java - 检查 boolean 值是否已在 Java 中更改

Question

我有一个带有布局和单个按钮的类。我想知道是否有内置方法或功能可以检测函数中的 boolean 值是否已更改。我可以用一堆其他 boolean 值来做到这一点，但我正在寻找一种更优雅的方式。我相信这与“观察者”有关，但我不完全确定。

简化版代码如下:

Class checker{

 boolean test1 = true;
 boolean test2 = true;

checker(){

checkNow.addActionListener(new ActionListener() {            
public void actionPerformed(ActionEvent e)
{   

//code to manage, and possibly change the value of the booleans test1 and test2.
//is there any built in function in java where i can test to see if the value of the booleans was changed in this actionListener function?

}
}}); 

}

Answer 1

[is] there was a built in method or functionality where I could detect if a booleans value had changed in the function?

您可以通过使用 setter 封装对 boolean 变量的访问来做到这一点:

private boolean test1 = true;
private boolean test2 = true;

private void setTest1(boolean newTest1) {
    if (newTest1 != test1) {
        // Do something
    }
}

private void setTest2(boolean newTest2) {
    if (newTest2 != test2) {
        // Do something
    }
}

用 setTest1 和 setTest2 调用替换这些变量的所有赋值，以可靠地检测 test1 和 test2.