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                # Java `String startsWith()`方法 > 原文: [https://beginnersbook.com/2013/12/java-string-startswith-method-example/](https://beginnersbook.com/2013/12/java-string-startswith-method-example/) [字符串類](https://beginnersbook.com/2013/12/java-strings/)的`startsWith()`方法用于檢查字符串的前綴。它根據給定的字符串是否以指定的字母或單詞開頭,返回布爾值`true`或`false`。 **例如:** ```java String str = "Hello"; //This will return true because string str starts with "He" str.startsWith("He"); ``` ## Java `String startsWith()`方法 `StarsWith()`方法有兩種變體。 `boolean startsWith(String str)`:如果`String str`是`String`的前綴,則返回`true`。 `boolean startsWith(String str, index fromIndex)`:如果`String`以`str`開頭,則返回`true`,它從指定的索引`fromIndex`開始查找。例如,假設`String s`的值是`"Hi there"`,我們調用這樣的`starsWith()`方法 - `s.startsWith("there", 3)`然后這將返回`true`,因為我們已經將值 3 作為`fromIndex`傳遞,搜索關鍵字`"there"`從給定字符串`s`的索引 3 開始,并在字符串`s`的開頭找到。 ## `startsWith()`方法的一個簡單示例 這是一個簡單的例子,我們有一個字符串`s`,我們正在使用`startsWith()`方法檢查字符串`s`是否以特定的單詞開頭。 ```java public class JavaExample{ public static void main(String args[]){ //given string String s = "This is just a sample string"; //checking whether the given string starts with "This" System.out.println(s.startsWith("This")); //checking whether the given string starts with "Hi" System.out.println(s.startsWith("Hi")); } } ``` **輸出:** ![Java String startsWith method example](https://img.kancloud.cn/35/19/3519053e633efaa11c96dea1469694ae_922x680.jpg) ## Java `String startsWith()`方法示例 讓我們舉一個例子,我們使用`startsWith()`方法的兩種變體。 ```java public class StartsWithExample{ public static void main(String args[]) { String str= new String("quick brown fox jumps over the lazy dog"); System.out.println("String str starts with quick: "+str.startsWith("quick")); System.out.println("String str starts with brown: "+str.startsWith("brown")); System.out.println("substring of str(starting from 6th index) has brown prefix: " +str.startsWith("brown", 6)); System.out.println("substring of str(starting from 6th index) has quick prefix: " +str.startsWith("quick", 6)); } } ``` **輸出:** ```java String str starts with quick: true String str starts with brown: false substring of str(starting from 6th index) has brown prefix: true substring of str(starting from 6th index) has quick prefix: false ```
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