Java窗口之文本框、按钮、菜单

╰+哭是因爲堅強的太久メ 2021-12-05 15:37 499阅读 0赞

**文本框、按钮、文本域**

import java.awt.Button;
    import java.awt.FlowLayout;
    import java.awt.Frame;
    import java.awt.TextArea;
    import java.awt.TextField;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
    
    public class FrameDemo {
    	public static void main(String[] args) {
    		// 创建窗体对象
    		Frame f = new Frame();
    		// Frame ff = new Frame("ahahahah") 构造给窗体标题
    
    		// 设置窗体标题
    		f.setTitle("hahahaha");
    
    		// 调节窗口大小
    		f.setSize(500, 500);
    		// 设置窗口位置
    		// f.setLocation(400,200);
    
    		// f.setBounds(x, y, width, height);
    		// 设置窗口居中
    		f.setLocationRelativeTo(null);
    
    		// 流式布局
    		f.setLayout(new FlowLayout());
    
    		// 创建文本框
    		TextField tf = new TextField(20); // 可以存20个字符
    
    		// 创建按钮
    		Button bu = new Button("数据转移");
    
    		// 创建文本域
    		TextArea ta = new TextArea(10, 40);
    
    		// 组件添加到窗体
    		f.add(tf);
    		f.add(bu);
    		f.add(ta);
    
    		// 对按钮添加事件
    		bu.addActionListener(new ActionListener() {
    
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				// TODO Auto-generated method stub
    				// 获取文本框的值
    				String tf_str = tf.getText().trim();
    				// 清空数据
    				tf.setText("");
    
    				// 设置给文本域
    				// ta.setText(tf_str);
    
    				// 字符串比较
    				if (tf_str.equals("123")) {
    					// 追加和换行
    					ta.append("123" + "\r\n");
    				} else
    					ta.append("输错了" + "\r\n");
    
    				// 获取光标
    				tf.requestFocus();
    			}
    		});
    
    		// 适配器改进窗口关闭
    		f.addWindowListener(new WindowAdapter() {
    			@Override
    			public void windowClosing(WindowEvent e) {
    				// TODO Auto-generated method stub
    				System.exit(0);
    			}
    		});
    		// 窗体可见
    		f.setVisible(true);
    	}
    }

**鼠标移动按钮更改背景颜色：**

import java.awt.Button;
    import java.awt.Color;
    import java.awt.FlowLayout;
    import java.awt.Frame;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
    
    
    
    public class FrameDemo2 {
    
    	public static void main(String[] args) {
    		//创建窗体
    		Frame f = new Frame("按钮颜色");
    		//大小
    		f.setSize(500, 400);
    		//居中
    		f.setLocationRelativeTo(null);
    		//流式布局
    		f.setLayout(new FlowLayout());
    		//设置按钮
    		Button redButton = new Button("红色");
    		Button greenButton = new Button("绿色");
    		Button blueButton = new Button("蓝色");
    		
    		f.add(redButton);
    		f.add(greenButton);
    		f.add(blueButton);
    		
    		//窗口关闭
    		f.addWindowListener(new WindowAdapter() {
    			@Override
    			public void windowClosing(WindowEvent e) {
    				// TODO Auto-generated method stub
    				System.exit(0);
    			}
    		});
    		
    		//对按钮添加动作事件
    //		redButton.addActionListener(new ActionListener() {
    //			@Override
    //			public void actionPerformed(ActionEvent e) {
    //				// TODO Auto-generated method stub
    //				f.setBackground(Color.red);
    //			}
    //		});
    		
    		//对按钮的单击事件
    //		redButton.addMouseListener(new MouseAdapter() {
    //			@Override
    //			public void mouseClicked(MouseEvent e) {
    //				// TODO Auto-generated method stub
    //				f.setBackground(Color.red);
    //			}
    //		});
    		
    		//对按钮添加鼠标进入事件
    		redButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				// TODO Auto-generated method stub
    				f.setBackground(Color.red);
    			}
    		});
    		//对按钮添加离开事件
    		redButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseExited(MouseEvent e) {
    				// TODO Auto-generated method stub
    				f.setBackground(Color.white);
    			}
    		});
    		
