Java初始话很好的一个例子, 摘自Think in Java-优快云博客

本文通过一个详细的Java示例，展示了静态初始化的过程及特点。重点解释了静态成员如何初始化，以及它们与非静态成员之间的初始化顺序差异。

Java初始话很好的一个例子, 摘自Think in Java

package cn.edu.xupt.test;

//: initialization/StaticInitialization.java
//Specifying initial values in a class definition.

//无论创建多少对象, 静态数据都只占用一份存储区域
//初始化的顺序是先静态对象(如果它们尚未因前面的对象创建过程而被初始化), 而后是"非静态"对象
//载入.class文件(这将创建Class对象),有关静态初始化的所有动作执行.
//静态初始化只在Class对象首次加载的时候进行一次
class Bowl {
	Bowl(int marker) {
		System.out.println("Bowl(" + marker + ")");
	}

	void f1(int marker) {
		System.out.println("f1(" + marker + ")");
	}
}

class Table {
	static Bowl bowl1 = new Bowl(1);

	Table() {
		System.out.println("Table()");
		bowl2.f1(1);
	}

	void f2(int marker) {
		System.out.println("f2(" + marker + ")");
	}

	static Bowl bowl2 = new Bowl(2);
}

class Cupboard {
	Bowl bowl3 = new Bowl(3);
	static Bowl bowl4 = new Bowl(4);

	Cupboard() {
		System.out.println("Cupboard()");
		bowl4.f1(2);
	}

	void f3(int marker) {
		System.out.println("f3(" + marker + ")");
	}

	static Bowl bowl5 = new Bowl(5);
}

public class StaticInitialization {
	public static void main(String[] args) {
		System.out.println("Creating new Cupboard() in main");
		new Cupboard();
		System.out.println("Creating new Cupboard() in main");
		new Cupboard();
		table.f2(1);
		cupboard.f3(1);
	}

	static Table table = new Table();
	static Cupboard cupboard = new Cupboard();
} /*
 * Output: 
 * Bowl(1)
Bowl(2)
Table()
f1(1)
Bowl(4)
Bowl(5)
Bowl(3)
Cupboard()
f1(2)
Creating new Cupboard() in main
Bowl(3)
Cupboard()
f1(2)
Creating new Cupboard() in main
Bowl(3)
Cupboard()
f1(2)
f2(1)
f3(1)
 */// :~