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Index › Programming Questions & Help › Syntax Questions › Use of Comparator

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Use of Comparator? (Read 908 times)

beachmeat

Use of Comparator?
Sep 13^th, 2005, 11:01am

Hi,

how is it possible to use Comparator with P5? I get a compiler error with this code...I think its because it has to be JRE 5.0, can that be? Is it possible to run P5 with 5?

Code:


import java.util.Arrays; 
import java.util.Comparator; 

public class Test { 
    public static void main( String[] args ) { 
        int[][] test = new int[][]{ 
                {1, 4}, 
                {2, -8}, 
                {3, 5} 
        }; 
        
        System.out.println( "unsorted:" ); 
        print( test ); 
        
        Arrays.sort( test, new Comparator<int[]>(){ 
            public int compare( int[] o1, int[] o2 ) { 
                return o1[1] - o2[1]; 
            } 
        }); 
        
       System.out.println( "sorted:");
        print( test ); 
    } 
    
    public static void print( int[][] test ){ 
        for( int i = 0; i < test.length; i++ ) 
            System.out.println( Arrays.toString( test[i] )); 
    } 
}

home sweet home

fry

Re: Use of Comparator?
Reply #1 - Sep 13^th, 2005, 4:55pm

right, that's syntax that's specific to java 1.5 and won't work anywhere else. we don't support java 1.5 for processing and probably won't anytime too soon:
http://processing.org/faq/platforms.html#java

if you're really wanting the 1.5 language stuff, you should use eclipse or something like that.. more info on that over in the "integration" board.

beachmeat

Re: Use of Comparator?
Reply #2 - Sep 13^th, 2005, 5:58pm

I guess if I have JRE 5 installed it should work inside P5, or am I mistaken?

Well in case ever anybody looks into that topic again, you can solve it with a normal comparator:

Code:


import java.util.Arrays;  
import java.util.Comparator;  
 
int[][] test = new int[][]{   {1, 4}, {2, -8},  {3, 5}  };
       
         
    System.out.println( "unsorted:" );  
    for(int i=0;i<3;i++)
      print( test[i][0] + " > " + test[i][1] + "\n");  
         
    Arrays.sort( test, new Comparator()
    { 
      public int compare( Object o1, Object o2 ) 
      { 
        int[] a1 = (int[]) o1; 
        int[] a2 = (int[]) o2; 
        return a1[1] - a2[1] ; 
      }
    }
    ); // sort
    
         
    System.out.println( "sorted:" );  
    for(int i=0;i<3;i++)
      print( test[i][0] + " > " + test[i][1] + "\n");

home sweet home

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: Use of Comparator? Reply #3 - Sep 14^th, 2005, 4:45am beachmeat wrote on Sep 13^th, 2005, 5:58pm: I guess if I have JRE 5 installed it should work inside P5, or am I mistaken nope, not if i've already said it won't work and that you have to use eclipse. the preprocessor doesn't even understand that syntax, neither does jikes, the compiler that's used underneath.

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