Mega Code Archive
Comparator Example For User Defined Class
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import org.apache.commons.collections.comparators.ComparatorChain;
import java.util.Arrays;
import java.util.Comparator;
public class ComparatorExampleForUserDefinedClass {
public static void main(String args[]) {
prepareData();
ComparatorChain chain = new ComparatorChain();
chain.addComparator(new NameComparator());
chain.addComparator(new NumberComparator());
printArray(dataArray);
Arrays.sort(dataArray, chain);
printArray(dataArray);
}
private static void prepareData() {
dataArray[0] = "S4";
dataArray[1] = "Sa";
dataArray[2] = "K";
dataArray[3] = "K4";
dataArray[4] = "W";
dataArray[5] = "Sha";
dataArray[6] = "War";
}
private static void printArray(String[] array) {
System.err.println("---- Elements in Array ---- ");
for(int i = 0; i < array.length; i++) {
System.err.print(array[i] + ", ");
}
System.err.println("");
}
private static String[] dataArray = new String[7];
}
class NameComparator implements Comparator {
public int compare(Object o1, Object o2) {
if(o1 instanceof String && o2 instanceof String) {
String s1 = (String)o1;
String s2 = (String)o2;
s1 = s1.substring(0, s1.indexOf("-"));
s2 = s2.substring(0, s2.indexOf("-"));
return s1.compareTo(s2);
}
return 0;
}
}
class NumberComparator implements Comparator {
public int compare(Object o1, Object o2) {
if(o1 instanceof String && o2 instanceof String) {
String s1 = (String)o1;
String s2 = (String)o2;
Integer i1 = new Integer(s1.substring(s1.indexOf("-"), s1.length()));
Integer i2 = new Integer(s2.substring(s2.indexOf("-"), s2.length()));
return i1.compareTo(i2);
}
return 0;
}
}
ApacheCollectionComparatorExampleForUserDefinedClass.zip( 516 k)
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