两个相同的字符串将不等于true

时间:2020-08-28 06:38:15

标签: android string kotlin equals

我想比较来自两个不同列表的两个String对象,无论我是否使用 GridViewequals()contentEquals(),始终为假。

与第一个列表的字符串放入其中有什么关系吗?

编辑:这张图片中的日志结果变得很奇怪:

enter image description here

==

以上代码的输出日志: Outcome of the logging

编辑

                        DictWord.dictWords.forEach {
                            Log.i("testen", "it is: $it and equals 'black'? - ${it.equals("black")}")
                            Log.i("testen", "it is: $it and equals $newWord - ${it.equals(newWord)}")
                            Log.i("testen", "it is: $it and equals $newWord - ${it.contentEquals("black")}")
                            Log.i("testen", "it is: $it and == $newWord - ${it == newWord}")
                            Log.i("black", "it is: 'black' and equals $newWord - ${"black" == newWord}")


...    subStrainsAdapter.addHeaderAndSubmitList(null)
            var textList = mutableListOf<String>()
            var movingText = ""
            thoughtContent.addTextChangedListener(object : TextWatcher {
                override fun afterTextChanged(s: Editable) {}
                override fun beforeTextChanged(
                    s: CharSequence,
                    start: Int, count: Int, after: Int) {}
                override fun onTextChanged(
                    s: CharSequence,
                    start: Int, before: Int, count: Int)
                {movingText += s.last()}
            })

            //SUBSTRAIN INPUT - goes to onSubStrainEditEnd above when ENTER hit
            thoughtContent.setOnKeyListener(object : View.OnKeyListener {
                @RequiresApi(Build.VERSION_CODES.Q)
                override fun onKey(v: View?, key: Int, event: KeyEvent): Boolean {
                    return if (event.action == KeyEvent.ACTION_DOWN && key == KeyEvent.KEYCODE_SPACE) {
                        textList.add(movingText)
                        movingText = ""
                        false } else false
                }})

2 个答案:

答案 0 :(得分:2)

newWord似乎没有被修剪。在您的日志中,它前面有多余的空间。

enter image description here

日志中的这两行分别与此代码相对应:

Log.i("testen", "it is: $it and equals 'black'? - ${it.equals("black")}")
Log.i("testen", "it is: $it and equals $newWord - ${it.equals(newWord)}")

您可以看到您没有在第二行中添加两个空格,但是黑色之前仍然有多余的空格


您应该更正列表或执行newWord.trim(),这会删除所有前导和尾随空格

否则,您应始终使用String.equals(otherString: String)s1 == s2(在kotlin中它们是相同的)

答案 1 :(得分:0)

您的示例格式错误,我相信会丢失一些代码,但是正如@snachmsm指出的那样,contentEquals是Kotlin中用于数组的方法。您应该使用equals()代替字符串(尽管==是Kotlin的首选方式)