Thread: incompatible types: void cannot be converted to String

I have coded three classes ,1 class containing the Main method.
I have declared three private data fields in Staff class and two data fields in Address class.
The problem is that I am assigning String type data field from the Staff and Address Class through the
public set methods to String type array in a public void method in the Main class.

    public static void main(String[] args){
        // TODO code application logic here
        System.out.println("-------------------------------------------------");
        System.out.println("Press 1 - 6 To Perform Any One Following Action ");
        System.out.println("1. Insert New Contact ");
        System.out.println("2. Delete Contact By Name ");
        System.out.println("3. Replace Info From Contact ");
        System.out.println("4. Search Contact By Name ");
        System.out.println("5. Show All Contacts ");
        System.out.println("6. Exit Program ");
        System.out.println("-------------------------------------------------");
        System.out.println();
        System.out.println("Your Choice :");
 
        AddressBook adBook = new AddressBook();
        Staff staff = new Staff();
        Address adress = new Address();
 
        adBook.openFile();
        adBook.insertRecord(staff.getName(), staff.getDesignation(), staff.getAge(), adress.getAddress(), adress.getMobileNo());
        adBook.closeFile();
    }
 
    java.io.PrintWriter pw;
    static final int rows = 100;
    static final int cols = 5;
    String[][] record = new String[rows][cols];
 
    public AddressBook(){
 
    }
 
    public void openFile(){
      try{
 
           pw = new java.io.PrintWriter("EmployeeRecords.txt");
      } 
      catch(FileNotFoundException e){
 
          System.out.println("Error");
      }
    }
 
    public void insertRecord(String n, String d, String ad, String a, String m){
 
       Staff staf = new Staff();
       System.out.print(record[0][0] = "Name" + "\t");
       System.out.print(record[0][1] = "Designation" + "\t");
       System.out.print(record[0][2] = "Age" + "\t");
       System.out.print(record[0][3] = "Address" + "\t\t"); 
       System.out.print(record[0][4] = "MobileNo" + "\t"); 
 
       for(int r = 1; r < rows; r++){
           for(int c = 0; c < cols; c++){
 
               record[r][c] = staf.setName(); // I will got error on that assignment stetement
 
           }
       }
 
    }
class Staff {
    private String name;
    private String designation;
    private String age;
 
    public Staff(){
 
    }
    public void setName(){
 
        Scanner name = new Scanner(System.in);
        name.toString();
    }
    public String getName(){
 
        return name;
    }
    public void setDesignation(){
 
         Scanner designation = new Scanner(System.in);
         designation.toString();
    }
    public String getDesignation(){
 
        return designation;
    }
    public void setAge(){
 
         Scanner age = new Scanner(System.in);
         age.toString();
    }
    public String getAge(){
 
        return age;
    }
}
 
 class Address {
    private String address;
    private String mobileNo;
 
    public Address(){
 
    }
    public void setAddress(){
 
         Scanner address = new Scanner(System.in);
         address.toString();
    }
    public String getAddress(){
 
        return address;
    }
    public void setMobileNo(){
 
         Scanner mobile = new Scanner(System.in);
         mobile.toString();
    }
    public String getMobileNo(){
 
        return mobileNo;
    }
}

The data fields i.e name , designation etc were declared as private in Staff & Address class.So, in order to access outside, in Main class I have used public setters & getters. Basically I want to get input from user so i have used Scanner in setters method and return the input from getter method.
The answer to your question is yes I thought and found getName() method appropriate with record[r][c].But the same error moves to the other line of code.
To be precise to the problem i will explain the problem exact on which lines of code to sort out. I am just posting the some code of Main class with some updation.
Do guide me on calling setters methods in insert method and pass it as an argument and assigns it to array.
Inside setters method the input will be get from user through Scanner.
I tried my best to give the details of problem i was facing.

public static void main(String[] args){
// TODO code application logic here
System.out.println("-------------------------------------------------");
System.out.println("Press 1 - 6 To Perform Any One Following Action ");
System.out.println("1. Insert New Contact ");
System.out.println("2. Delete Contact By Name ");
System.out.println("3. Replace Info From Contact ");
System.out.println("4. Search Contact By Name ");
System.out.println("5. Show All Contacts ");
System.out.println("6. Exit Program ");
System.out.println("-------------------------------------------------");
System.out.println();
System.out.println("Your Choice :");
 
AddressBook adBook = new AddressBook();
Staff staff = new Staff();
Address adress = new Address();
 
adBook.openFile();
//adBook.insertRecord(staff.getName(), staff.getDesignation(), staff.getAge(), adress.getAddress(), adress.getMobileNo());
adBook.insertRecord(staff.setName()); //void type not allowed here
adBook.closeFile();
}
 
java.io.PrintWriter pw;
static final int rows = 100;
static final int cols = 5;
String[][] record = new String[rows][cols];
 
public AddressBook(){
 
}
 
public void openFile(){
try{
 
pw = new java.io.PrintWriter("EmployeeRecords.txt");
} 
catch(FileNotFoundException e){
 
System.out.println("Error");
}
}
 
public void insertRecord(String s){
 
//Staff staf = new Staff();
System.out.print(record[0][0] = "Name" + "\t");
System.out.print(record[0][1] = "Designation" + "\t");
System.out.print(record[0][2] = "Age" + "\t");
System.out.print(record[0][3] = "Address" + "\t\t"); 
System.out.print(record[0][4] = "MobileNo" + "\t"); 
 
for(int r = 1; r < rows; r++){
for(int c = 0; c < cols; c++){
 
record[r][c] = s ; // if ignoring the above error so setName() method value was passed to insertRecord() method parameter s. So s contains the value So should I have to use getName() 
 
}
}
 
}