Question

Fill in the find method and numMale method

public class ComparableDemo
{
   public void init(Object arr[])
   {
       arr[0] = new Employee("Abby", 3000, 1, null, 'f');
       arr[1] = new Employee("John", 2000, 2, (Employee)arr[0], 'm');
       arr[2] = new Employee("Tim", 2000, 2, (Employee)arr[0], 'm');
       arr[3] = new Employee("Tony", 1000, 3, (Employee)arr[0], 'm');  
   }
  
   //this method finds and returns the Employee object in the array whose name equals to
   //the name string. If the name is not found it returns null.
   public Object find(String name, Object arr[])
   {
      

   }
  
   //this method finds how many male Employees are stored in the array arr
   public int numMale(Object arr[])
   {
      

   }
      
   public static void main(String args[])
   {
       ComparableDemo demo = new ComparableDemo();
       Object arr[] = new Object[4];
      
       demo.init(arr);
      
       Object target = demo.find("john", arr);
       System.out.println("Employee with name John is found:\n" + target);
      
       int n = demo.numMale(arr);
       System.out.println("There are " + n + " male employees in the array.");
   }
}

Answer 1

public class ComparableDemo
{
  public void init(Object arr[])
  {
    arr[0] = new Employee("Abby", 3000, 1, null, 'f');
    arr[1] = new Employee("John", 2000, 2, (Employee)arr[0], 'm');
    arr[2] = new Employee("Tim", 2000, 2, (Employee)arr[0], 'm');
    arr[3] = new Employee("Tony", 1000, 3, (Employee)arr[0], 'm');
  }

  //this method finds and returns the Employee object in the array whose name equals to
  //the name string. If the name is not found it returns null.
  public Object find(String name, Object arr[])
  {
    for(int i = 0;i<arr.length;i++){
      if (arr[i].name.equals(name)){
        return arr[i];
      }
    }
    return null;
  }

  //this method finds how many male Employees are stored in the array arr
  public int numMale(Object arr[])
  {
    int count = 0;
    for(int i = 0;i<arr.length;i++){
      if(arr[i].gender == 'm'){
        count += 1;
      }
    }
    return count;
  }

  public static void main(String args[])
  {
    ComparableDemo demo = new ComparableDemo();
    Object arr[] = new Object[4];

    demo.init(arr);

    Object target = demo.find("john", arr);
    System.out.println("Employee with name John is found:\n" + target);

    int n = demo.numMale(arr);
    System.out.println("There are " + n + " male employees in the array.");
  }
}