Java中mouseListener和mouseMotionListener的区别？

Question

当鼠标移动到组件上时，mouseMotionListener是否会触发事件，而mouseListener只会在我按下按钮时触发？

所以如果我只有一个mousePressed事件，那么我就不需要mouseMotionListener了？如果我有mouseEntered或mouseExited的话？

Answer 1

是的，你是对的。当鼠标移动到“热点”上时，mouseMotionListener用于执行操作。

here就是一个很好的例子

在处理mousePressed事件时，您只需要mousePressed事件，除非您想要在鼠标悬停时添加更多要执行的事件。

Answer 2

它们监听不同的事件：

MouseListener

mouseClicked(MouseEvent event)   // Called just after the user clicks the listened-to component.
mouseEntered(MouseEvent event)   // Called just after the cursor enters the bounds of the listened-to component.
mouseExited(MouseEvent event)    // Called just after the cursor exits the bounds of the listened-to component.
mousePressed(MouseEvent event)   // Called just after the user presses a mouse button while the cursor is over the listened-to component.
mouseReleased(MouseEvent event)  // Called just after the user releases a mouse button after a mouse press over the listened-to component

MouseMotionListener

mouseDragged(MouseEvent event)   // Called in response to the user moving the mouse while holding a mouse button down. This event is fired by the component that fired the most recent mouse-pressed event, even if the cursor is no longer over that component.
mouseMoved(MouseEvent event)     // Called in response to the user moving the mouse with no mouse buttons pressed. This event is fired by the component that's currently under the cursor.

根据你想要的事件添加监听器。