Can anybody tell me what is the problem in the code below?

Question

package first;
class A {
A a;
A(){}
A(A aa){
this.a=aa;
String name;
void setname(String a){
this.name=a;
void bar(){
dostuff(a);
void dostuff(A a1){
a.setname("vahvah");
//a1=new A();
public static void main(String args[]){
A a2=new A();
A a1=new A(a2);
a2.bar();
System.out.println("name= "+a2.name);
}

Answer 1

class A {
A a;
String name;
A(){}
A(A a){
    this.a=a;
void setname(String a){
    this.name=a;
static void dostuff(A a1){
    a1.setname("vahvah");
//a1=new A();
String getName()
    return name;
public static void main(String args[]){
    A a2=new A();
    A a1=new A(a2);
    dostuff(a1);
    System.out.println("name= " + a1.getName());
    System.out.println("name= " + a2.getName());
    dostuff(a2);
    System.out.println("name= " + a1.getName());
    System.out.println("name= " + a2.getName());
}