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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 Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		Matrix<Float> m = new Matrix(2, 2);
  13. 		m.set(0, 0, Float.MAX_VALUE);
  14. 		m.set(0, 1, 42.0f);
  15. 		m.set(1, 0, null);
  16. 		m.set(1, 1, 1f);
  17. 		printMatrix(m);
  18. 	}
  19.  
  20. 	private static void printMatrix(Matrix<?> m) {
  21. 		for (int row = 0; row < m.rows; row++) {
  22. 			for (int col = 0; col < m.cols; col++) {
  23. 				System.out.println(m.get(row, col));
  24. 			}
  25. 		}
  26. 	}
  27.  
  28. 	public static class Matrix<T> {
  29.  
  30. 		private final Vector<Vector<T>> data;
  31. 		public final int rows, cols;
  32.  
  33. 		public Matrix(int rows, int cols) {
  34. 			this.rows = rows;
  35. 			this.cols = cols;
  36. 			data = new Vector<>();
  37. 			data.setSize(rows);
  38. 			for (int i = 0; i < rows; i++) {
  39. 				Vector<T> col = new Vector<T>();
  40. 				col.setSize(cols);
  41. 				data.set(i, col);
  42. 			}
  43. 		}
  44.  
  45. 		public T get(int row, int col) {
  46. 			return data.get(row).get(col);
  47. 		}
  48.  
  49. 		public void set(int row, int col, T val) {
  50. 			data.get(row).set(col, val);
  51. 		}
  52. 	}
  53. }
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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3.4028235E38
42.0
null
1.0
https://ideone.com/E0x4dq
language:
Java (12.0.1)
created:
9 years ago
visibility:
public

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