Integer sum() Method in Java

The Integer.sum() method in Java is a static utility method provided by the java.lang.Integer class. It is used to return the sum of two integer values, behaving exactly like the + operator but offering better readability and usability in functional-style programming.

• This method does not explicitly throw an exception at runtime.
• However, if values exceed the int range (-2³¹ to 2³¹ - 1), integer overflow may occur.
• If a literal value exceeds the int range, a compile-time error is thrown.

Example 1: This program demonstrates how to use the Integer.sum() method to add two integer values in Java.

Explanation:

• Integer.sum(a, b) adds 62 and 18.
• The result 80 is returned and printed.

Syntax

public static int sum(int a, int b)

Parameter:

• a -> the first integer value
• b –> the second integer value 

Return Value: Returns an int value which is the sum of the two arguments.

How It Works

• The method internally performs integer addition similar to: return a + b;
• Being a static method, it can be called directly using the Integer class.

Example 2: Integer Overflow / Invalid Large Value

Output:

error: integer number too large

Explanation:

• The value 92374612162 exceeds the int range.
• Java throws a compile-time error before execution.

Example 3: Finding Sum of Integers Using a Loop

Sum of array elements is: 30

Explanation:

• The Integer.sum() method is used inside a loop.
• It adds each element to the running total.

Related Topics

• Integer Overflow in Java
• Java Wrapper Classes
• Math.addExact() method
• Java Streams reduce() method