Java 的运行顺序

package chow;

/**
 * 这个程序测试java运行顺序
 * 类顺序：父类静态变量-->父类静态方法-->静态变量-->静态方法-->main
 * 构造函数顺序:父类的构造函数-->子类构造函数（构造函数先初始化非静态的变量）
 * @author zhourch
 * 
 */
public class JavaSequence extends Parent{
	private static String str = "init";

	//init,static,static,parent,static,const,const
	static {
		System.out.println("in static:" + str);
		str = "static";
		System.out.println("after static:" + str);
	}
	
	public JavaSequence(){
		System.out.println("in construct:" + str);
		str = "construct";
		System.out.println("after construtct:" + str);
	}
	
	public static void main(String[] args) {
		System.out.println("in main:" + str);
		JavaSequence seq = new JavaSequence();
		System.out.println("after main:" + str);
	}
}

class Parent{
	static{
		System.out.println("parent static");
	}
	public Parent(){
		System.out.println("parent construct");
	}
}

 

输出为：

parent static
in static:init
after static:static
in main:static
parent construct
in construct:static
after construtct:construct
after main:construct

 

结论：

类顺序：父类静态变量-->父类静态方法-->静态变量-->静态方法-->main
构造函数顺序:父类的构造函数-->子类构造函数（构造函数先初始化非静态的变量）