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public boolean DoesitExistinTable(JTable table, String string, String message) {
        boolean exists = false;
        ArrayList<String> contentList = new ArrayList();
        int row = table.getRowCount();
        int column = table.getColumnCount();
        
        for (int i=0; i < jTable1.getRowCount(); i++) { //rows
                for (int j=0; j < jTable1.getColumnCount(); j++) { //columns
                        if (table.getValueAt(i,j)!=null) {
                             String check = table.getValueAt(i, j).toString().trim(); 
                             if (!contentList.contains(string)) {               
                                     contentList.add(check);
                                     continue;
                                    }
                             if (contentList.contains(string)){
                                     exists = true;
                                     JOptionPane.showMessageDialog(null, message,"message",JOptionPane.PLAIN_MESSAGE);
                                     break; 
                            } 
                } else if (table.getValueAt(i,j) == null) {
                    continue;
                }
          } 
    }
        return exists;
}