Could someone please fix the errors I have? //Abdullah.java public class Abdulla

Question

Could someone please fix the errors I have?

//Abdullah.java
public class Abdullah {

//private instance variabels
private String firstName;
  
//Set first name
public void setA_name(String firstName){
this.firstName=firstName;
}
  
//Return name
public String getA_name(){
return firstName;
}
  
//print courses to consoles
public void print_Aclass(String courses[]){
  
for (int i = 0; i < courses.length; i++)
{
System.out.println("Course ["+(i+1)+"] = "+courses[i]);
}
  
}
  
//print total credit scores
public int getTotalCredits(int credits[]){
  
int total=0;
for (int i = 0; i < credits.length; i++) {
total+=credits[i];
}
return total;
}
  
//check if the number is even and returns true otherwise false
public boolean checkIdEven(int num){
return num%2==0;
}

//Abdullah_data.java
public class Abdullah_data {
  
public static void main(String[] args) {
  
//Set first name
Abdullah.setA_name("Abdullah");
  
//Print name to console
System.out.println("Name : "+abdullah.getA_name());
  
//Create a string array
String courses[]={"ifmg 210", "ifmg 250", "chem 107", "math 115", "econ 122"};
//Create an integer array of credits
int credits[]={3,3,3,3,3};
  
//print courses
abdullah.print_Aclass(courses);
//print total credits
System.out.println("Total Credits : "+Abdullah.getTotalCredits(credits));
  
System.out.println("10 Even ? "+Abdullah.checkIdEven(03));
}
}//end of class Abdullah_data

Explanation / Answer

Hi,

I have made some changes in both the classes.In the class Abdullah when you are writing a setter method you should never give type as void when it has a strign argument and you should always return the value for that.

Abdullah.java:

// Set first name
   public String setA_name(String firstName) {
      
       return this.firstName = firstName;
   }

In Abdullah_data.java class,you should create an object for an instance method to be accessed as instance methods cannot be called directly.So the line of code changes like this:

Abdullah abdullah = new Abdullah();//create object for the class whose instance method you want to call
       abdullah.setA_name("Abdullah");//call method on that object reference

Here goes your changed code:

Abdullah.java:

package com.chegg.test;

public class Abdullah {
   // private instance variabels
   private String firstName;

   // Set first name
   public String setA_name(String firstName) {
      
       return this.firstName = firstName;
   }

   // Return name
   public String getA_name() {
       return firstName;
   }

   // print courses to consoles
   public void print_Aclass(String courses[]) {

       for (int i = 0; i < courses.length; i++) {
           System.out.println("Course [" + (i + 1) + "] = " + courses[i]);
       }

   }

Abdullah_data.java:

package com.chegg.test;

public class Abdullah_data {

   public static void main(String[] args) {

       //you should create an object for an instance methods as instance methods cannot be called directly
       // Set first name
       Abdullah abdullah = new Abdullah();
       abdullah.setA_name("Abdullah");

       // Print name to console
       System.out.println("Name : " + abdullah.getA_name());

       // Create a string array
       String courses[] = { "ifmg 210", "ifmg 250", "chem 107", "math 115", "econ 122" };
       // Create an integer array of credits
       int credits[] = { 3, 3, 3, 3, 3 };

       // print courses
       abdullah.print_Aclass(courses);
       // print total credits
       System.out.println("Total Credits : " + abdullah.getTotalCredits(credits));

       System.out.println("10 Even ? " + abdullah.checkIdEven(03));
   }
}// end of class Abdullah_data

Output:

Name : Abdullah
Course [1] = ifmg 210
Course [2] = ifmg 250
Course [3] = chem 107
Course [4] = math 115
Course [5] = econ 122
Total Credits : 15
10 Even ? false

Hope this helps you...

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