how to addin java

To add two numbers in Java, you can use the + operator. Here's an example of how to do this:

int x = 5;
int y = 7;
int sum = x + y;

This will add the two numbers x and y and store the result in the sum variable.

You can also use the + operator to concatenate strings. For example:

String s1 = "Hello";
String s2 = "World";
String s3 = s1 + s2;

This will concatenate the two strings and store the result in the s3 variable.