Please help me , what is the wrong in this code ??

Question

https://code.sololearn.com/crHw90zeLcS1/?ref=app

Answer 1

So, lines 4, 28 and 38
Line 4: The method is setNum(sn) not setnum(sn) so you need to fix that
Line 28: You wrote the string is a without quotes so change that line to this: "type is a " + super.toString();
Line 38: If you do not do System.out.println(m.toString()) nothing will actually be printed so add the System.out.println()

Answer 2

Nvm cyk , I removed the dups.
Happens sometimes due to connectivity issues, maybe that was the case here.

Answer 3

This question shows up 3 times in the Discussion board. Could you please delete the other 2? And I will be taking a look at the code in the meantime ☺

Answer 4

You call the method like this setnum(sn);
but declared it like that:

public void setNum(int sn){
num=sn;
}

Java is case sensitive change the method call to setNum(sn);

Also on the lines where you override the to string method you have too many " " around the return statement.

And you should annotate the toString method with @Override. This is not a must, but encouraged.

Answer 5

Suha To remove your question:
Tap on the three dots next to the title > remove.
But it's done for now.

Answer 6

class Machine{
private int num ;
public Machine (int sn){
this.setNum(sn);
}
public void setNum(int sn){
num=sn;
}
public int getNum(){
return num;
}
public String toString(){
return "Machine";
}
}
class Mobile extends Machine{
private String type;

public Mobile (int sn , String type) {
super(sn);
setType(type);
}

public void setType(String type){
this.type=type;
}
public String getType(){
return type ;
}
public String toString(){
return ( "This is a" + this.getType());
}
}

public class Program{

public static void main(String[] args) {

Mobile m = new Mobile (2 , "Apple");
System.out.println(m.toString());
}
}

Answer 7

Sorry , I don’t know how to deal with application