StringBuilder類codePointBefore()方法 (StringBuilder Class codePointBefore() method)

• codePointBefore() method is available in java.lang package.

  codePointBefore()方法在java.lang包中可用。

• codePointBefore() method is used to represent the Unicode code point before the given index and array indexing starts from 0 to length() - 1.

  codePointBefore()方法用于表示給定索引和數組索引從0開始到length()-1之前的Unicode代碼點。

• codePointBefore() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  codePointBefore()方法是一個非靜態方法，只能使用類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• codePointBefore() method may throw an exception at the time of assigning index.

  在分配索引時， codePointBefore()方法可能會引發異常。

  IndexOutOfBoundsException - This exception may throw when the given argument value is not less than the length or denotes negative value.

  IndexOutOfBoundsException-當給定的參數值不小于長度或表示負值時，可能引發此異常。

Syntax:

句法：

public int codePointBefore(int indices)

Parameter(s):

參數：

• int indices – represents the index of following the Unicode code point that should be retrieved.

  int index –表示應檢索的Unicode代碼點之后的索引。

Return value:

返回值：

The return type of this method is int, t returns the Unicode code point before the given indices.

此方法的返回類型為int ，t返回給定索引之前的Unicode代碼點。

Example:

例：

// Java program to demonstrate the example // of int codePointBefore(int indices) method of StringBuilder public class CodePointBefore {public static void main(String[] args) {// Creating an StringBuilder objectStringBuilder st_b = new StringBuilder("Java");System.out.println("st_b = " + st_b);// By using codePointBefore(2) method is to return the codepoint// at before the given index 2 i.e. it returns codepoint at // following the given index i.e index 1int cp = st_b.codePointBefore(2);// Display codepoint value at before the given index 2System.out.println("st_b.codePointBefore(2)=" + cp);} }

Output

輸出量

st_b = Java st_b.codePointBefore(2)=97

翻譯自: https://www.includehelp.com/java/stringbuilder-codepointbefore-method-with-example.aspx

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