Java StringBuilder codePointAt（）方法与示例

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