Java监听器三种实现方法代码解析

//创建一个自定义监听器
 private btnlistener btnl = new btnlistener();

 //必须在一个btn创建后才添加监听器，即在类里面无法添加但构造函数可以
 btn.addActionListener(btnl);

 //自定义监听器的内容
 private class btnlistener implements ActionListener {
    @Override //实现接口(interface)
    public void actionPerformed(ActionEvent e) {
      //Your Code Here
    }
  }

btn.addActionListener(new ActionListener{
	@Override
	public void actionPerformamed(ActionEvent e){
	//your code
	}
})

btn.addActionListener( (e)->{
	//your code
} )