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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. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		    String[] nombres = {"hola 1", "hola 5", "hola 15", "hola 2"};    
  13.  
  14.     String[][] nombresAOrdenar = new String[nombres.length][2]; 
  15.  
  16.     for (int i=0; i< nombres.length ; i++) {
  17.         //Extrae valores de array, el numero será la columna a ordenar.
  18.         String[] parts = nombres[i].split(" ");
  19.         nombresAOrdenar[i][0] =  parts[1];
  20.         nombresAOrdenar[i][1] =  parts[0];        
  21.     }  
  22.  
  23.     //Ordena valores por columna 1 (indice 0)
  24.     Arrays.sort(nombresAOrdenar, new ColumnComparator(0));
  25.  
  26.    //Agrega valores ordenados a array original 
  27.    for (int j=0; j< nombres.length ; j++) {           
  28.         nombres[j] = nombresAOrdenar[j][1].toString() + " "+ nombresAOrdenar[j][0].toString();
  29.    }  
  30.  
  31.    //Imprime valores de Array ya ordenado
  32.    for (String nombre : nombres) {
  33.         System.out.print(nombre + ", ");
  34.    }
  35. 	}
  36.  
  37.  
  38.  
  39. 	    static class ColumnComparator implements Comparator {
  40. 	int columnToSort;
  41. 	ColumnComparator(int columnToSort) {
  42. 		this.columnToSort = columnToSort;
  43. 	}
  44. 	//sobreescribe metodo compare
  45. 	public int compare(Object o1, Object o2) {
  46. 		String[] row1 = (String[]) o1;
  47. 		String[] row2 = (String[]) o2;
  48.  
  49.                 int res = Integer.parseInt(row1[0].toString()) -  Integer.parseInt(row2[0].toString()); 		
  50.                 return res;
  51. 	}
  52. }
  53.  
  54.  
  55.  
  56.  
  57. }
Success #stdin #stdout 0.05s 4575232KB
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Standard input is empty
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hola 1, hola 2, hola 5, hola 15,
https://ideone.com/DbEF2I
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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