java字符串数组拼接方法
    ## Java String Array Concatenation Methods.
    Java provides multiple methods to concatenate strings, including arrays of strings. Here are some commonly used methods:
    ### 1. Using the `+` Operator.
    The simplest method to concatenate strings is by using the `+` operator. This operator can be used to concatenate two or more strings, including arrays of strings.
    java.
    String[] arr1 = {"Hello", "World"};
    String[] arr2 = {"!"};
    String result = arr1[0] + arr1[1] + arr2[0];
    System.out.println(result); // Output: HelloWorld!
    ### 2. Using the `StringBuilder` Class.
    The `StringBuilder` class provides a more efficient way to concatenate strings. It uses a mutable sequence of characters to build the final string, avoiding the creation of intermediate strings.
    java.
    String[] arr1 = {"Hello", "World"};
    String[] arr2 = {"!"};
逗号分割字符串转数组    StringBuilder result = new StringBuilder();
    for (String s : arr1) {。
        result.append(s);
    }。
    for (String s : arr2) {。
        result.append(s);
    }。
    System.out.println(result); // Output: HelloWorld!
    ### 3. Using the `String.join()` Method.
    The `String.join()` method is another convenient way to concatenate strings. It takes a delimiter as an argument and joins the elements of an array into a single string.
    java.
    String[] arr1 = {"Hello", "World"};
    String[] arr2 = {"!"};
    String result = String.join("", arr1) + String.join("", arr2);
    System.out.println(result); // Output: HelloWorld!
    ### 4. Using the `String()` Method.
    The `String()` method can be used to convert an array of strings into a single string. The resulting string is enclosed in square brackets and the elements are separated by commas.

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