You can try the following..
This is the Object for each row data.
------------------------------------
import java.util.*;
public class TwoDArraySort implements Comparable
{
// This Map will contain something like
// col1=1, col2=123,col3=23..
private Map _colNameWithVal;
TwoDArraySort(Map val)
{
_colNameWithVal = val;
}
public Map getAllData()
{
return _colNameWithVal;
}
public Object getVal(String colName)
{
return _colNameWithVal.get(colName);
}
public int compareTo(Object o1)
{
return 0;
}
}
--------------------------------------------
This is the gerenic comparator sorter. Here u can add other cases like
Date..
import java.util.*;
public class TwoDArrayComparator implements Comparator
{
String sorter;
public TwoDArrayComparator(String sorter) {
this.sorter = sorter;
}
public int compare(Object obj1,Object obj2)
{
System.out.println();
TwoDArraySort tdas1 = (TwoDArraySort)obj1;
TwoDArraySort tdas2 = (TwoDArraySort)obj2;
int diff = 0;
if (sorter == null )
{
int tmp = tdas1.compareTo( tdas2 );
if ( tmp != 0) return tmp;
else return 1;
}
else
{
System.out.println("this.sorter="+this.sorter+" tdas1="+tdas1);
Object val1 = tdas1.getVal(this.sorter);
Object val2 = tdas2.getVal(this.sorter);
if (val1 instanceof Integer)
{
int value1 = ((Integer)val1).intValue() ;
int value2 = ((Integer)val2).intValue();
diff = (value2 - value1);
System.out.println("Case Integer: value2="+value2+"
value1="+value1);
}
else if (val1 instanceof Long)
{
long value1 = ((Long)val1).longValue();
long value2 = ((Long)val2).longValue();
diff = (value2>value1)?1:((value2==value1)?0:-1);
System.out.println("Case Long: value2="+value2+"
value1="+value1);
}
else if (val1 instanceof Double)
{
double value1 = 100*((Double)val1).doubleValue() ;
double value2 = 100*((Double)val2).doubleValue();
diff = (value2>value1)?1:((value2==value1)?0:-1);
System.out.println("Case Double: value2="+value2+"
value1="+value1);
}
else
{
String strVal1 = val1.toString();
String strVal2 = val2.toString();
diff = strVal2.compareTo(strVal1);
System.out.println("Case Else: strVal2="+strVal2+"
strVal1="+strVal1);
}
if (diff != 0)
return diff;
else
return tdas1.compareTo( tdas2 );
}
}
}
-------------------------------------------------------------------
This is the sample Driver program
import java.util.*;
public class Driver
{
public static void main(String[] args )
{
TwoDArraySort[] twoDs = new TwoDArraySort[3];
Map colWithVal = new HashMap(3);
colWithVal.put("col1",Integer.valueOf("1"));
colWithVal.put("col2",Integer.valueOf("123"));
colWithVal.put("col3",Integer.valueOf("23"));
twoDs[0] = new TwoDArraySort(colWithVal);
colWithVal = new HashMap(3);
colWithVal.put("col1",Integer.valueOf("3"));
colWithVal.put("col2",Integer.valueOf("34"));
colWithVal.put("col3",Integer.valueOf("34"));
twoDs[1] = new TwoDArraySort(colWithVal);
colWithVal = new HashMap(3);
colWithVal.put("col1",Integer.valueOf("23"));
colWithVal.put("col2",Integer.valueOf("324"));
colWithVal.put("col3",Integer.valueOf("314"));
twoDs[2] = new TwoDArraySort(colWithVal);
System.out.println("Before sorting..");
for (int i=0; i<3; i++)
{
System.out.println(i+">>"+twoDs[i].getAllData());
}
Arrays.sort(twoDs, new TwoDArrayComparator("col2"));
System.out.println("After sorting..");
for (int i=0; i<3; i++)
{
System.out.println(i+">>"+twoDs[i].getAllData());
}
}
}
Hope it will help you.
Nikhil R Silsarma
Developer
DigitalRUM UK Ltd.
Tel: 020 7604 2049
-----Original Message-----
From: KEVIN LI [mailto:[EMAIL PROTECTED]]
Sent: 26 February 2002 19:36
To: JRun-Talk
Subject: 2d array sorting
Hi .
did any one knows there is some better way to do 2D array sort.
suppose I have some data like
[ col1 col2 col3 col4]
[1 123 23 234]
[3 34 34 34]
[23 343 34 34]
and I want sort them by any column .
Thanks
Kevin
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