Comparator Example

1) ComparatorTest


package com.srini.collections;

import java.util.ArrayList;
import java.util.Collections;

public class ComparatorTest {
public static void main(String[] args) {
HDTV tv1 = new HDTV(55, "Samsung");
HDTV tv2 = new HDTV(60, "Sony");
HDTV tv3 = new HDTV(42, "Panasonic");

ArrayList<HDTV> al = new ArrayList<HDTV>();
al.add(tv1);
al.add(tv2);
al.add(tv3);

Collections.sort(al, new SizeComparator());
for (HDTV a : al) {
System.out.println(a.getBrand());
}
}

}

=======================

package com.srini.collections;

public class HDTV {

private int size;

private String brand;

 

public HDTV(int size, String brand) {

this.size = size;

this.brand = brand;

}

 

public int getSize() {

return size;

}

 

public void setSize(int size) {

this.size = size;

}

 

public String getBrand() {

return brand;

}

 

public void setBrand(String brand) {

this.brand = brand;

}

}

===============

package com.srini.collections;

import java.util.Comparator;

public class SizeComparator  implements Comparator<HDTV>{

//@Override

public int compare(HDTV tv1, HDTV tv2) {

int tv1Size = tv1.getSize();

int tv2Size = tv2.getSize();

 

if (tv1Size > tv2Size) {

return 1;

} else if (tv1Size < tv2Size) {

return -1;

} else {

return 0;

}

}

}