java的初始化规律

源代码

class InitializeBlockClass{
{
field =200;
}
public int field =100;
public InitializeBlockClass(int valve){
this.field=valve;
}
public InitializeBlockClass(){

}
}
public class Test {

public static void main(String[] args) {
InitializeBlockClass obj =new InitializeBlockClass();
System.out.println(obj.field);

obj =new InitializeBlockClass(300);
System.out.println(obj.field);

}

}

java字段的初始化默认为空。