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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) {
  11. 		DocumentRow row = new DocumentRow();
  12. 		row.setValue(Column.TEXT_VALUE, new DocumentCell<>("asdf"));
  13. 		row.setValue(Column.NUMERIC_VALUE, new DocumentCell<>(4));
  14. 		row.setValue(Column.DATE_VALUE, new DocumentCell<>(new Date()));
  15.  
  16. 		String s = row.getValue(Column.TEXT_VALUE);
  17. 		Number i = row.getValue(Column.NUMERIC_VALUE);
  18. 		Date d = row.getValue(Column.DATE_VALUE);
  19.  
  20. 		System.out.format("%s, %d, %s", s, i ,d);
  21. 	}
  22. }
  23.  
  24. class DocumentRow {
  25.  
  26.     private Map<Column<?>, DocumentCell<?>> rowContents = new HashMap<>();
  27.  
  28.     public <U> U getValue(Column<U> column) {
  29.     	@SuppressWarnings("unchecked")
  30. 		DocumentCell<U> doc = (DocumentCell<U>) rowContents.get(column);
  31.     	return doc.getValue(column);
  32.     }
  33.  
  34.  
  35.     public <U> void setValue(Column<U> column, DocumentCell<U> value) {
  36.         rowContents.put(column, value);
  37.     }
  38. }
  39.  
  40. class DocumentCell<T> {
  41.     private T value;
  42.  
  43.     public DocumentCell(T t){ this.value = t; }
  44.  
  45.     public T getValue(Column<T> c){
  46.     	return value;
  47.     }
  48. }
  49.  
  50. class Column<T> {
  51. 	public static final Column<String> TEXT_VALUE = new Column<>("Text_Column_Name", String.class);
  52. 	public static final Column<Number> NUMERIC_VALUE = new Column<>("Numeric_Column_Name", Number.class);
  53. 	public static final Column<Date> DATE_VALUE = new Column<>("Date_Column_Name", Date.class);
  54.  
  55.     String name;
  56.     Class<T> clazz;
  57.  
  58.     private Column(String name, Class<T> clazz){
  59.     	this.name = name;
  60.     	this.clazz = clazz;
  61.     }
  62. }
Success #stdin #stdout 0.07s 29748KB
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stdin 
Standard input is empty
stdout 
asdf, 4, Fri May 18 06:56:11 GMT 2018
https://ideone.com/wVrKZ2
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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