What does i-- mean in java?

i-- in Java is the post-decrement operator. First, the value of i is used as the operand, and then the value of i is decremented by 1. It is different from the pre-decrement operator (--i). It decrements the value of i before using it. Usually i-- is used when you need to decrement a variable before or after using it.

The meaning of i-- in Java

The meaning of i-- in Java Post-decrement operator, which first uses the value of variable i as an operand, and then decrements the value of i by 1.

How it works

The following code demonstrates how the i-- operator works:

<code class="java">int i = 10;
int j = i--; // j 等于 10，因为 i-- 先将 10 赋值给 j，然后再将 i 递减为 9</code>

Difference Prefix decrement (--i)

Prefix decrement operator (--i) and post-decrement operator (i-- ) is the order of operations:

• --i decrements the value of i before using it as the operand, and then decrements the The value is assigned to i.
• i-- First takes the value of i as the operand and then decrements it.

So, in the example above, --i would make i have the value 9, while The value of j is 8:

<code class="java">int i = 10;
int j = --i; // i 等于 9，因为 --i 先递减 i 为 9，然后再赋值给 j，导致 j 也等于 9</code>

When to use

Typically, when you need to decrement a variable before or after using it , i-- will be used.

For example:

• Decreasing a loop variable in a traversal loop
• When updating a counter
• When deleting an element from a list or array

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