Jcombobox not shown up

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just wondering, why my jcombo box at box 2 not shown up ?
im new in java

What I have tried:

import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import javax.swing.*;

public class CronJob extends JFrame {

    CronJob(String title) {
        super(title);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//********** minute **********************************        
        Vector minute = new Vector();
        minute.add(0, "0");
        minute.add(1, "1");
        minute.add(2, "2");
        minute.add(3, "3");
        minute.add(4, "4");
        minute.add(5, "5");

//********** Hour **********************************  
        Vector hour = new Vector();
        hour.add(0, "0");
        hour.add(1, "1");
        hour.add(2, "2");
        hour.add(3, "3");
        hour.add(4, "4");
        hour.add(5, "5");

        
    
        JComboBox jcb = new JComboBox(minute);
        getContentPane().add(jcb);
        
        JComboBox jcb2 = new JComboBox(hour);
        getContentPane().add(jcb2);
        
        setSize(40, 60);
        setVisible(true);

    }

    //*********** minute****************
    public static void main(String[] args) {
        new CronJob("Cron Job");
    }

}

Posted 12-Nov-17 16:24pm

Asyraf Patt

Updated 13-Nov-17 5:36am

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Comments

Richard MacCutchan 13-Nov-17 3:42am

I suspect there is some other method that you need to call to align the combo boxes properly in the frame. Check the swing documentation.

2 solutions

Solution 2

See Trail: Creating a GUI With JFC/Swing: Table of Contents (The Java™ Tutorials)[^].

Posted 13-Nov-17 5:36am

Richard MacCutchan

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ThilinaMD · Accepted Answer · 2017-11-13T04:15:00

Try following code.

JComboBox jcb = new JComboBox(minute);
     //set size and position
     jcb.setSize(100, 20);
     jcb.setLocation(10, 10);

     JComboBox jcb2 = new JComboBox(hour);
     jcb2.setSize(100, 20);
     jcb2.setLocation(120, 10);

     getContentPane().add(jcb);
     getContentPane().add(jcb2);