listed.java

简单的java入门编程

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

public class Listed extends JFrame
    implements ActionListener{
	
	private JButton button;
	private ArrayList list;
	private JTextField atextField;
	int numberOfItem=list.size();
	
	public static void  main(String[] args){
		Listed frame=new Listed();
		frame.setSize(300,200);
		frame.createGUI();
		frame.show();
		
		
	}
private void createGUI(){
	setDefaultCloseOperation(EXIT_ON_CLOSE);
	Container window=getContentPane();
	window.setLayout(new FlowLayout());
	
    atextField=new TextField(10);
    window.add(textField);
    
    button=new JButton("add an item");
    button.addActionListener(this);
    window.add(button);
    
    
    
    list=new ArrayList();
	window.add(list);
    	
   }
   private void addAnItem(ArrayList list){
   	list.add(textField.getText());
   	
   }
   public void displayLength(ArrayList list){
   	JOptionPane.showMessageDialog(null,Integer.toString(list.size()));
   }
   private void display(ArrayList list){
   	String newLine="\n";
   	textArea.setText("");
   	for(int index=0;index<list.size();index++){
   		textArea.append(list.get(index)+newLine);
   	}
   }
   public void actionPerformed(ActionEvent event){
   	   	
   	textField.setText();
   	
   }
   	
   	
}