default value is 0 and default size is 32 bits (4 byte). The range of a int value is -231 to 231-1.

Example: Create a int value

In the example below, variable x and y are created to store int values.

public class MyClass {
  public static void main(String[] args) {   
    //creating int values
    int x = 10;
    int y = 20;

    //printing variables
    System.out.println("x = " + x);
    System.out.println("y = " + y);    
  }
}

The output of the above code will be:

x = 10
y = 20

Example: Widening Casting (smaller to larger type)

An int value can be created by assigning a byte or a short data to an int variable. The compiler implicitly typecast these data types to int as shown in the output.

public class MyClass {
  public static void main(String[] args) {       
    byte num_byte = 10;

    //Widening Casting
    short num_short = num_byte;
    int num_int = num_short;

    //printing variables
    System.out.println("num_byte = " + num_byte); 
    System.out.println("num_short = " + num_short);
    System.out.println("num_int = " + num_int);
  }
}

The output of the above code will be:

num_byte = 10
num_short = 10
num_int = 10

Example: Narrowing Casting (larger to smaller type)

For a larger data types like double, float, and long, narrowing casting is required. The compiler explicitly typecast these data types to int as shown in the output.

public class MyClass {
  public static void main(String[] args) {    
    double num_double = 10.5d;

    //Narrowing Casting
    float num_float = (float) num_double;
    long num_long = (long) num_float;
    int num_int = (int) num_long;

    //printing variables
    System.out.println("num_double = " + num_double);
    System.out.println("num_float = " + num_float); 
    System.out.println("num_long = " + num_long);
    System.out.println("num_int = " + num_int);  
  }
}

The output of the above code will be:

num_double = 10.5
num_float = 10.5
num_long = 10
num_int = 10

❮ Java Keywords




5