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  1. import java.util.Arrays;
  2. import java.util.stream.Collectors;
  3.  
  4. class Main
  5. {
  6.     public static void main( String[] args )
  7.     {
  8.         runTests();
  9.     }
  10.  
  11.     public static void runTests()
  12.     {
  13.         //# Input from original post
  14.         assertEquals( largestNumber( new int[]{ 3, 30, 34, 5, 9 } ), "9534330" );
  15.         //# Other tests from other comments
  16.         assertEquals( largestNumber( new int[]{ 30, 301 } ), "30301" );
  17.         assertEquals( largestNumber( new int[]{ 3, 30, 34, 90, 9 } ), "99034330" );
  18.         //# Invalid assertion
  19.         assertEquals( largestNumber( new int[]{ 1, 2, 3 } ), "123" );
  20.     }
  21.  
  22.     public static String largestNumber( int[] array )
  23.     {
  24.         String result = Arrays
  25.             .stream( array )
  26.             .mapToObj( String::valueOf )
  27.             .sorted( Main::sort )
  28.             .collect( Collectors.joining() );
  29.         System.out.println( result );
  30.         return result;
  31.     }
  32.  
  33.     public static int sort( String a, String b )
  34.     {
  35.         String t1 = a + b;
  36.         String t2 = b + a;
  37.         return Integer.compare( 0, Integer.valueOf( t1 ).compareTo( Integer.parseInt( t2 ) ) );
  38.     }
  39.  
  40.     private static void assertEquals( String actual, String expected )
  41.     {
  42.         if ( !actual.equals( expected ) )
  43.         {
  44.             System.out.println( "ERROR: Expected " + expected + " but found " + actual );
  45.         }
  46.     }
  47.  
  48. }
Success #stdin #stdout 0.14s 37448KB
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stdin
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Standard input is empty
stdout
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9534330
30301
99034330
321
ERROR: Expected 123 but found 321
https://ideone.com/LBAKE1
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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