Java子类实例化总是默认调用父类的无参构造操作

package classTest;
class Father {
 public Father(){
 System.out.println("父类的无参构造方法");

 }
 public Father(int a ) {
 System.err.println("父类的有参构造方法"+a);
 } 
}
class Son extends Father{
 public Son() {
 System.out.println("子类中的无参构造方法");
 }
 public Son(int a ) {
  System.out.println("子类中的有参构造方法"+a);
 } 
}

public class TestExecute {
 public static void main(String[] args) {
 Son s = new Son();
 System.out.println("---------------");
 Son a = new Son(5); 
 }
}

class SuperClass {
 private int n;
 SuperClass(){ //父类的无参构造器
  System.out.println("SuperClass()");
 }
 SuperClass(int n) { //父类的带参构造器
  System.out.println("SuperClass(int n)");
  this.n = n;
 }
}
class SubClass extends SuperClass{ 
 private int n;
 
 SubClass(){ //子类的无参构造器
  super(300);//调用父类的带参构造器，super(300)相当于SuperClass(300)
  System.out.println("SubClass");
 } 
 
 public SubClass(int n){ //子类的带参构造器
  System.out.println("SubClass(int n):"+n);
  this.n = n;
 }
}
public class TestSuperSub{
 public static void main (String args[]){
  SubClass sc = new SubClass();
  SubClass sc2 = new SubClass(200); 
 }
}

SuperClass(int n)
SubClass
SuperClass()
SubClass(int n):200