fork download

copy

import java.util.ArrayList;
import java.util.Collections;
 
interface bc {}
 
class b implements bc, Comparable<bc> {
	String str1;
 
	b (String var) {
		str1 = var;
	}
 
	public int compareTo(bc object) {
		if(object instanceof b)
			return str1.compareTo(((b)object).str1);
 
		if(object instanceof c)
			return str1.compareTo(((c)object).str2);
 
		return 0;
	}
}
 
class c implements bc, Comparable<bc> {
	String str2;
 
	c (String var) {
		str2 = var;
	}
 
	public int compareTo(bc object) {
		if(object instanceof b)
			return str2.compareTo(((b)object).str1);
 
		if(object instanceof c)
			return str2.compareTo(((c)object).str2);
 
		return 0;
	}
}
 
public class Main {
	public static void main(String[] args) {
		b obj1 = new b("aman");
		c obj2 = new c("monster");
		b obj3 = new b("back");
		c obj4 = new c("a");
 
		ArrayList<bc> list = new ArrayList<bc>();
 
		list.add(obj1);
		list.add(obj2);
		list.add(obj3);
		list.add(obj4);
 
		System.out.println("unsorted list = "+list);
		Collections.sort(list);
		System.out.println("sorted list = "+list);
	}
}

Main.java:57: error: no suitable method found for sort(ArrayList<bc>)
		Collections.sort(list);
		           ^
    method Collections.<T#1>sort(List<T#1>,Comparator<? super T#1>) is not applicable
      (cannot instantiate from arguments because actual and formal argument lists differ in length)
    method Collections.<T#2>sort(List<T#2>) is not applicable
      (inferred type does not conform to declared bound(s)
        inferred: bc
        bound(s): Comparable<? super bc>)
  where T#1,T#2 are type-variables:
    T#1 extends Object declared in method <T#1>sort(List<T#1>,Comparator<? super T#1>)
    T#2 extends Comparable<? super T#2> declared in method <T#2>sort(List<T#2>)
1 error

Standard output is empty