Java变量的初始化及静态方法的实现

package treat;
class InitializeBlockClass
{
  public int field=100;
  {
    field=200;
  }
  public InitializeBlockClass(int value)
  {
    this.field=value;
  }
  public InitializeBlockClass()
  {
    
  }
}

public class treat {
  public static void main(String args[])
  {
    InitializeBlockClass obj=new InitializeBlockClass();
    System.out.println(obj.field);
    obj=new InitializeBlockClass(300);
    System.out.println(obj.field);
  }
}

package treat;

public class treat {
  
  public int dg=0;
  void fun()
  {
    System.out.println("hello world!!");
  }
  static void play(treat a)//通过形参传递对象实现非静态方法的调用
  {
    a.fun();
    a.dg=8;//调用对象改变非静态字段的值
    System.out.println(a.dg);
  }
  public static void main(String args[])
  {
    treat a=new treat();
    treat.play(a);
  }
}