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copied!<p>I don't know if this will help you.But it works in both the directions as you say</p> <pre><code>import java.util.HashSet; public class Flows implements Comparable<Flows> { String srcAddr = "", dstAddr = "", protocol = ""; int srcPort = 0, dstPort = 0; public Flows(String sIP, String dIP, int sPort, int dPort){ this.srcAddr = sIP; this.dstAddr = dIP; this.srcPort = sPort; this.dstPort = dPort; //this.protocol = protocol; } public Flows(){ } public int compareTo(Flows other) { if(this.equals(other)){ return 0; }else return 1; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((dstAddr == null) ? 0 : dstAddr.hashCode())+((srcAddr == null) ? 0 : srcAddr.hashCode()); result = prime * result + dstPort+srcPort; return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if(obj instanceof Flows) { Flows c=(Flows)obj; if(srcAddr.equals(c.dstAddr) && dstAddr.equals(c.srcAddr) &&srcPort==c.dstPort && dstPort==c.srcPort) return true; if(srcAddr.equals(c.srcAddr) && dstAddr.equals(c.dstAddr) && srcPort==c.srcPort && dstPort==c.dstPort) return true; } return false; } @Override public String toString() { return String.format("[%s, %s, %s, %s, %s]", srcAddr, dstAddr, srcPort, dstPort, protocol); } public static void main(String[] args) { Flows f1=new Flows("192.168.1.65","217.174.16.1", 123456,80); Flows f2=new Flows("217.174.16.1","192.168.1.65",80,123456); Flows f3=new Flows("192.168.1.66","217.174.16.1", 123456,80); Flows f4=new Flows("217.174.16.1","192.168.1.66",80, 123456); System.out.println(f1.hashCode()+ " "+f2.hashCode()); HashSet<Flows> hh=new HashSet<Flows>(); hh.add(f1); hh.add(f2); hh.add(f3); hh.add(f4); System.out.println(f1.compareTo(f2)); System.out.println(hh); } } </code></pre> <p>I have used hashset to test.So it should work fine for hashmap too.</p>

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