class con1{
public con1(){
System.out.println("1");
}
}
class con2 extends con1{
public con2(){
String t="hello";
System.out.println("2");
System.out.println(t);
aa();
public void aa(){
System.out.println("this not");
System.out.println(t);
}
}
}
class con3 extends con2{
int s=23232;
public con3(){
System.out.println("12");
System.out.println("last "+s);
public void aa(){
System.out.println("hi "+s);
}
pubic static void main(String[] as){
con3 m=new con3();
m.con3();
m.aa();
}
}
}
大哥上面这个程序有四处错误请帮帮我

class con1{
public con1(){
System.out.println("1");
}
}
class con2 extends con1{
String t;
public con2(){
t="hello";
System.out.println("2");
System.out.println(t);
aa();

}
public void aa(){ //方法是不能写在方法里面的...
System.out.println("this not");
System.out.println(t);
}
}
class con3 extends con2{
int s=23232;
public con3(){
System.out.println("12");
System.out.println("last "+s);

}
public void aa(){
System.out.println("hi "+s);
}
public static void main(String[] as){
con3 m=new con3();
// m.con3(); //没有这个方法，只有con3类的构造函数
m.aa();
}
}