How to get Total Columns Returned by Query

 ResultSet rs = stmt.executeQuery(strSQL);
 ResultSetMetaData rsmd = rs.getMetaData();
 int columnsNumber = rsmd.getColumnCount();

How to get Column Name from Query

 ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
 ResultSetMetaData rsmd = rs.getMetaData();
 String name = rsmd.getColumnName(1);

How to get Column Count from Query and Loop Through That

ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();

// The column count starts from 1
for (int i = 1; i < columnCount + 1; i++ ) {
  String name = rsmd.getColumnName(i);
  // Do stuff with name
}

To Find a Column with particular Name

 ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
 rs.getString(rs.findColumn("fullname"));

How to get List of Column Names from Query and Store it in a Array

 ResultSetMetaData meta = resultset.getMetaData();  
 Integer columncount = meta.getColumnCount();
 int count = 1 ; 
 String[] columnNames = null;

 while(columncount <=count)
  columnNames [i] = meta.getColumnName(i);

 System.out.println (columnNames.size());