字符串startsWith()方法 (String startsWith() Method)

startsWith() method is a String class method, it is used to check whether a given string starts with specific character sequences or not.

startsWith()方法是一個String類方法，用于檢查給定的字符串是否以特定的字符序列開頭。

If a string starts with given character sequences – startsWith() method returns true, if a string does not start with the given character sequences – startsWith() method returns false.

如果字符串以給定的字符序列開頭-startsWith()方法將返回true ，如果字符串不是以給定的字符序列開頭-則startsWith()方法將返回false 。

Syntax:

句法：

boolean String_object.startsWith(character_sequence);

Here,

這里，

• String_object is the main string in which we have to check whether it starts with given character_sequence or not.

  String_object是主要字符串，我們必須在其中檢查是否以給定的character_sequence開頭。

• character_sequence is the set of character to be checked.

  character_sequence是要檢查的字符集。

Example:

例：

Input:str = "Hello world!"Function call:str.startsWith("Hello");Output:trueInput:str = "IncludeHelp"Function call:str.startsWith("inc");Output:false

Code:

碼：

public class Main {public static void main(String[] args) {String str1 = "Hello world!";String str2 = "IncludeHelp";System.out.println(str1.startsWith("Hello"));System.out.println(str1.startsWith("inc"));//checking through the conditionsif(str1.startsWith("Hello")){System.out.println(str1 + " starts with Hello" );}else{System.out.println(str1 + " does not start with Hello" );}//note: method is case sensitiveif(str2.startsWith("inc")){System.out.println(str2 + " starts with inc" );}else{System.out.println(str2 + " does not start with inc" );} } }

Output

輸出量

true false Hello world! starts with Hello IncludeHelp does not start with inc

翻譯自: https://www.includehelp.com/java/string-startsWith-method-with-example.aspx

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