java swing 设置文本框（输入框）限制只能输入数字（完美解决）

￡神魔★判官ぃ 2023-10-13 17:46 185阅读 0赞

### java swing 设置文本框只能输入数字（完美解决） ###

> 核心代码

private JTextField textField_1 = new JTextField();
    		textField_1.setBounds(10, 10, 66, 21);
    		frame.getContentPane().add(textField_1);
    		textField_1.setColumns(10);
    		textField_1.addKeyListener(new KeyAdapter() {
        
    			public void keyTyped(KeyEvent e) {
        
    				
    				String key="0123456789";
    				if(key.indexOf(e.getKeyChar())<0){
        
    					e.consume();//如果不是数字则取消
    				}
    			}
    		});

#### 整体代码 text.java ####

import java.awt.EventQueue;
    import java.awt.event.KeyAdapter;
    import java.awt.event.KeyEvent;
    
    import javax.swing.JFrame;
    import javax.swing.JTextField;
    import java.awt.BorderLayout;
    
    public class Text {
        
    
    	private JFrame frame;
    	private JTextField textField;
    	private JTextField textField_1;
    
    	/**
    	 * Launch the application.
    	 */
    	public static void main(String[] args) {
        
    		EventQueue.invokeLater(new Runnable() {
        
    			public void run() {
        
    				try {
        
    					Text window = new Text();
    					window.frame.setVisible(true);
    				} catch (Exception e) {
        
    					e.printStackTrace();
    				}
    			}
    		});
    	}
    
    	/**
    	 * Create the application.
    	 */
    	public Text() {
        
    		initialize();
    	}
    
    	/**
    	 * Initialize the contents of the frame.
    	 */
    	private void initialize() {
        
    		frame = new JFrame();
    		frame.setBounds(100, 100, 450, 300);
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.getContentPane().setLayout(null);
    		
    		textField_1 = new JTextField();
    		textField_1.setBounds(10, 10, 66, 21);
    		frame.getContentPane().add(textField_1);
    		textField_1.setColumns(10);
    		textField_1.addKeyListener(new KeyAdapter() {
        
    			public void keyTyped(KeyEvent e) {
        
    				
    				String key="0123456789";
    				if(key.indexOf(e.getKeyChar())<0){
        
    					e.consume();//如果不是数字则取消
    				}
    			}
    		});
    		
    		
    	
    	}
    }
    
           });

> PS: 如果想要在字符里面输入其他的字符，只需要在String key = “” 字符串添加即可想要输入的字符串即可；  
> 例子：String key = “A” 那么文本框就只能输入A