The method addMouseListener(MouseListener) in the type Component is not applicable for the arguments (new MouseAdapter(){})

时间: 2024-03-22 22:37:35 浏览: 21
这个错误通常出现在你尝试将 MouseAdapter 添加到某个组件的鼠标监听器列表中时。这是因为 addMouseListener 方法需要的参数是 MouseListener 接口类型,而 MouseAdapter 只是 MouseListener 接口的一个适配器实现类,并不是 MouseListener 接口本身。所以你需要将 MouseAdapter 转换成 MouseListener 类型。 可以通过以下两种方式解决这个错误: 1. 将 MouseAdapter 强制转换成 MouseListener 类型,例如: ``` backButton.addMouseListener((MouseListener) new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { System.out.println("Button clicked"); } }); ``` 2. 直接使用匿名内部类实现 MouseListener 接口,例如: ``` backButton.addMouseListener(new MouseListener() { @Override public void mouseClicked(MouseEvent e) { System.out.println("Button clicked"); } @Override public void mousePressed(MouseEvent e) {} @Override public void mouseReleased(MouseEvent e) {} @Override public void mouseEntered(MouseEvent e) {} @Override public void mouseExited(MouseEvent e) {} }); ``` 这两种方式都可以将 MouseAdapter 添加到组件的鼠标监听器列表中,并在鼠标点击事件发生时执行相应的逻辑。

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代码We now want to always redraw all the points that have ever been drawn in the panel, not just the last point. To do this, we must save the coordinates of all these points so that we can redraw them all one by one in the paintComponent method every time this method is called. To save the coordinates of the various mouse positions we click, replace the x and y instance variables of the MyPanel class with a single private instance variable called points of type ArrayList. The Point class is provided to you by Swing. In the constructor of MyPanel, initialize the points instance variable with a new arraylist object of the same type. In the mouseClicked method of the mouse listener, use the getPoint method of the mouse event object to get a Point object representing the position of the mouse click (that Point object internally stores both the x and y coordinates of the mouse click event). Then add this Point object to the arraylist using the arraylist’s add method. Then, in the paintComponent method, add a loop to draw in the panel all the points of the arraylist. You can get the number of elements in the arraylist by using the size method of the arraylist; you can access a specific element of the arraylist at index i by using the get(i) method of the arraylist (element indexes start at zero in an arraylist). The Point class has getX and getY methods to get the coordinates of the point (these two methods return values of type double so you need to cast the returned values into the int type before you can use them to draw a point).

在ui设计器中from文件已经建好,我的代码如下,如何使用它import javax.swing.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; public class GRID extends JFrame { private JTabbedPane tabbedPane2; private JButton 结账Button; private JButton 取消订单Button; private JTable table1; private JTable table2; private JTable table3; private JTable table4; private JTable table5; private JTable table6; private JTable table7; private JTable table8; private JTextPane textPane1; public void GRID() { table2.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table1.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table3.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table4.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table5.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table6.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table7.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); table8.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { super.mouseClicked(e); } }); } public static void main(String[] args) { new GRID(); } }

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