问题描述
我需要创建一个 Java 方法来随机返回 true 或 false.我该怎么做?
I need to create a Java method to return true or false randomly. How can I do this?
推荐答案
类java.util.Random已经有这个功能了:
public boolean getRandomBoolean() { Random random = new Random(); return random.nextBoolean(); }
但是,每次需要随机布尔值时总是创建一个新的 Random 实例效率不高.相反,在您的类中创建一个需要随机布尔值的 Random 类型的属性,然后为每个新的随机布尔值使用该实例:
However, it's not efficient to always create a new Random instance each time you need a random boolean. Instead, create a attribute of type Random in your class that needs the random boolean, then use that instance for each new random booleans:
public class YourClass { /* Oher stuff here */ private Random random; public YourClass() { // ... random = new Random(); } public boolean getRandomBoolean() { return random.nextBoolean(); } /* More stuff here */ }