Question

How to convert a specific column of a decimal matrix to a string in Java

Answer 1

import java.io.StringWriter;
 
public class ColumnToStringConverter {
    public static String convertColumnToString(int[][] matrix, int col) {
        int rows = matrix.length;
        
        StringBuilder str = new StringBuilder();
        StringWriter sw = new StringWriter();
 
        for (int i = 0; i < rows; i++) {
            sw.write(String.valueOf(matrix[i][col]));
            str.append(sw.toString()).append(" ");
            sw.getBuffer().setLength(0);
        }
 
        return str.toString().trim();
    }
 
    public static void main(String[] args) {
        int[][] matrix = {
                { 4,  7,  9, 18, 29, 0},
                { 1,  9, 18, 99,  4, 3},
                { 9, 17, 89,  2,  7, 5},
                {19, 49,  6,  1,  9, 8},
                {29,  4,  7,  9, 18, 6}
        };
 
        int col = 3;
 
        String str = convertColumnToString(matrix, col);
         
        System.out.println(str);
    }
}
 
  
  
/*
run:
  
18 99 2 1 9
  
*/

 

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Answer 2

import java.io.StringWriter;
  
public class ColumnToStringConverter {
    public static String convertColumnToString(int[][] matrix, int col) {
        int rows = matrix.length;
        StringWriter sw = new StringWriter();
  
        for (int i = 0; i < rows; i++) {
            sw.write(String.valueOf(matrix[i][col]));
            sw.write(" ");
        }
  
        return sw.toString().trim();
    }
 
    public static void main(String[] args) {
        int[][] matrix = {
                { 4,  7,  9, 18, 29, 0},
                { 1,  9, 18, 99,  4, 3},
                { 9, 17, 89,  2,  7, 5},
                {19, 49,  6,  1,  9, 8},
                {29,  4,  7,  9, 18, 6}
        };
  
        int col = 3;
  
        String str = convertColumnToString(matrix, col);
          
        System.out.println(str);
    }
}
  
   
   
/*
run:
   
18 99 2 1 9
   
*/

 

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