动手动脑（10.14）

public class Test{

  public static void main(String[] args) {
   Fool obj1=new Foo();
}
}
class Foo{
   int value;
   public Foo(int initValue){
    value=initValue;
}
}

public class InitializeBlockClass {
    {
        field=200;
    }
    public int field=100;
    public InitializeBlockClass(int value){
        this.field=value;
    }
    public InitializeBlockClass() {
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        InitializeBlockClass obj=new InitializeBlockClass();
        System.out.println(obj.field);
        obj=new InitializeBlockClass(300);
        System.out.println(obj.field);
        }
}