Java静态方法 Java拷贝构造函数 Java静态块 Java静态方法 public class InstanceCounter { private static int numInstances = 0; protected static int getCount() { return numInstances; } private static void addInstance() { numInstances++; } InstanceCounter() { InstanceCounter.addInstance(); } public static void main(String[] arguments) { System.out.println("Starting with " + InstanceCounter.getCount() + " instances"); for (int i = 0; i < 500; ++i) { new InstanceCounter(); } System.out.println("Created " + InstanceCounter.getCount() + " instances"); } } Java拷贝构造函数 Java静态块