初始化的实例

说明：包含main()方法的类中包含有static类，static类先初始化


class Bowl1 {
	Bowl1(int marker) {
		System.out.println("Bowl(" + marker + ")");
	}
	void f1(int marker) {
		System.out.println("f1(" +marker + ")");
	}
}

class Table1 {
	static Bowl1 bow1 = new Bowl1(1);
	Table1() {
		System.out.println("Table1()");
		bowl2.f1(1);
	}
	void f2(int marker) {
		System.out.println("f2(" + marker + ")");
	}
	static Bowl1 bowl2 = new Bowl1(2);
}

class Cupboard1 {
	Bowl1 bowl3 = new Bowl1(3);
	static Bowl1 bowl4=new Bowl1(4);
	Cupboard1() {
		System.out.println("Cupboard1()");
		bowl4.f1(2);
	}
	void f3(int marker) {
		System.out.println("f3(" + marker + ")");
	}
	static Bowl1 bowl5 = new Bowl1(5);
}
public class StaticInitialzation {
	public static void main(String[] args){
		System.out.println("Creating new CupBoard1() in main");
		new Cupboard1();
		System.out.println("Creating new CupBoard1() in main");
		new Cupboard1();
		table.f2(1);
		Cupboard.f3(1);
	}
	static Table1 table = new Table1();
	static Cupboard1 Cupboard = new Cupboard1();
}

结果：
Bowl(1)
Bowl(2)
Table1()
f1(1)
Bowl(4)
Bowl(5)
Bowl(3)
Cupboard1()
f1(2)
Creating new CupBoard1() in main
Bowl(3)
Cupboard1()
f1(2)
Creating new CupBoard1() in main
Bowl(3)
Cupboard1()
f1(2)
f2(1)
f3(1)

class B1 {

	void f(){
		System.out.println(1);
	}
}

class A1 {
	static B1 b;
	static {
		 b=new B1();
	}
	
	A1(){
		System.out.print("a");
	}
}
public class StaticInitialzation {
	public static void main(String args[]) {
	A1.b.f();
		
	}
}

静态初始化只有在必要时刻才会进行(不是说会自动初始化所有类中的静态变量或者静态块)：
1.当第一引用类中的static变量时，所有的static变量和static块都会被初始化，类本身不会初始化(A1没有初始化)
2.创建类(B1)