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POJava N-Tuple implementation
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  1. POJava N-Tuple implementation
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    copied!<p>I just made a Java n-tuple which is type-safe.<br> I'm using some unconventional methods to achieve type-safety (I just made it for fun).</p> <p>Can someone can give some input on improving it or some possible flaws.</p> <pre><code>public class Tuple { private Object[] arr; private int size; private static boolean TypeLock = false; private static Object[] lastTuple = {1,1,1}; //default tuple type private Tuple(Object ... c) { // TODO Auto-generated constructor stub size=c.length; arr=c; if(TypeLock) { if(c.length == lastTuple.length) for(int i = 0; i&lt;c.length; i++) { if(c[i].getClass() == lastTuple[i].getClass()) continue; else throw new RuntimeException("Type Locked"); } else throw new RuntimeException("Type Locked"); } lastTuple = this.arr; } public static void setTypeLock(boolean typeLock) { TypeLock = typeLock; } @Override public boolean equals(Object obj) { // TODO Auto-generated method stub if (this == obj) return true; Tuple p = (Tuple)obj; for (int i = 0; i &lt; size; i++) { if (p.arr[i].getClass() == this.arr[i].getClass()) { if (!this.arr[i].equals(p.arr[i])) return false; } else return false; } return true; } @Override public int hashCode() { // TODO Auto-generated method stub int res = 17; for(int i = 0; i &lt; size; i++) res = res*37+arr[i].hashCode(); return res; } @Override public String toString() { // TODO Auto-generated method stub return Arrays.toString(arr); } public static void main(String[] args) { HashMap&lt;Tuple,String&gt; birthDay = new HashMap&lt;Tuple,String&gt;(); Tuple p = new Tuple(1,2,1986); Tuple.setTypeLock(true); Tuple p2 = new Tuple(2,10,2009); Tuple p3 = new Tuple(1,2,2010); Tuple p4 = new Tuple(1,2,2010); birthDay.put(p,"Kevin"); birthDay.put(p2,"Smith"); birthDay.put(p3,"Sam"); birthDay.put(p4, "Jack"); System.out.println(birthDay); System.out.println(birthDay.get(new Tuple(1,2,1986))); birthDay.put(new Tuple(1,2,""),""); } } </code></pre>
 

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