CompareTo How can this kind of program should be written in order to obtain the correct results ?

The following procedure is to practice SortedSet and TreeSet, but I , I do not get the right result is obtained the same results such as an address , I think it might be my compareTo function did not write , I now empty it out, hope you help me to fill out . Or is this program still missing other steps ?

import java.util.*;
  
  public class Test
  {
  		public static void main(String[] args)
  		{
  			
  			  SortedSet<A> parts = new TreeSet<A>();
  			  parts.add(new A("rst", 789));		
  			  parts.add(new A("efg", 456));
  			  parts.add(new A("abc", 123));
  			  			  			  
  			  System.out.println(parts);
  			  
  			  SortedSet<A> sortname = new TreeSet<A>
  			  (new 
  			    Comparator<A>()
  				    {
  				    	 public int compare(A a, A b)	
  				    	 {
  				    	 		 String x = a.getName();
  						    	 String y = b.getName();
  						    	 
  						    	 return x.compareTo(y);
  				    	 }
  				    	 
  				    }
  			  );
  			  
  			  sortname.addAll(parts);
  			  System.out.println(sortname);
  			  			  				
  		}	
  }
  
  class A implements Comparable<A>
  {
  		public A(String name, int number)
  		{
  				this.name = name;
  				this.number = number;	
  		}
  		
  		public String getName()
  		{
  				return name;	
  		}
  		
  		public int getNumber()
  		{
  				return number;	
  		}		
  		
  		public int compareTo(A other)
  		{
  				
  				
  		}
  		
  		private String name;
  		private int number;	
  }

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is to follow what you shoot ?
by digital
return x.number-y.number;
------ Solution -------------------------- ------------------

  
by string arrangements.   
Even numeric row, I want to ask is class A compareTo in how to write , not in the main function compare . Please provide further guidance.   
  
 
same
public int compareTo (A other)
{
return this.name.compareTo (other.name) ;

}
------ Solution ------------------- -------------------------
landlord overridden in A class about toString () method .
------ Solution ---------------------------------------- ----
are to be compared by name , sequential course as it
------ Solution --------------------- -----------------------
TreeSet is sorted in ascending order by default , so as
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by string arrangements.
Even numeric row, I want to ask is class A compareTo in how to write , not in the main function compare . Please provide further guidance.


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by string arrangements.     
Even numeric row, I want to ask is class A compareTo in how to write , not in the main function compare . Please provide further guidance.     
    
         
same   
public int compareTo (A other)   
{   
return this.name.compareTo (other.name) ;   
  
}  
The results obtained are how



moderator , why not have a screenshot function CSDN own way , every time I open the QQ now shots are saved , and then select the upload, good trouble .
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would not have a problem with Comparable
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indeed, as you said, plus toString in class A in just fine. I want to think about why ?
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I actually use on the third floor moderators bit puzzled ,

public int compareTo(A other)
          {
                   return this.name.compareTo(other.name); 
                   
          }

compareTo method name , how they use the methods inside the compareTo?
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Tieshanglai I put together a good program , but I have a question:

import java.util.*;
  
  public class Test
  {
  		public static void main(String[] args)
  		{
  			
  			  SortedSet<A> parts = new TreeSet<A>();
  			  parts.add(new A("rst", 789));	
  			  parts.add(new A("opq", 589));	
  			  parts.add(new A("efg", 456));
  			  parts.add(new A("ttt", 621));
  			  parts.add(new A("abc", 123));
  			  			  			  
  			  System.out.println(parts);
  			  
  			  SortedSet<A> sortname = new TreeSet<A>
  			  (new 
  			    Comparator<A>()
  				    {
  				    	 public int compare(A a, A b)	
  				    	 {
  				    	 		 String x = a.getName();
  						    	 String y = b.getName();
  						    	 
  						    	 return x.compareTo(y);
  				    	 }
  				    	 
  				    }
  			  );
  			  
  			  sortname.addAll(parts);
  			  System.out.println(sortname);
  			  			  				
  		}	
  }
  
  class A implements Comparable<A>
  {
  		public A(String name, int number)
  		{
  				this.name = name;
  				this.number = number;	
  		}
  		
  		public String getName()
  		{
  				return name;	
  		}
  		
  		public int getNumber()
  		{
  				return number;	
  		}		
  		
  		public String toString()
  		{
  			return name;	
  		}
  		
  		public int compareTo(A other)
  		{
  				 // return this.number-other.number;
  				 return this.name.compareTo(other.name);
  		}
  		
  		private String name;
  		private int number;	
  }

I think System.out.println (parts); with System.out.println (sortname); should not be the same as the order is displayed , but the result seems to be the same.


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are to be compared by name , sequential course as it  

System.out.println (parts); should be sorted before the output fishes Yeah , why the output sorted the same?
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this way , thank you.