Vetores Multidimensionais em Java

Bidimensional.java

package org.example;

public class Bidimensional {
  public static void main(String[] args) {

    String[][] matrix;
    //    int[][] numberMatrix = {
    //      {1, 2, 3}, // i==0
    //      {4, 5, 6}, // i==1
    //      {7, 8, 9} // i==2
    //    };
    int[][] numberMatrix = new int[3][3];
    int values = 0;

    for (int i = 0; i < numberMatrix.length; i++) {
      for (int j = 0; j < numberMatrix[i].length; j++) {
        numberMatrix[i][j] = ++values;
      }
    }

    for (int i = 0; i < numberMatrix.length; i++) {
      for (int j = 0; j < numberMatrix[i].length; j++) {
        System.out.println(numberMatrix[i][j]);
      }
    }

    //    matrix = new String[3][2];
    matrix =
        new String[][] {
          // j==0   j==1    j==2
          {"lili", "08111", "Sol"}, // i==0
          {"lala", "08122", "Lua"}, // i==1
          {"maya", "008133", "Estrela"} // i==2
        };

    System.out.println("\nSomente o lala (linha 1, coluna 0): " + matrix[1][0]);
    System.out.println("Somente a linha 1: " + matrix[1][0] + " " + matrix[1][1]);

    System.out.println("Linha e Coluna");
    for (int i = 0; i < matrix.length; i++) {
      for (int j = 0; j < matrix[i].length; j++) {
        System.out.println(matrix[i][j]);
      }
    }

    System.out.println("\nLinha a linha:");
    for (int i = 0; i < matrix.length; i++) {
      System.out.println();
      for (int j = 0; j < matrix[i].length; j++) {
        System.out.print(matrix[i][j]);

        if (j < matrix[i].length - 1) System.out.print("_");
      }
    }

    /*Programa assume que cada linha do vetor multidimensional (matriz) contém a mesma
    quantidade de colunas*/
    System.out.println("\n\nCada coluna por vez:\n");
    int line = 0;
    int column = 0;

    while (column < matrix[line].length) {
      System.out.printf("Coluna %d:\n", column);
      for (; line < matrix.length; line++) System.out.println(matrix[line][column]);

      line = 0;
      column++;
      System.out.println();
    }
  }
}