java 获取button的值,从jButton获取文本值

最新推荐文章于 2024-06-20 12:40:54 发布

周含露

最新推荐文章于 2024-06-20 12:40:54 发布

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文章标签： java 获取button的值

本文探讨了Java中按钮点击事件代码为何if(jButton1.getText()==X)不生效，而if(jButton1.getText().equals(X))却有效。作者揭示了可能的原因——字符串比较的equals()方法与==的区别，以及版本间可能存在的String对象内部缓存现象。解决办法是确保所有版本使用equals()进行内容比较。

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So I need to simply check whether a clicked button's text is "X" or "O" (making tic tac toe)

This code doesn't work:

if (jButton1.getText()=="X")

However the following code does work:

String jButText = jButton1.getText();

if (jButText=="X")

Why doesn't the first bit of code work when the second does? Does it need to be something more like if (jButton1.getText().toString=="X")? By the way, I don't think toString exists in Java. That is just somewhat the equivalent in Visual Basic, which is what I normally use to create GUIs.

解决方案

This behavior is not reproducible in java 1.7.0_45 or 1.7.0_25, it might be a weird occurrence of String interning for your java version.

In order for your code to work properly on all java versions you have to use equals()

== compares objects meanwhile .equals() compares the content of the string objects.

jButton1.getText().equals("X")