Initializing a string with elements of an int array

Question

I'm trying to create a toString method that would return a string representation of my object "Individual". Individual is an array of integers. The string should contain an introduction to my permutation, and both the indexes and elements of the array.

So ideally the string should look like this

  public String toString() {
    System.out.println ("The permutation of this Individual is the following: ");
    for (int i=0; i<size; i++){
      System.out.print (" " + i);
    }
    System.out.println();
    for (int i=0; i<size; i++) {
      System.out.print (" " + individual[i]);
    }
    System.out.println ("Where the top row indicates column of queen, and bottom indicates row of queen");
  }

I'm stuck on how to store and format this particular representation as a String, especially on how to store the array elements into the string.

So you need a string of indexes and and a string of int values below it and the problem is to align them? — Andrei Nikolaenko
– Andrei Nikolaenko, Commented Feb 8, 2015 at 17:58

Pham Trung · Accepted Answer · 2015-02-08 17:58:37Z

3

You need a StringBuilder instead of printing it out

 public String toString() {
    StringBuilder builder =new StringBuilder();
    builder.append("The permutation of this Individual is the following: ");
    builder.append("\n");//This to end a line
    for (int i=0; i<size; i++){
       builder.append(" " + i);
    }
    builder.append("\n");
    for (int i=0; i<size; i++) {
       builder.append(" " + individual[i]);
    }
    builder.append("\n");
    builder.append("Where the top row indicates column of queen, and bottom indicates row of queen");
    builder.append("\n");
    return builder.toString();
  }

answered Feb 8, 2015 at 17:58

Pham Trung

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1 Comment

Pshemo Over a year ago

Generally we let user decide if he wants to print some value with line separator after it or not. In other words result of toString shouldn't add \n at end of its result, so consider removing builder.append("\n"); placed right before return statement.

Ace · Accepted Answer · 2015-02-08 18:01:32Z

0

You can store array elements into string like this if you meant this:

String data = ""; // empty
ArrayList items; // array of stuff you want to store into a string

for(int i =0; i< items.size(); i++){
  data+=""+items.get(i) + ","; // appends into a string
} 

// finally return the string, you can put this in a function
return data;

answered Feb 8, 2015 at 18:01

Ace

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