compare string from java and sql

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Why I still get an output "No" even though a is equal to k?

Java

public void CompareType(String a ) throws Exception {
		// TODO Auto-generated method stub
		String k;
		String sql="Select Type from menu ";
		DatabaseConnection db = new DatabaseConnection();
		Connection  conn =db.getConnection();
		PreparedStatement  ps = conn.prepareStatement(sql);
		ResultSet rs = ps.executeQuery();
		while (rs.next()) 
        {
			k=rs.getString("Type");
		if(a==k)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
        }
        }
		ps.close();
		rs.close();
		conn.close();
	}

Posted 22-Aug-15 1:50am

wseng

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CPallini · Accepted Answer · 2015-08-22T03:33:00

That is a well-know Java ~~weirdness~~ 'feature', try, for instance

Java

public class Str
{
  public static void main(String args[])
  {
    String a = "foo";
    String b = "fo";

    b += "o";

    if ( a == b)
    {
      System.out.println("the strings are ==");
    }
    if ( a.equals(b))
    {
      System.out.println("the strings are equal(s)");
    }
  }
}

If you want (you usually want) to compare the content of the two strings then use the equal method.