6、Java 类设计：静态关键字与类特性解析

Java 类设计：静态关键字与类特性解析

1. 静态关键字的使用

在 Java 中，静态关键字（ static ）有着重要的用途。我们先来看一个简单的例子，尝试编写一个类来统计该类创建的对象数量。

// Counter class should count the number of instances created from that class
public class Counter {
    private int count; // variable to store the number of objects created
    // for every Counter object created, the default constructor will be called;
    // so, update the counter value inside the default constructor
    public Counter() {
        count++;
    }
    public void printCount() { // method to print the counter value so far
        System.out.println("Number of instances created so far is: " + count);
    }
    public static void main(String []args) {
        Counter anInstance = new Counter();