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                # Java `String concat()`方法 > 原文: [https://beginnersbook.com/2013/12/java-string-concat-method-example/](https://beginnersbook.com/2013/12/java-string-concat-method-example/) Java 字符串`concat()`方法連接多個字符串。此方法將指定的字符串附加到給定字符串的末尾,并返回組合的字符串。我們可以使用`concat()`方法連接多個字符串。 ## `concat()`方法簽名 ```java public String concat(String str) ``` 此方法將字符串 str 連接到當前字符串的末尾。例如 - `s1.concat("Hello");`會在`String s1`的末尾連接字符串`"Hello"`。可以在這樣的單個語句中多次調用此方法 ```java String s1="Beginners"; s1= s1.concat("Book").concat(".").concat("com"); ``` 執行上述聲明后,`s1`的值將為`BeginnersBook.com`。 ## Java `String concat`方法示例 在這個例子中,我們將看到使用`concat()`方法進行`String`連接的兩種方法。 ```java public class ConcatenationExample { public static void main(String args[]) { //One way of doing concatenation String str1 = "Welcome"; str1 = str1.concat(" to "); str1 = str1.concat(" String handling "); System.out.println(str1); //Other way of doing concatenation in one line String str2 = "This"; str2 = str2.concat(" is").concat(" just a").concat(" String"); System.out.println(str2); } } ``` **輸出:** ```java Welcome to String handling This is just a String ``` ## Java `String concat`方法的另一個例子 正如我們在上面看到的那樣,`concat()`方法將[字符串](https://beginnersbook.com/2013/12/java-strings/)附加到當前字符串的末尾。但是我們可以做一個解決方法,在給定字符串的開頭附加**指定的字符串。** ```java public class JavaExample { public static void main(String args[]) { String mystring = ".com"; String mystr = "BeginnersBook".concat(mystring); System.out.println(mystr); } } ``` **輸出:** ![Java String concat method example](https://img.kancloud.cn/4a/b9/4ab92078d31f7fc2bccf188ad26876c8_860x460.jpg)
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