illegal start of expression

I have been tired to find the reason for illegal start of expression help

import java.util.ArrayList;
import java.util.Collections;
import java.lang.Comparable;
class  CollectionsClass implements Comparable<CollectionsClass>
{
	
	String ss;
	CollectionsClass(String s){
		ss=s;
	}
	String get()
	{
		return ss;
	}
	public static void main(String[] args) 
	{
		ArrayList<String> o=new ArrayList<String>();
		o.add(0,"a");
		o.add("b");
		o.add("c");
		o.add("e");
		o.add("d");
		Collections.reverse(o);
		for(Object b:o){
			System.out.println(b);		
		}
		System.out.println("");
		Collections.sort(o);
		for(Object b:o){
			System.out.println(b);		
		}

CollectionsClass c1=new CollectionsClass("f");
		CollectionsClass c2=new CollectionsClass("e");
		CollectionsClass c3=new CollectionsClass("d");
		CollectionsClass c4=new CollectionsClass("c");

ArrayList<CollectionsClass> o1=new ArrayList<CollectionsClass>();
		o1.add(0,c1);
		o1.add(c2);
		o1.add(c3);
		o1.add(c4);
	
		/*Collections.reverse(o1);
		for(Object b:o1){
			System.out.println(b);		
		}*/
		System.out.println("");
		Collections.sort(o1);
		for(Object b:o1){
			System.out.println(b);		
		}

public int compareTo(CollectionsClass c){
			return ((this.ss).compareTo(c.ss));
		}

}
}

the compareTo() method should be declared outside the main method. i remember this happening to me many times and pulling my hairs when i realised the mistake.

saloni jhanwar wrote:I have been tired to find the reason for illegal start of expression help

That compile time error would also show the line number where this is happening. Have you checked that specific line and code around it? Hint: Pay attention to the line where the implementation of compareTo method has started.

gurpeet singh wrote:the compareTo() method should be declared outside the main method. i remember this happening to me many times and pulling my hairs when i realised the mistake.

ouch