Java Essay: Mixed-type expression type conversion issues

Mixed expressions handle a lot of "pits" and look at the following code:

Short x = 0;int y = 123456;x + = y; SYSTEM.OUT.PRINTLN (x);

According to the normal understanding x+=y is equivalent to x = X+y

This converts the Y-strong of int to short x, which reports an error:

Error: Incompatible type: conversion from int to short may be a loss

However, the above code actually did not error.

This is where the mixed-type expression is converted by default , converting the result to the type of the left variable, which is the X-type short.

Since 123456 crosses the border, the result is-7616.

Summarize

Hidden type conversions are likely to compile without an error, but the actual result is truncated.

When the right and left side types are not equal, be sure to pay attention.

Java Essay: Mixed-type expression type conversion issues