java - JTable add rows bottom up - rows added one after the other should appear at the bottom of the last one but all should be bottom aligned -

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i have jtable in java swing needs bottom aligned.

as in normal tables when row added table placed on top, when next row added added under , on.

what place new row @ bottom of table. when new row added new row placed right @ bottom , previous row move up. way rows appear move upward. rows should stick bottom.

any ideas how this?

you can use decorator pattern. assuming class named tablemodeldecorator decorates tablemodel can implement:

public class tableemptyreverserowsmodel extends tablemodeldecorator {  private int minimumrows;  public tableemptyreverserowsmodel(final tablemodel realmodel,                              final int minimumrows) {     super(realmodel);      this.minimumrows = minimumrows; }  public int getrowcount() {     int realcount = model.getrowcount();             return realcount < minimumrows ? minimumrows : realcount; }   public boolean iscelleditable(int rowindex, int columnindex) {     int diff = minimumrows - model.getrowcount();      if (diff > 0) {         if (rowindex < diff) {             return false;         } else {             return model.iscelleditable(rowindex - diff, columnindex);         }     } else {         return model.iscelleditable(rowindex, columnindex);     } }  public object getvalueat(int rowindex, int columnindex) {     int diff = minimumrows - model.getrowcount();      if (diff > 0) {         if (rowindex < diff) {             return null;         } else {             return model.getvalueat(rowindex - diff, columnindex);         }     } else {         return model.getvalueat(rowindex, columnindex);     } }  public void setvalueat(object avalue, int rowindex, int columnindex) {     int diff = minimumrows - model.getrowcount();      if (diff > 0) {         if (rowindex < diff) {          } else {             super.setvalueat(avalue, rowindex - diff, columnindex);         }     } else {         super.setvalueat(avalue, rowindex, columnindex);     } }  }

be aware of cell renderer must handle null value ;)

see ya!


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