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                # Java `String trim()`和`hashCode()`方法 > 原文: [https://beginnersbook.com/2013/12/java-string-trim-and-hashcode-methods/](https://beginnersbook.com/2013/12/java-string-trim-and-hashcode-methods/) 在本教程中,我們將在示例的幫助下討論 Java `String trim()`和`hashCode()`方法。 ## Java `String trim()`方法簽名 從輸入`String`中刪除前導和尾隨空格后,它返回一個`String`。對于例如`" ? ? Hello".trim()`將返回`String "Hello"`。 ```java public String trim() ``` ## Java `String trim()`方法示例 在下面的例子中,我們有一個帶有前導和尾隨空格的字符串,我們使用`trim()`方法去除這些前導和尾隨空格,但是我們想要保留給定字符串的單詞之間的空格`str`。`trim()`方法僅刪除前導和尾隨空格,并將空格保留在空格中。 ```java public class JavaExample{ public static void main(String args[]){ String str = new String(" How are you?? "); System.out.println("String before trim: "+str); System.out.println("String after trim: "+str.trim()); } } ``` **輸出:** ![Java String trim() method example](https://img.kancloud.cn/c7/7d/c77d3f4daf8741d271886991bcb24e25_942x504.jpg) ## Java `String hashCode()`方法簽名 此方法返回`String`的哈希碼。計算如下: ```java s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1] ``` ```java public int hashCode() ``` ## Java `hashCode()`方法示例 在下面的示例中,我們有一個字符串`str`,其值為`"Welcome !!"`,我們使用`hashCode()`方法顯示該值的哈希碼。 ```java public class JavaExample{ public static void main(String args[]){ String str = new String("Welcome!!"); System.out.println("Hash Code of the String str: "+str.hashCode()); } } ``` **輸出:** ![Java String hashCode() method example](https://img.kancloud.cn/05/a4/05a4a4f87c2c1185322ffb31b0f3a331_1024x407.jpg) #### 參考: 1. [`Object.hashCode()` JavaDoc](https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#hashCode()) 2. [`String.hashCode()` JavaDoc](https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#hashCode()) 3. [`trim() JavaDoc](https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#trim())
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