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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
 
static class A implements Comparable<A> {
 
 
    @Override
    public int compareTo(A a) { return 0;}
 
    public Integer compareTo(Object o) {
return Integer.valueOf(1);}
 
 
 
}
 
 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

Main.java:15: error: name clash: compareTo(A) in A overrides a method whose erasure is the same as another method, yet neither overrides the other
    public int compareTo(A a) { return 0;}
               ^
  first method:  compareTo(Object) in A
  second method: compareTo(T) in Comparable
  where T is a type-variable:
    T extends Object declared in interface Comparable
Main.java:17: error: name clash: compareTo(Object) in A and compareTo(T) in Comparable have the same erasure, yet neither overrides the other
    public Integer compareTo(Object o) {
                   ^
  where T is a type-variable:
    T extends Object declared in interface Comparable
2 errors

Standard output is empty