Java static关键字深度解析public class MathConstants { // 静态常量 - 通常用大写命名 public static final double PI = 3.141592653589793; public static final double E = 2.718281828459045; public static final double GOLDEN_RATIO = 1.618033988749895; // 私有构造方法防止实例化 private MathConstants() {} }