How to make a JTable non-editable

You can override the method isCellEditable and implement as you want
for example:

//instance table model
DefaultTableModel tableModel = new DefaultTableModel() {

    @Override
    public boolean isCellEditable(int row, int column) {
       //all cells false
       return false;
    }
};

table.setModel(tableModel);

or

//instance table model
DefaultTableModel tableModel = new DefaultTableModel() {

   @Override
   public boolean isCellEditable(int row, int column) {
       //Only the third column
       return column == 3;
   }
};

table.setModel(tableModel);

Note for if your JTable disappears

If your JTable is disappearing when you use this it is most likely because you need to use the DefaultTableModel(Object[][] data, Object[] columnNames) constructor instead.

//instance table model
DefaultTableModel tableModel = new DefaultTableModel(data, columnNames) {

    @Override
    public boolean isCellEditable(int row, int column) {
       //all cells false
       return false;
    }
};

table.setModel(tableModel);