17 Aug When Overflow of DataTypes occur in Java

When a value more than the Maximum value of a datatype is assigned, it leads to Overflow. Java handles overflow of  datatypes on its own, for example, if we will increment 1 to Integer.MAX_VALUE, an error won’t be visible. However, the output will be Integer.MIN_VALUE.

Let us now see some examples displaying how Java handles overflow of datatypes:

Example 1

The code shows how Java handles overflow of int datatype:

public class Example {

  public static void main(String[] args) {
    
    System.out.println("int type MAXIMUM Value = " + Integer.MAX_VALUE);
    System.out.println("int type MINIMUM Value = " + Integer.MIN_VALUE);
    
    System.out.println("\nOn incrementing, the result is equivalent to integer's minimum value...");

    System.out.println("\nIncrementing Integer Maximum Value = " + (Integer.MAX_VALUE+1));
  }
}

Output

int type MAXIMUM Value = 2147483647
int type MINIMUM Value = -2147483648

On incrementing, the result is equivalent to integer's minimum value...

Incrementing Integer Maximum Value = -2147483648

Example 2

The code shows how Java handles overflow of long datatype:

public class Example {

  public static void main(String[] args) {
    
    System.out.println("long type MAXIMUM Value = " + Long.MAX_VALUE);
    System.out.println("long type MINIMUM Value = " + Long.MIN_VALUE);
    
    System.out.println("\nOn incrementing, the result is equivalent to long's minimum value...");

    System.out.println("\nIncrementing long Maximum Value = " + (Long.MAX_VALUE+1));
  }
}

Output

long type MAXIMUM Value = 9223372036854775807
long type MINIMUM Value = -9223372036854775808

On incrementing, the result is equivalent to long's minimum value...

Incrementing long Maximum Value = -9223372036854775808

However, this is not the case with any other datatype. Let’s see another example wherein we are multiplying the Maximum value of Float type:

Example 3

public class Example {

  public static void main(String[] args) {
    
    System.out.println("float type MAXIMUM Value = " + Float.MAX_VALUE);
    System.out.println("float type MINIMUM Value = " + Float.MIN_VALUE);

    System.out.println("\nUpdating Float Maximum Value = " + (Float.MAX_VALUE*5));
  }
}

Output

float type MAXIMUM Value = 3.4028235E38
float type MINIMUM Value = 1.4E-45

Updating Float Maximum Value = Infinity

In the above output, we are getting Infinity i.e. Overflow since we exceeded the maximum value of Float Datatype in Java.