[java]代码库package example;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

public class Demo {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Demo demo = new Demo();

List list = new ArrayList(); // your Car list

Student st = demo.new Student();

st.setName("sekhar");

st.setCity("bbsr");

st.setRoll(23);

list.add(st);

st = demo.new Student();

st.setName("himanshu");

st.setCity("agra");

st.setRoll(23);

list.add(st);

st = demo.new Student();

st.setName("nitin");

st.setCity("delhi");

st.setRoll(23);

list.add(st);

st = demo.new Student();

st.setName("nitin");

st.setCity("delhi");

st.setRoll(22);

list.add(st);

st = demo.new Student();

st.setName("nitin");

st.setCity("bbsr");

st.setRoll(23);

list.add(st);

st = demo.new Student();

st.setName("arun");

st.setCity("patna");

st.setRoll(23);

list.add(st);

st = demo.new Student();

st.setName("arun");

st.setCity("kendrapara");

st.setRoll(23);

list.add(st);

System.out.println("before sort");

System.out.println("Name:" + "-------------------" + "City...........roll");

for (Student st1 : list) {

System.out.println(st1.getName() + " --------------" + st1.getCity() + "------------" + st1.getRoll());

}

Collections.sort(list, demo.new CarHorsePowerComparator());

System.out.println("after sort");

System.out.println("Name:" + "-------------------" + "City...............roll");

for (Student st1 : list) {

System.out.println(st1.getName() + " --------------" + st1.getCity() + "------------" + st1.getRoll());

}

}

public class Student {

String name;

String city;

int roll;

public int getRoll() {

return roll;

}

public void setRoll(int roll) {

this.roll = roll;

}

public String getCity() {

return city;

}

public void setCity(String city) {

this.city = city;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

class CarHorsePowerComparator implements Comparator {

public int compare(Student stu, Student stu1) {

int sort = (stu.getName() + stu.getCity() + stu.getRoll()).compareTo((stu1.getName() + stu1.getCity() + stu1.getRoll()));

return sort;

}

}

}