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POcompare two arrayList and stock the result in a thirth arrayList
 

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  1. POcompare two arrayList and stock the result in a thirth arrayList
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    <p>i want compare 2 arrayList when i stock in them the result of a class java of telnet this class it's to telnet about a router and gives all of interfaces of this routers then stock them in the arrayList so i stock the interfaces for the router1 in myData1 and the second in myData2 and i will compare if the interface of the first aray it's the same in the second just add one of them in the array of result myData but it gives me anthing the code</p> <pre><code>public class Test { public static void main(String[] args) { Connection conn = null; try { conn = DriverManager.getConnection("jdbc:mysql://localhost/mohammedia", "root", "123456"); String sql = "SELECT * FROM router;"; Telnet_Interface telnet = new Telnet_Interface(); Telnet_Interface telnet1 = new Telnet_Interface(); Telnet_Interface telnet2 = new Telnet_Interface(); PreparedStatement prest = conn.prepareStatement(sql); ResultSet res=prest.executeQuery(); while(res.next()){ telnet1.Config(res.getString(1), "user", "passwd", res.getString(1)); telnet2.Config(res.getString(2), "user", "passwd", res.getString(2)); } ArrayList myData=new ArrayList(); ArrayList myData1=telnet1.getMyData(); ArrayList myData2=telnet2.getMyData(); boolean bool=false; for(int i=0;i&lt;myData1.size();i++) { for(int j=0;j&lt;myData2.size();j++) { if (myData2.get(j).equals(myData1.get(i))) { bool=true; //System.out.print("sdfsd"); } if(!bool) { myData.add(myData2.get(j)); //System.out.print("sdsd"); } } } for(int x=0;x&lt;myData.size();x++) { System.out.print(myData.get(x)); } } catch (SQLException ex) { Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex); } } } </code></pre> <p>what's the problem ?? thank you</p>
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    1. UScisco.nat
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      1. VTUpMod
    1. COYou use `.equals()`; does your `TelnetInterface` implement `.equals()` and `.hashCode()` correctly?
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      1. USfge
    2. CODo you want to keep all the distinct elements of both List in a separate List ?
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      1. USNINCOMPOOP
    3. COIf `Telnet_Interface` is user defined class then override the `equals` method in that class ..
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      1. USVishal K
 

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