java - I need to check the occurrence of a particular symbol at the beginning of my String

Question

I need to check the occurrence of a particular symbol say #$ at the beginning of my String.

Simply, I need to get the

boolean symbolExist true for all the following cases,

• #$MyString
• #$<Space>myString
• #$<Space><Space>myString
• #$<Space><space>my#$String
• #$My#$String
• etc. (never mind what ever coming after the 2 characters)

boolean symbolExist false for

• MyString#$
• My#$string
• etc .

Answer 1

您可以使用类的startsWith方法String：

String s = "#$test";
System.out.println(s.startsWith("#$"));

输出是true。

Answer 2

在 String 类中，我们有一个称为 boolean startsWith(String prefix) 的方法，使用这种方法可以解决您的问题。

String content = "#$MyString";

if(content.startsWith("#$")) //This will return true if String starts with "#$"
{

}

Answer 3

尝试这个 ：

boolean symbolExists ;
String myString;
if(myString.startsWith("#$"))
    symbolExists = true;
else
    symbolExists = false;