Sort array of type Two-dimensional String in alphabetical order in Java

[ad_1]

I'm doing an exercise but I get an error when I get to the line where it is ordered, I'm sorting it with the sort function, here the exercise, I already made a first version that I leave here, and I also resolved how to order them but he just orders me the rows, and I want him to order me by row and columns, thank you

Exercise:

Capture a matrix that allows me to store names of people, show the
original matrix and
Sort them in alphabetical order.

Code

import java.util.Arrays;
import java.util.Scanner;

public class NombresPersonas 

public static void main(String[] args) 

 Scanner sc = new Scanner(System.in);

 //array a ordenar
 //String cadenas[]="Fernando","Pepe","Alejandro","Alfredo","Eufrasio";


 System.out.println("Ingrese el numero de filas: ");
 int filas = sc.nextInt();

 System.out.println("Ingrese el numero de columnas: ");
 int columnas = sc.nextInt();

 String cadenas[][] = new String [filas][columnas];

 for (int i = 0; i < cadenas.length; i++) 
 for (int j = 0; j < cadenas[0].length; j++) 
 System.out.println("Ingrese un nombre para la casilla [" + i + "][" + j + "]");
 cadenas[i][j] = sc.next();
 
 

 Arrays.sort(cadenas);

 //Mostramos el array ya ordenado
 for (String i[] : cadenas) 
 for(String k: i)
 System.out.println(i);
 
 
 

Error

Ingrese el numero de filas: 
2
Ingrese el numero de columnas: 
2
Ingrese un nombre para la casilla [0][0]
pedro
Ingrese un nombre para la casilla [0][1]
jesus
Ingrese un nombre para la casilla [1][0]
alfonso
Ingrese un nombre para la casilla [1][1]
carlos
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.String; 
cannot be cast to java.lang.Comparable
at
java.util.ComparableTimSort.countRunAndMakeAscending
(ComparableTimSort.java:32 )

at java.util.ComparableTimSort.sort(ComparableTimSort.java:188)
at java.util.Arrays.sort(Arrays.java:1246)
at NombresPersonas.main(NombresPersonas.java:29)
C:UsersJosé PadrónAppDataLocalNetBeansCache8.2executor- 
snippetsrun.xml:53: Java returned: 1
BUILD FAILED (total time: 8 seconds)

What am I doing wrong?

PS: I just made an improvement to the code but it just orders me the names by rows

import java.util.Arrays;
import java.util.Scanner;

public class NombresPersonas 

public static void main(String[] args) 

 Scanner sc = new Scanner(System.in);

 //array a ordenar
 //String cadenas[]="Fernando","Pepe","Alejandro","Alfredo","Eufrasio";


 System.out.println("Ingrese el numero de filas: ");
 int filas = sc.nextInt();

 System.out.println("Ingrese el numero de columnas: ");
 int columnas = sc.nextInt();

 String cadenas[][] = new String [filas][columnas];

 for (int i = 0; i < cadenas.length; i++) 
 for (int j = 0; j < cadenas[0].length; j++) 
 System.out.println("Ingrese un nombre para la casilla [" + i + "][" + j + "]");
 cadenas[i][j] = sc.next();
 
 

 System.out.println("Matriz original: ");
 imprimir(cadenas);

 for(String[] i: cadenas)
 Arrays.sort(i);
 

 System.out.println("Matriz ordenada alfábeticamente: ");
 imprimir(cadenas);

 

 public static void imprimir(String M[][]) 
 System.out.println(); 
 for (int i=0; i<M.length; i++) 
 for (int j=0; j<M[0].length; j++) 
 System.out.print(M[i][j]+" "); 
 System.out.println(); 
 
 System.out.println(); 
 

[ad_2]

لینک منبع