Sorting a javabean

[AnithaTolgiri]

My question is how to sort a javabean on the basis of two fields.
I have to create a javabean and then sort it by some String type field and then by another String type field.When I sort it for the second time the sorted sequence of the first field should not change and I have to use the ArrayList for
it.I have used comparator here but when I sort it the sorted sequence of the first field changes.
Please help me .

[r035198x]

My question is how to sort a javabean on the basis of two fields.
I have to create a javabean and then sort it by some String type field and then by another String type field.When I sort it for the second time the sorted sequence of the first field should not change and I have to use the ArrayList for
it.I have used comparator here but when I sort it the sorted sequence of the first field changes.
Please help me .

What do you mean by "the sorted sequence of the first field changes."?
Did you read this tip?

[AnithaTolgiri]

My question is how to sort a javabean on the basis of two fields.
I have to create a javabean and then sort it by some String type field and then by another String type field.When I sort it for the second time the sorted sequence of the first field should not change and I have to use the ArrayList for
it.I have used comparator here but when I sort it the sorted sequence of the first field changes.
Please help me .

Initially I want to create a javabean whose parameters are name and some type, both are strings .I have to sort the bean first using the type field and then by name. when Iam sorting it by name the sequence of type also changes,this should not happen.I want to use the logic of order by clause of sql as the following:
Company OrderNumber
ABC Shop 5678
Sega 3412
Ws 6798
Ws 2312

Company OrderNumber
ABC Shop 5678
Sega 3412
Ws 2312
Ws 6798

Here I want to use ArrayList.Is it advisable to use the ArrayList.


My code is:

 import java.util.*; 
class test3
{
     private String Type=null;
     private String Name=null;
 
     test3(String a,String n)
     {
         Type=a;
         Name=n;
     }
 
     public String getName()
     {
         return Name;
 
     }
        public void setName(String n)
        {
            this.Name=n;
        }
 
        public String Type()
        {
            return Alerttype;
 
        }
        public void setType(String a)
        {
         this.Type=a;    
}
 
        static Comparator sortByType = new Comparator(){
            public int compare(Object ch1, Object ch2) {
                String Type1 = ((test3) ch1).getType();
                String Type2 = ((test3) ch2).getType();
 
                if(! alertType1.equals( Type2))
                return alertType1.compareTo( Type2);
                else
 
                    return 0;
                }
                };
 
                static Comparator sortByName = new Comparator(){
                    public int compare(Object ch1, Object ch2) {
 
                        String name1 = ((test3)ch1).getName();
                        String name2= ((test3)ch2).getName();
 
                        if(! name1.equals(name2))
                        return name1.compareTo( name2);
                        else
 
                     return 0;    
                    }
                        };
                    public String toString(){
                        return Type + ":"+Name;
                        }
                        }
 
                        public class Show2{
                        public Show2() {
                        super();
                        }
                        public static void main(String[] args) {
                        ArrayList a = new ArrayList();
 
                        test3 t = new test3("Check","name1");
                        a.add(t);
                        t=null;
 
                        t = new test3("Create","name2");
                        a.add(t);
                        t=null;
 
                        t = new test3("Attempt","name3");
                        a.add(t);
                        t=null; 
                        Object[] o = a.toArray();
                        System.out.println("before sorting");
                        int size1 = a.size();
                        for(int i =0; i<a.size();i++)
                        {
                        System.out.println((test3)o[i]);
 
                        }
                        Arrays.sort(o,test3.sortByType);
                        System.out.println("After sorting by Type");
                        int size = a.size();
                        for(int i =0; i<a.size();i++)
                        {
                        System.out.println((test3)o[i]);
 
                        }
                        System.out.println("after sorting by name");
                        Arrays.sort(o,test3.sortByName);
                        int size2 = a.size();
                        for(int i =0; i<a.size();i++)
                        {
                        System.out.println((test3)o[i]);
 
                        }
                        }
                        }     
 

This is the output:
before sorting
Check:name1
Create:name2
Attempt:name3
After sorting by Type
Attempt:name3
Check:name1
create:name2
after sorting by name
Check:name1
create:name2
Attempt:name3

Here After sorting by name order of type should not change.

Thanks & Regards,
Anitha Tolgiri

[AnithaTolgiri]

Could any one suggest me how to do it.