java String.join

在Java中，`String.join()`方法用于将一个字符串数组（或可迭代对象）中的元素连接成一个字符串。它接受两个参数：连接符和要连接的元素。

下面是`String.join()`方法的使用示例：

String[] words = {"Hello", "World", "!"};
String joinedString = String.join(" ", words);
System.out.println(joinedString);

输出结果为：

Hello World !

在这个示例中，我们将字符串数组`words`中的元素用空格连接起来，并将结果赋值给`joinedString`变量。然后，我们使用`System.out.println()`方法打印出连接后的字符串。

希望这能帮到你！如果你有任何其他问题，请随时问。

相关问题

Static member 'java.lang.String.join(java.lang.CharSequence, java.lang.CharSequence...)' accessed via instance reference

The error message "Static member 'java.lang.String.join(java.lang.CharSequence, java.lang.CharSequence...)' accessed via instance reference" occurs when you try to call the static method `join` on an instance of the `String` class instead of calling it on the class itself.

The `join` method is used to join a group of strings together with a delimiter. It takes two parameters: a delimiter and an array of strings. Here is an example of how to use it:

String[] words = {"hello", "world", "how", "are", "you"};
String joinedWords = String.join(" ", words);
System.out.println(joinedWords);

In this example, we create an array of strings called `words`, and then use the `join` method of the `String` class to join the strings together with a space delimiter.

If you see the error message "Static member 'java.lang.String.join(java.lang.CharSequence, java.lang.CharSequence...)' accessed via instance reference", it means that you are calling the `join` method on an instance of the `String` class, rather than on the class itself. To fix the error, make sure you call the method on the class, like this:

String[] words = {"hello", "world", "how", "are", "you"};
String joinedWords = String.join(" ", words);
System.out.println(joinedWords);

Note that in the corrected code, we are calling the `join` method on the `String` class itself, not on an instance of the `String` class.

java中string.join的用法

Java中的string.join方法用于将一个字符串数组或集合中的元素连接成一个字符串，可以指定连接符作为参数。例如：

String[] arr = {"hello", "world", "!"};
String joinedStr = String.join(" ", arr);
System.out.println(joinedStr); // 输出：hello world !

上面的代码将字符串数组arr中的元素用空格连接成一个字符串。

另外，string.join方法还可以接收一个Iterable类型的参数，例如：

List<String> list = Arrays.asList("hello", "world", "!");
String joinedStr = String.join(" ", list);
System.out.println(joinedStr); // 输出：hello world !

上面的代码将List集合中的元素用空格连接成一个字符串。