StringBuilder类codePointAt()方法 (StringBuilder Class codePointAt() method)

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

  codePointAt()方法在java.lang包中可用。

• codePointAt() method is used to return the Unicode code point at the given indices and array indexing starts at 0 and ending at length () - 1.

  codePointAt()方法用于返回给定索引处的Unicode代码点，数组索引从0开始，以length()-1结尾。

• codePointAt() 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.

  codePointAt()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  分配索引时， codePointAt()方法可能会引发异常。

  IndexOutOfBoundsException - This exception may throw when the given argument value is greater than the length or denotes negative value.

  IndexOutOfBoundsException-当给定参数值大于长度或表示负值时，可能引发此异常。

Syntax:

句法：

    public int codePointAt(int indices);

Parameter(s):

参数：

• int indices – represents the index to the referred character values.

  int index –表示引用字符值的索引。

Return value:

返回值：

The return type of this method is int, it returns the Unicode code point of the char at the given indices.

此方法的返回类型为int ，它返回给定索引处char的Unicode代码点。

Example:

例：

// Java program to demonstrate the example
// of int codePointAt(int indices) method of StringBuilder
public class CodePointAt {public static void main(String[] args) {// Creating an StringBuilder object
StringBuilder st_b = new StringBuilder("Java");
System.out.println("st_b = " + st_b);
// By using codePointAt(2) method is to return the codepoint
// at the given index 2
int cp = st_b.codePointAt(2);
// Display codepoint value at the given index 2
System.out.println("st_b.codePointAt(2)=" + cp);
}
}

Output

输出量

st_b = Java
st_b.codePointAt(2)=118

翻译自: https://www.includehelp.com/java/stringbuilder-codepointat-method-with-example.aspx