    		//对按钮添加鼠标进入事件
    		greenButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				// TODO Auto-generated method stub
    				f.setBackground(Color.green);
    			}
    		});
    		//对按钮添加离开事件
    		greenButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseExited(MouseEvent e) {
    				// TODO Auto-generated method stub
    				f.setBackground(Color.white);
    			}
    		});
    		
    		//对按钮添加鼠标进入事件
    		blueButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				// TODO Auto-generated method stub
    				f.setBackground(Color.blue);
    			}
    		});
    		//对按钮添加离开事件
    		blueButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseExited(MouseEvent e) {
    				// TODO Auto-generated method stub
    				f.setBackground(Color.white);
    			}
    		});
    		//窗体可见
    		f.setVisible(true);
    	}
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tvbmdzYW5qaW4_size_16_color_FFFFFF_t_70][]

**文本框输入加限制：**

import java.awt.FlowLayout;
    import java.awt.Label;
    import java.awt.TextField;
    import java.awt.event.KeyAdapter;
    import java.awt.event.KeyEvent;
    
    import javax.swing.JFrame;
    
    public class JframeDemo {
    
    	public static void main(String[] args) {
    		
    		// Jframe 类创建窗口
    		JFrame jf = new JFrame("文本框");
    		
    		//大小
    		jf.setSize(400, 400);
    		
    		//居中
    		jf.setLocationRelativeTo(null);
    		
    		//流式布局
    		jf.setLayout(new FlowLayout());
    		Label label = new Label("只能输入数字，不信你试试！");
    		//创建文本框
    		TextField tf = new TextField(30);
    		
    		
    		//加入窗体
    		jf.add(label);
    		jf.add(tf);
    		
    		
    		//窗口可关闭
    		jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    		
    		//可见
    		jf.setVisible(true);
    		tf.addKeyListener(new KeyAdapter() {
    			@Override
    			public void keyPressed(KeyEvent e) {
    				// TODO Auto-generated method stub
    				char ch = e.getKeyChar();
    				if(!(ch>='0'&&ch<='9')) {
    					e.consume();
    				}
    			}
    		});
    	}
    }

**菜单**

import java.awt.event.InputEvent;
    import java.awt.event.KeyEvent;
    
    import javax.swing.ImageIcon;
    import javax.swing.JFrame;
    import javax.swing.JMenu;
    import javax.swing.JMenuBar;
    import javax.swing.JMenuItem;
    import javax.swing.KeyStroke;
    
    public class WIndowmenu extends JFrame{
    	//菜单条
    	JMenuBar menubar = new JMenuBar();
    	//创建菜单
    	JMenu menu = new JMenu("菜单");
    	JMenu subMenu = new JMenu("软件项目");
    	JMenuItem item,item2;
    	public WIndowmenu() {
    	}
    	@SuppressWarnings("deprecation")
    	public void init() {
    		setTitle("带菜单的窗口");
    		item = new JMenuItem("Java 话题",new ImageIcon("src\\menu\\aa.png"));
    		item2 = new JMenuItem("动画话题",new ImageIcon("src\\\\menu\\\\bb.png"));
    //		item.setAccelerator(KeyStroke.getKeyStroke('x'));
    //		item2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));
    		menu.add(item);
    		menu.addSeparator();
    		menu.add(item2);
    		menu.add(subMenu);
    		subMenu.add(new JMenuItem("汽车销售系统",new ImageIcon("src\\\\menu\\\\cc.png")));
    		subMenu.add(new JMenuItem("农场信息系统",new ImageIcon("src\\\\menu\\\\dd.png")));
    		menubar.add(menu);
    		setJMenuBar(menubar);
    		
    		setLocationRelativeTo(null);
    		setSize(400,300);
    		setVisible(true);
    		setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    	}
    	public static void main(String[] args) {
    		WIndowmenu indowmenu = new WIndowmenu();
    		indowmenu.init();
    	}
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tvbmdzYW5qaW4_size_16_color_FFFFFF_t_70 1][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tvbmdzYW5qaW4_size_16_color_FFFFFF_t_70 1]: /images/20211205/807da5777e064aa493b20fb917493e74.png