int age;

public Person(String name,int age){ =name; this.age=age; }

public static void main(String[]args){ Person c=new Person("Peter",17); System.out.println(+" is "+c.age+" years old!"); } }

4、写出运行结果：

public class abc{

public static void main(String args[ ]) {

SubSubClass x = new SubSubClass(10 , 20 , 30); x.show(); } }

class SuperClass{

int a,b;

SuperClass(int aa , int bb){

a=aa; b=bb; }

void show( ){

System.out.println("a="+a+" b="+b); } }

class SubClass extends SuperClass{

int c;

SubClass(int aa,int bb,int cc){ super(aa,bb);

c=cc; } }

class SubSubClass extends SubClass{

int a;

SubSubClass(int aa,int bb,int cc){

super(aa,bb,cc); a=aa+bb+cc; }

void show(){

System.out.println("a="+a+" b="+b+" c="+c); } }