Java实现0至3的随机数生成器：现有代码咨询

Hey there! Let's break down your code and whether it meets your requirement for a random number between 0 and 3.

First, let's clarify how Java's Random.nextInt(int bound) works: this method generates a random integer in the range 0 (inclusive) to the bound value (exclusive).

Your current code:

Random dealerNum = new Random(); 
int dealer = dealerNum.nextInt(3);

This will only produce the values 0, 1, 2 — it will never generate 3, so it doesn't fully meet your need if you want 3 to be included in the range.

How to fix it: #

To get a random integer that includes 3 (covering the full range 0,1,2,3), you just need to set the bound parameter to 4 (since the upper limit is exclusive). Here's the adjusted code:

Random dealerNum = new Random(); 
int dealer = dealerNum.nextInt(4);

A quick best practice tip: #

Try to reuse a single Random instance instead of creating a new one every time you need a random number. Creating multiple instances in quick succession can lead to less random results, as they might seed from the same system clock value. For example:

// Declare this once, maybe as a class-level variable
private static final Random RANDOM = new Random();

// Then use it whenever you need a number
int dealer = RANDOM.nextInt(4);

内容的提问来源于stack exchange，提问作者Sonia