java模拟栈的编写

这是一个java模拟栈的编写

package net.etwo.cec.stack;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;


/**
 * 
 * @author etwo
 *
 */
public class ImitateStack {

	private JFrame jfMain;// 主窗体
	private JPanel jpMain;// 面板
	private JLabel jlShowStack, jlOneNum, jlOutStackState, jlState;
	private JTextField jtfShowStack, jtfOneNum, jtfOutStackState;
	private JButton jbtnOutStack, jbtnInStack, jbtnClearStack;

	public ImitateStack() {
		jfMain = new JFrame("栈模拟器");
		jpMain = new JPanel();

		jlState = new JLabel("栈模拟器！");

		jlShowStack = new JLabel("栈显示情况：");
		jlOneNum = new JLabel("请输入一个整数：");
		jlOutStackState = new JLabel("出栈情况：");

		jtfShowStack = new JTextField(50);
		jtfOneNum = new JTextField(30);
		jtfOutStackState = new JTextField(30);

		jbtnOutStack = new JButton("出     栈");
		jbtnInStack = new JButton("进     栈");
		jbtnClearStack = new JButton("清空栈");

		jpMain.setLayout(null);

		jlState.setBounds(220, 20, 200, 20);

		jlShowStack.setBounds(29, 60, 100, 20);
		jtfShowStack.setBounds(133, 60, 250, 20);
		jbtnOutStack.setBounds(400, 60, 75, 20);

		jlOneNum.setBounds(3, 100, 150, 20);
		jtfOneNum.setBounds(133, 100, 250, 20);
		jbtnInStack.setBounds(400, 100, 75, 20);

		jlOutStackState.setBounds(42, 140, 150, 20);
		jtfOutStackState.setBounds(133, 140, 250, 20);
		jbtnClearStack.setBounds(400, 140, 75, 20);

		jpMain.add(jlState);

		jpMain.add(jlShowStack);
		jpMain.add(jtfShowStack);
		jpMain.add(jbtnOutStack);

		jpMain.add(jlOneNum);
		jpMain.add(jtfOneNum);
		jpMain.add(jbtnInStack);

		jpMain.add(jlOutStackState);
		jpMain.add(jtfOutStackState);
		jpMain.add(jbtnClearStack);

		jfMain.add(jpMain);

		jfMain.setSize(566, 370);
		jfMain.setLocationRelativeTo(null);
		jfMain.setVisible(true);
		jfMain.setDefaultCloseOperation(jfMain.EXIT_ON_CLOSE);

		// 设置栈本身不可编辑
		jtfShowStack.setEnabled(false);

		// 进栈
		jbtnInStack.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				actionMain(jtfOneNum, jbtnInStack);
			}
		});

		// 栈清空
		jbtnClearStack.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				String strStack = jtfShowStack.getText();
				if ("".equals(strStack)) {
					JOptionPane.showMessageDialog(jfMain, "栈已为空！");
				} else {
					jtfShowStack.setText("");
				}
			}
		});

		// 出栈
		jbtnOutStack.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				String str = jtfShowStack.getText().trim();
				if ("".equals(str)) {
					JOptionPane.showMessageDialog(jfMain, "栈已经为空");
				} else {
					String[] strBuf = str.split(" ");
					for (int i = strBuf.length - 1; i >= 0; i--) {
						jtfOutStackState.setText(strBuf[0]);
						jtfShowStack.setText(str.substring(strBuf.length - i));
						break;
					}
				}
			}
		});
	}

	public void actionMain(JTextField jtfNum, JButton jbtnStack) {
		String numStack = jtfNum.getText().trim();
		if ("".equals(numStack)) {
			JOptionPane.showMessageDialog(jfMain, "不能为空");
		} else {
			try {
				Integer intStack = Integer.parseInt(numStack);
				jtfShowStack.setText(numStack + " " + jtfShowStack.getText());
				jtfNum.setText("");
				// jbtnStack.setEnabled(false);
			} catch (Exception e2) {
				// TODO: handle exception
				JOptionPane.showMessageDialog(jfMain, "请输入整数");
			}
		}
	}

	public static void main(String[] args) {
		new ImitateStack();
	}
}