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class SuperClass {
private int n;

SuperClass() {
System.out.println("SuperClass()");
}

SuperClass(int n) {
System.out.println("SuperClass(" + n + ")");
this.n = n;
}
}
class SubClass extends SuperClass {
private int n;

SubClass() {
//super();//¸¸À๹Ôì·½·¨±ØÐë·ÅÔÚ×ÓÀ๹Ôì·½·¨µÚÒ»ÐÐ
System.out.println("SubClass()");
}

SubClass(int n) {
//super(n);//ÇÒÈç¹û×ÓÀ๹Ôì·½·¨ÖÐûÓÐÏÔʾµ÷Óø¸À๹Ôì·½·¨,Õß×Ô¶¯µ÷Óø¸ÀàµÄÎ޲ι¹Ôì·½·¨.Èô¸¸ÀàÎÞÎ޲ι¹Ôì·½·¨,Ôò±àÒë³ö´í.
System.out.println("SubClass(" + n + ")");
this.n = n;
}
}
public class TestSuperSub {
public static void main(String arg[]) {
SubClass sc1 = new SubClass();
SubClass sc2 = new SubClass(400);
}
}