java的GUI实现闰年判定界面版

我会带着你远行 2022-02-01 14:09 236阅读 0赞

运行效果图：![在这里插入图片描述][20190514173803323.]

import java.awt.GridLayout;
    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;
    
    public class ShowGUI extends JFrame implements ActionListener{
    
        public static void main(String[] args) {
        	ShowGUI sg = new ShowGUI();
    
        }
    
    	private JPanel jp1;
    	private JPanel jp2;
    	private JLabel label;
    	private JTextField textField;
    	private JButton button;
    
        // 构造函数
        public ShowGUI() {
            jp1 = new JPanel();
            jp2 = new JPanel();
            //文本框前面的标签
            label = new JLabel("请输入有效的年份");
            //文本输入框
            textField = new JTextField(10);
            //按钮
            button = new JButton("判定");
    
            this.setLayout(new GridLayout(3, 3));
    
            // 加入各个组件
            jp1.add(label);
            jp1.add(textField);
    
            jp2.add(button);
    
            // 加入到JFrame
            this.add(jp1);
            this.add(jp2);
            
            // 为按钮 注册事件监听器
            button.addActionListener(this);
            
            this.setSize(250, 250);
            this.setTitle("闰年判定");
            this.setLocation(100, 100);
            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            this.setVisible(true);
        }
        
        public boolean isRN(String year){
        	Integer yearInt = Integer.valueOf(year);
        	if(yearInt % 4 == 0 && yearInt % 100 != 0 || yearInt % 400 == 0){
        		return true;
        	}
        	return false;
        }
    
    	@Override
    	public void actionPerformed(ActionEvent e) {
    		String year = textField.getText();
    		try {
    			if (year == null || year.trim().length() == 0) {
    				JOptionPane.showMessageDialog(null, "年不能为空！", "警告",
    						JOptionPane.WARNING_MESSAGE);
    			}
    			boolean b = isRN(year);
    			// 判断是否是闰年
    			if (b) {
    				JOptionPane.showMessageDialog(null, year + "年是闰年！", "信息",
    						JOptionPane.INFORMATION_MESSAGE);
    			} else {
    				JOptionPane.showMessageDialog(null, year + "年不是闰年！", "信息",
    						JOptionPane.INFORMATION_MESSAGE);
    			}
    		} catch (Exception e2) {
    			JOptionPane.showMessageDialog(null, "请输入有效的年！", "错误",
    					JOptionPane.ERROR_MESSAGE);
    		}
    	}
    }

顺便做成了exe文件。电脑有jdk的话直接可以运行。[https://download.csdn.net/download/weixin\_42884584/11179845][https_download.csdn.net_download_weixin_42884584_11179845]  
![在这里插入图片描述][2019051514401133.]

[20190514173803323.]: /images/20220201/87c3e6f41b2b467dbc0086caef2c5593.png
[https_download.csdn.net_download_weixin_42884584_11179845]: https://download.csdn.net/download/weixin_42884584/11179845
[2019051514401133.]: /images/20220201/cccebae4d08f47d195d50b51abb1dd46.png