Getting error on printing array

Question

I got this code:

import java.util.*;
import java.io.*;

public class Oblig3A{
    public static void main(String[]args){
    OrdAnalyse O = new OrdAnalyse();
            


        

Answer 1

This is not an error... This is what the default toString() implementation of the Object class returns...

[Ljava.lang.String;@163de20

Means:

• array of references ( [L )
• of type String ( java.lang.String )
• unique object ID

Code of Object.toString()

public String toString() {
  return getClass().getName() + "@" + Integer.toHexString(hashCode());
}

What you shouldd do is to use a proper way to print:

• a loop

  StringBuilder sb = new StringBuilder();
  for(String s: myArray) {
      sb.append(s);
      if(sb.length()>0) {
         sb.append(',');
      }
  }
  System.println(s.toString());
  

• Arrays.toString

Answer 2

Actually this is commonly considered to be a "mistake" of arrays in Java: arrays don't override toString(), sadly. What you see is Object's toString():

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

getClass().getName() + '@' + Integer.toHexString(hashCode())

---

A common workaround is to use Arrays.toString():

System.out.println(Arrays.toString(oldArray));

Answer 3

Use Arrays.toString() to log your Array's contents

System.out.println(Arrays.toString(ordArray));

If you want a formatted output you need to iterate over it using a good old for loop.

for (int i = 0; i < ordArray.length; i++) {
   System.out.printf("ordArray[%d] = %s", i, ordArray[i]);
}

Answer 4

You have to print the array element by element.

ie.

    for(int i = 0; i < ordArray.length; i++)
        System.out.println(ordArray[i]);