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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Operations
  9. {
  10.  
  11.    public final int SET = 1;
  12.    int rows;
  13.    int cols;
  14.    int objects;
  15.    int times;
  16.    int doubles = 0;
  17.    int empty = 0;
  18.    // declare the array
  19.    private int[][] world;
  20.  
  21.    public Operations() {}
  22.  
  23.    public Operations(int rows, int cols, int objects, int times)
  24.    {
  25.       this.rows = rows;
  26.       this.cols = cols;
  27.       this.objects = objects;
  28.       this.times = times;
  29.       world = new int[rows][cols];
  30.    }
  31.  
  32.    public void setParameters(int rows, int cols, int objects, int times)
  33.    {
  34.       this.rows = rows;
  35.       this.cols = cols;
  36.       this.objects = objects;
  37.       this.times = times;
  38.       // initialize the array
  39.       world = new int[rows][cols];
  40.    }	
  41.  
  42.    public static void main (String[] args) throws java.lang.Exception
  43.    {
  44.    	    // empty constructor
  45. 		Operations ops = new Operations();
  46. 		// At this point world is null
  47. 		System.out.println("Empty constructor: " + Arrays.deepToString(ops.world));
  48. 		// initialize the array
  49. 		ops.setParameters(1, 1, 1, 1);
  50. 		// world has been initialized
  51. 		System.out.println("After setParameters: " + Arrays.deepToString(ops.world));
  52.  
  53. 		System.out.println("-------------------------------------------");
  54.  
  55. 		// full constructor
  56. 		Operations ops2 = new Operations(1, 1, 1, 1);
  57. 		// world has been initialized
  58. 		System.out.println("Full constructor: " + Arrays.deepToString(ops2.world));
  59. 		// reinitialize the array
  60. 		ops2.setParameters(2, 2, 2, 2);
  61. 		System.out.println("After setParameters: " + Arrays.deepToString(ops2.world));
  62.    }
  63. }
Success #stdin #stdout 0.07s 380160KB
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Standard input is empty
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Empty constructor: null
After setParameters: [[0]]
-------------------------------------------
Full constructor: [[0]]
After setParameters: [[0, 0], [0, 0]]
https://ideone.com/qhvK8c
http://stackoverflow.com/questions/19052849/set-values-array-within-a-method/19053007
language:
Java (12.0.1)
created:
10 years ago
visibility:
secret

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