Hi Friend,

Try the following code:

import java.util.*;

class ShowData implements Comparable{
int rollNo;
String name;
int marks;
String grade;

public void setRollNo(int rollNo){
this.rollNo=rollNo;
}
public int getRollNo(){
return rollNo;
}

public void setName(String name){
this.name=name;
}
public String getName(){
return name;
}

public void setMarks(int marks){
this.marks=marks;
}
public int getMarks(){
return marks;
}

public void setGrade(String grade){
this.grade=grade;
}
public String getGrade(){
return grade;
}
public int compareTo(Object Student) throws ClassCastException {
if (!(Student instanceof ShowData))
throw new ClassCastException("Error");
int studentmarks = ((ShowData) Student).getMarks();
return this.marks - studentmarks;
}
}
public class DisplayMarks{
public static void main(String[]args){
ShowData data[]=new ShowData[5];
data[0] = new ShowData();
data[0].setRollNo(1);
data[0].setName("A");
data[0].setMarks(85);
data[0].setGrade("B");

data[1] = new ShowData();
data[1].setRollNo(2);
data[1].setName("B");
data[1].setMarks(75);
data[1].setGrade("C");

data[2] = new ShowData();
data[2].setRollNo(3);
data[2].setName("C");
data[2].setMarks(95);
data[2].setGrade("A+");

data[3] = new ShowData();
data[3].setRollNo(4);
data[3].setName("D");
data[3].setMarks(92);
data[3].setGrade("A");

data[4] = new ShowData();
data[4].setRollNo(5);
data[4].setName("E");
data[4].setMarks(88);
data[4].setGrade("B");

for(int i=0;i<5;i++){
ShowData show = data[i];
int no=show.getRollNo();
String name = show.getName();
int marks = show.getMarks();
String grade = show.getGrade();
System.out.println(no + " " + name + " " + marks+" " +grade);
}
Arrays.sort(data);
System.out.println("********Sorted by marks********");

for (int i=0; i<5; i++) {
ShowData show = data[i];
int no=show.getRollNo();
String name = show.getName();
int marks = show.getMarks();
String grade = show.getGrade();
System.out.println(no + " " + name + " " + marks+" " +grade);
}
}
}
Thanks