Java Character offsetByCodePoints()方法

Character.offsetByCodePoints(CharSequence seq, int index, int codePointOffset) 是java中的一个内置方法，用于返回在给定的字符序列中，从给定的索引中偏移的codePointOffset代码点。在index和codePointOffset给定的文本范围内，未配对的代用品各算作一个代码点。

语法

public static int offsetByCodePoints(CharSequence seq, int index, int codePointOffset)

参数

• seq – 字符序列
• index – 要偏移的索引
• codePointOffset – 以代码点为单位的偏移量

返回值： Character类的这个方法返回char序列中的索引。

异常情况 。

• NullPointerException – 如果seq为空。
• IndexOutOfBoundsException – 如果index是负的或者大于char序列的长度，或者codePointOffset是正的并且从index开始的子序列的代码点少于codePointOffset，或者codePointOffset是负的并且index之前的子序列的代码点少于codePointOffset的绝对值。

下面是说明上述方法的程序。

程序1 :

// Code to illustrate the offsetByCodePoints() method
import java.lang.*;
 
public class gfg {
 
    public static void main(String[] args)
    {
 
        // Create a CharSequence s and assign value
        CharSequence s = "Hello World";
 
        // Result of offsetByCodePoints on s
        String str = "The index within the char sequence s is " +
        Character.offsetByCodePoints(s, 2, 6);
 
        // Print str value
        System.out.println(str);
    }
}

输出

The index within the char sequence s is 8

程序2

// Code to illustrate the offsetByCodePoints() method
 
import java.lang.*;
 
public class gfg {
 
    public static void main(String[] args)
    {
 
        // Create a CharSequence s and assign value
        CharSequence s = "geeks for geeks";
 
        // Result of offsetByCodePoints on s
        String str = "The index within the char sequence s is " +
        Character.offsetByCodePoints(s, 3, 8);
 
        // Print str value
        System.out.println(str);
    }
}

输出

The index within the char sequence s is 11