Implement autocomplete in Java – did I do it right?

See English answers > create a autocompleting textbox in java with a dropdown list5

>Start > enter city name – partial or complete > if the user clicks enter, get the text from jtextfield > start search. > If matches are found, put them in vector and JList > if no match is found, add a string "no match found" > show jwindow to the user containing the results > stop

Code:

package test;
import javax.swing.*;

import java.awt.Dimension;
import java.awt.event.*;
import java.util.Vector;

public class AutoCompleteTest extends JFrame{
    JTextField city = new JTextField(10);
    String enteredName = null;
    String[] cities = {"new jersey","new hampshire","sussex","essex","london","delhi","new york"};
    JList list = new JList();
    JScrollPane pane = new JScrollPane();
    ResultWindow r = new ResultWindow();
//------------------------------------------------------------------------------
    public static void main(String[] args) {
        new AutoCompletetest();
    }
//------------------------------------------------------------------------------
    public AutoCompletetest(){
        setLayout(new java.awt.FlowLayout());
        setVisible(true);
        add(city);
//      add(pane);
        pack();
        setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        city.addKeyListener(new TextHandler());
    }
//------------------------------------------------------------------------------
    public void initiateSearch(String lookFor){
        Vector<String> matches = new Vector<>();
        lookFor = lookFor.toLowerCase();
        for(String each : cities){
            if(each.contains(lookFor)){
                matches.add(each);
                System.out.println("Match: " + each);
            }
        }
        this.repaint();

        if(matches.size()!=0){
            list.setListData(matches);
            r.searchResult = list;
            r.pane = pane;
            r.initiateDisplay();
        }else{
            matches.add("No Match Found");
            list.setListData(matches);
            r.searchResult = list;
            r.pane = pane;
            r.initiateDisplay();
        }

    }
//------------------------------------------------------------------------------
    public class ResultWindow extends JWindow{
        public JScrollPane pane;
        public JList searchResult;
//------------------------------------------------------------------------------
        public ResultWindow(){

        }
//------------------------------------------------------------------------------
        public void initiateDisplay(){
            pane.setViewportView(searchResult);
            add(pane);
            pack();
            this.setLocation(AutoCompleteTest.this.getX() + 2,AutoCompleteTest.this.getY()+
                    AutoCompleteTest.this.getHeight());

//          this.setPreferredSize(city.getPreferredSize());
            this.setVisible(true);
        }
    }
//------------------------------------------------------------------------------

    class TextHandler implements KeyListener{
        @Override
        public void keyTyped(KeyEvent e){

        }

        @Override
        public void keyPressed(KeyEvent e){
            if(r.isVisible()){
                r.setVisible(false);
            }
            if(e.getKeyChar() == '\n'){
                initiateSearch(city.getText());
            }
        }

        @Override
        public void keyReleased(KeyEvent e){

        }
    }
//------------------------------------------------------------------------------
}

yield

problem

The size of the jwindow that displays the result (JList in JScrollPane) varies according to the result – if the city name is small, the jwindow is small, if the city name is large, the jwindow is large

I have tried all possible combinations I try to use setpreferreddimension () of jwindow, JList and JScrollPane, but the problem will not disappear I want it to match the size of the decorated JFrame, whatever

Solution

>JList or JCombo@R_644_2419 @If the appropriate preferredSize is not returned, this value must be set to use JList for jwindow Setprototypecellvalue() (must be packaged after any changes) and / or use JList Setvisiblerowcount(), and then return getpreferredscrollableviewportsize() for JList in JScrollPane

edit

>This idea may be easy. You can put JTable to the jwindow > in a column, > no jtableheader > add rowsorter (see the code example in the tutorial) > and then complete each step: -), There is no other need to be there (maybe change the background of jtextfield, and add a setvisible pop-up window from documentlistener (be sure to test! Isvisible) when there is no match returned by rowfilter)