Sorting the Records
i have a policy record set and i need to sort them based onName and thenpolicy number.For sorting i am
using the java.util.Comparator.But when i try to apply 2java.util.Comparator then I will get the sorted based on the lastjava.util.Comparator applied.
How can i sot the ploicy records based on both java.util.Comparator.
The code below
policy.java
publicclass Policy
{
public String record_type;
public String policy;
public String getSME_NAME()
{
return SME_NAME;
}
publicvoid setSME_NAME(String sme_name)
{
SME_NAME = sme_name;
}
public String SME_NAME;
public String getPolicy()
{
return policy;
}
publicvoid setPolicy(String policy)
{
this.policy = policy;
}
SortPolicy.java
-
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
publicclass Employee
{
publicstaticfinal Comparator POLICY_ORDER =new Comparator( ){
publicint compare(Object o1, Object o2)
{
Integer p1 =new Integer(((Policy)o1).getPolicy());
Integer p2=new Integer(((Policy)o2).getPolicy());
return p1.compareTo(p2);
}
};
publicstaticfinal Comparator SME_NAME_ORDER =new Comparator( )
{
publicint compare(Object o1, Object o2){
String p1 = ((Policy)o1).getRecord_type();
String p2 = ((Policy)o2).getRecord_type();
return p1.compareTo(p2);
}
};
publicstaticvoid main(String[] args)
{
Policy p1=new Policy();
p1.setPolicy("5197");
p1.setSME_NAME("AIRCHANNEL LTD");
Policy p2=new Policy();
p2.setPolicy("5198");
p2.setSME_NAME("AIRCHANNEL LTD");
Policy p1=new Policy();
p1.setPolicy("5001");
p1.setSME_NAME("BAS LTD");
Policy p3=new Policy();
p3.setPolicy("5004");
p3.setSME_NAME("ZEE LTD");
Object s[]=new Policy[]{p1,p2,p3};
java.util.List al=new ArrayList();
for(int i=0;i<s.length;i++)
al.add(i,s[i]);
Collections.sort(al,Employee.SME_NAME_ORDER );
Collections.sort(al,Employee.POLICY_ORDER);//><-- This will Apply only not retaining the ollections.sort(al,Employee.SME_NAME_ORDER );
Iterator i = al.iterator();
while(i.hasNext())
{
Policy p=(Policy)i.next();
System.out.println(p.getSME_NAME());
System.out.println(p.getPolicy());
}
I need to get
AIRCHANNEL LTD
5197
AIRCHANNEL LTD
5198
BAS LTD
5001
ZEE LTD
5004
}
}
If I understood right, you want to compare in a single time, first by name and then by policy number. For that you can do it like this (it's a one time shot!):
public class Policyimplements Comparable
{
public String record_type;
public String policy;
public String getSME_NAME()
{
return SME_NAME;
}
public void setSME_NAME(String sme_name)
{
SME_NAME = sme_name;
}
public String SME_NAME;
public String getPolicy()
{
return policy;
}
public void setPolicy(String policy)
{
this.policy = policy;
}
public int compareTo(Object o) {
Policy po = (Policy)o;
if (policy.compareTo(po.policy < 0)
return -1;
if (policy.compareTo(po.policy > 0)
return 1;
//policy names are equal, compare record_type
if (record_type.compareTo(po.record_type < 0)
return -1;
if (record_type.compareTo(po.record_type > 0)
return 1;
//all fields are equal
return 0;
}
}
I haven't tried the code but is something like this and forget about those inner classes
I did it using apache utils classes
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.comparators.ComparableComparator;
import org.apache.commons.collections.comparators.ComparatorChain;
public class Employee
{
public static final Comparator POLICY_ORDER = new Comparator( ) {
public int compare(Object o1, Object o2)
{
Integer p1 = new Integer(((Policy)o1).getPolicy());
Integer p2= new Integer(((Policy)o2).getPolicy());
return p1.compareTo(p2);
}
};
public static final Comparator RECORD_TYPE_ORDER = new Comparator( )
{
public int compare(Object o1, Object o2) {
String p1 = ((Policy)o1).getRecord_type();
String p2 = ((Policy)o2).getRecord_type();
return p1.compareTo(p2);
}
};
public static void main(String[] args)
{
ComparatorChain c = new ComparatorChain();
c.addComparator(Employee.RECORD_TYPE_ORDER);
c.addComparator(Employee.POLICY_ORDER);
Policy p2=new Policy();
p2.setRecord_type("C");
p2.setPolicy("5197");
p2.setSME_NAME("AIRCHANNEL LTD");
Policy p21=new Policy();
p21.setRecord_type("C");
p21.setPolicy("5197");
p21.setSME_NAME("AIRCHANNEL LTD");
Policy p7=new Policy();
p7.setRecord_type("P");
p7.setPolicy("5001");
p7.setSME_NAME("BAS LTD");
Policy p3=new Policy();
p3.setRecord_type("C");
p3.setPolicy("5004");
p3.setSME_NAME("ZEE LTD");
Object s[]=new Policy[]{p2,p3,p7,p21};
java.util.List al=new ArrayList();
for(int i=0;i<s.length;i++)
al.add(i,s[i]);
Collections.sort(al,c);
Iterator ii = al.iterator();
while(ii.hasNext())
{
Policy p=(Policy)ii.next();
System.out.println(p.getSME_NAME());
//System.out.println(p.getClient_code());
}
}
}
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