Nesne Tabanlı Programlama-2 (Bahar-2016) Hafta-5/2

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class combo extends JFrame implements ActionListener {

	JComboBox jcb;
	public combo()
	{
		this.setTitle("ComboBox");
		this.setLayout(new FlowLayout());
		this.setSize(150,100);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		String[] icerik = {"Seçiniz","Deneme","XYZ","ABC"};
		jcb = new JComboBox(icerik);
		jcb.setPreferredSize(new Dimension(140, 30));
		
		JButton jbtn = new JButton("Göster");
		jbtn.setPreferredSize(new Dimension(120, 30));
		jbtn.addActionListener(this);		
		
		this.add(jcb);
		this.add(jbtn);
		
		this.setVisible(true);
	}
	
	@Override
	public void actionPerformed(ActionEvent arg0) {
		
		if(jcb.getSelectedIndex()>0)
		{
			//int index = jcb.getSelectedIndex();
			//String secilenbilgi = jcb.getItemAt(index)+"";	
			
			JOptionPane.showMessageDialog(this, jcb.getSelectedItem());
			
			jcb.setSelectedIndex(0);
		}
		
		

	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new combo();

	}

}

 

 

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

import javax.swing.*;

public class combo1 extends JFrame implements ActionListener, ItemListener {

	JComboBox jcb;

	//Vector<String> v;
	JTextField jtf;
	public combo1()
	{
		this.setTitle("ComboBox 2");
		this.setLayout(new FlowLayout());
		this.setSize(150,150);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	
		/*v = new Vector<String>();
		v.add("Deneme");
		v.add("abc");
		v.add("xyz");*/
		
		//jcb = new JComboBox(v);
		jcb = new JComboBox();
		jcb.addItem("Seçiniz");
		
		jcb.setPreferredSize(new Dimension(140, 30));	
		//jcb.addItemListener(this);
		
		
		jtf = new JTextField();
		jtf.setPreferredSize(new Dimension(140, 30));
		
		JButton jbtn1 = new JButton("Ekle");
		jbtn1.setPreferredSize(new Dimension(140, 30));
		jbtn1.addActionListener(this);	
		jbtn1.setActionCommand("ekle");
		
		JButton jbtn2 = new JButton("Sil");
		jbtn2.setPreferredSize(new Dimension(140, 30));
		jbtn2.addActionListener(this);
		jbtn2.setActionCommand("sil");
	
		this.add(jcb);
		this.add(jtf);
		this.add(jbtn1);
		this.add(jbtn2);
		
		this.setVisible(true);
	}
	
	@Override
	public void actionPerformed(ActionEvent arg0) {
		
		switch(arg0.getActionCommand())
		{
			case "ekle": ekle(); break;
			case "sil": sil(); break;
		}
		
		
	}
	
	@Override
	public void itemStateChanged(ItemEvent e) {
		
	//	JOptionPane.showMessageDialog(this, jcb.getSelectedItem());
		
	}
	
	public void ekle()
	{
		if(jtf.getText().length()>0)
		{
			jcb.addItem(jtf.getText());
			jtf.setText("");
		}
		
		
	}
	
	public void sil()
	{
		int secilen = jcb.getSelectedIndex();
		if(secilen>0){
			jcb.removeItemAt(secilen);
			jcb.setSelectedIndex(0);
		}
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new combo1();

	}



}