Question

大一java程序设计问题！！！

1.输入两个整数，分别进行加、减、乘、除等算术运算，界面如下图所示。要求：1) 采用Swing组件设计图形用户界面，采用3个文本行JTextField分别表示两个操作数和运算结果，其中表示运算结果的文本行只能显示，不能输入；采用组合框JComboBox提供多种算数运算符的选择方式，组合框只能在下拉列表中选择，不能编辑。2) 文本行要响应单击事件，组合框要响应选择事件。两个事件处理方法执行由组合框指定的算术运算。3) 进行异常处理。当文本行中的字符串不能转换成整数时，弹出对话框显示指定信息，提示用户重新输入。
兄弟们不好意思，没财富值了。。。。不能悬赏了

Answer 1

import java.awt.BorderLayout;

public class demo extends JFrame {

	private JPanel contentPane;
	private JTextField textField;
	private JTextField textField_1;
	private JLabel lblNewLabel;
	private JTextField textField_2;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					demo frame = new demo();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public demo() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 75);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		textField = new JTextField();
		textField.setBounds(10, 10, 91, 21);
		contentPane.add(textField);
		textField.setColumns(10);
		
		
		textField_1 = new JTextField();
		textField_1.setBounds(176, 10, 91, 21);
		contentPane.add(textField_1);
		textField_1.setColumns(10);
		
		textField_2 = new JTextField();
		textField_2.setBounds(335, 10, 76, 21);
		contentPane.add(textField_2);
		textField_2.setColumns(10);
		
		JComboBox comboBox = new JComboBox();
		comboBox.setModel(new DefaultComboBoxModel(new String[] {"+","-","*","/"}));
		comboBox.setBounds(124, 10, 32, 21);
		contentPane.add(comboBox);
		comboBox.addItemListener(new ItemListener() {
			@Override
			public void itemStateChanged(ItemEvent e) {
				int stateChange = e.getStateChange();
				if(stateChange == 1){
					try {
						int text1 = Integer.parseInt(textField.getText());
						int text2 = Integer.parseInt(textField_1.getText());
						int text3=0;
						if("+".equals(e.getItem())) text3 = text1 + text2;
						if("-".equals(e.getItem())) text3 = text1 - text2;
						if("*".equals(e.getItem())) text3 = text1 * text2;
						if("/".equals(e.getItem())) text3 = text1 / text2;
						textField_2.setText(text3+"");
					} catch (Exception e2) {
						JOptionPane.showMessageDialog(null, "错误!!"+e2.getMessage());
					}
				}
			}
		});
		
		lblNewLabel = new JLabel("=");
		lblNewLabel.setBounds(284, 13, 24, 15);
		contentPane.add(lblNewLabel);
	}
}

追问

为啥我运行不了

追答

报什么错误

Answer 2

这个是我碰出来的。
package cxxx;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
public class Rnnn extends JFrame {

private JPanel contentPane;
private JTextField textField;
private JTextField textField_1;
private JLabel lblNewLabel;
private JTextField textField_2;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Rnnn frame = new Rnnn();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the frame.
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public Rnnn() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 75);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

textField = new JTextField();
textField.setBounds(10, 10, 91, 21);
contentPane.add(textField);
textField.setColumns(10);

textField_1 = new JTextField();
textField_1.setBounds(176, 10, 91, 21);
contentPane.add(textField_1);
textField_1.setColumns(10);

textField_2 = new JTextField();
textField_2.setBounds(335, 10, 76, 21);
contentPane.add(textField_2);
textField_2.setColumns(10);

JComboBox comboBox = new JComboBox();
comboBox.setModel(new DefaultComboBoxModel(new String[] {"+","-","*","/"}));
comboBox.setBounds(124, 10, 32, 21);
contentPane.add(comboBox);
comboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
int stateChange = e.getStateChange();
if(stateChange == 1){
try {
int text1 = Integer.parseInt(textField.getText());
int text2 = Integer.parseInt(textField_1.getText());
int text3=0;
if("+".equals(e.getItem())) text3 = text1 + text2;
if("-".equals(e.getItem())) text3 = text1 - text2;
if("*".equals(e.getItem())) text3 = text1 * text2;
if("/".equals(e.getItem())) text3 = text1 / text2;
textField_2.setText(text3+"");
} catch (Exception e2) {
JOptionPane.showMessageDialog(null, "错误!!"+e2.getMessage());
}
}
}
});

lblNewLabel = new JLabel("=");
lblNewLabel.setBounds(284, 13, 24, 15);
contentPane.add(lblNewLabel);
}
}