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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class Foo{
  8. 	final int val;
  9. 	Foo(final int val){
  10. 		this.val = val;
  11. 	}
  12. 	int getVal(){
  13. 		return val;
  14. 	}
  15. 	public String toString(){
  16. 		return String.valueOf(val);
  17. 	}
  18. }
  19.  
  20. class Ideone
  21. {
  22. 	public static void main (String[] args) throws java.lang.Exception
  23. 	{
  24. 		List<Foo> l = new ArrayList<Foo>();
  25. 		l.add(new Foo(3));
  26. 		l.add(new Foo(2));
  27. 		l.add(new Foo(1));
  28.  
  29. 		System.out.println(l);
  30. 		Collections.sort(l, Comparator.comparingInt(Foo::getVal));
  31. 		System.out.println(l);
  32. 	}
  33. }
Success #stdin #stdout 0.08s 711168KB
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Standard input is empty
stdout
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[3, 2, 1]
[1, 2, 3]
https://ideone.com/UeEhvg
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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