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copied!<p>I read your <a href="https://stackoverflow.com/questions/8637815/naming-conventions-in-java">other post</a> and got the impression you are a new java developer, so I found the need to give a running example. Simply copy paste this to your IDE and run it. It should run and produce an output which is a proof of concept for you. </p> <p>The input I am using here is </p> <pre><code>String[] input = new String[]{ "1,2,1" , "1,1,2", "1,2,3", "1,3,1", "1,1,1", "1,3,3", "1,1,3"}; </code></pre> <p>And as you can see it has repetitions as you described. The output is </p> <pre><code> The triangle [Triangle{sides=[1, 1, 2]}] already exists! The triangle [Triangle{sides=[1, 1, 3]}] already exists! triangles = [Triangle{sides=[1, 2, 3]}, Triangle{sides=[1, 1, 3]}, Triangle{sides=[1, 1, 2]}, Triangle{sides=[1, 1, 1]}, Triangle{sides=[1, 3, 3]}] </code></pre> <p>As you requested the output is with no repetition. </p> <pre><code>import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.Arrays; import java.util.HashSet; import java.util.Set; public class Triangle { private int[]sides; public Triangle( int x, int y, int z) { sides = new int[]{x,y,z}; Arrays.sort( sides ); } public Triangle( String ... args ) { this( Integer.parseInt( args[0].trim() ), Integer.parseInt( args[1].trim() ), Integer.parseInt( args[2].trim() )); } @Override public boolean equals( Object o ) { if ( this == o ) return true; if ( o == null || getClass() != o.getClass() ) return false; Triangle triangle = ( Triangle ) o; if ( !Arrays.equals( sides, triangle.sides ) ) return false; return true; } @Override public int hashCode() { return sides != null ? Arrays.hashCode( sides ) : 0; } @Override public String toString() { return "Triangle{" + "sides=" + Arrays.toString( sides ) + '}'; } public static void main( String[] args ) throws IOException { String[] input = new String[]{ "1,2,1" , "1,1,2", "1,2,3","1,3,1","1,1,1","1,3,3","1,1,3"}; Set<Triangle> triangles = new HashSet<Triangle>( ); for ( String s : input ) { Triangle triangle = new Triangle( s.split( "," ) ); if ( triangles.contains( triangle )) { System.out.println("The triangle [" + triangle + "] already exists!"); } triangles.add( triangle ); } System.out.println( "triangles = " + triangles ); } } </code></pre>

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