Java CharacterIterator previous()方法及示例

Java中 java.text .CharacterIterator接口 的 previous() 方法用于获取该CharacterIterator所要读取的前一个字符。该方法将该迭代器向后递减一个索引并返回该前一个字符。

语法。

public char previous()

参数。此方法不接受任何参数。

返回值。该方法返回该CharacterIterator所要读取的前一个字符。

异常。此方法不抛出任何异常。

程序。

// Java program to demonstrate
// the above method
  
import java.text.*;
import java.util.*;
  
public class CharacterIteratorDemo {
    public static void main(String[] args)
    {
  
        CharacterIterator characterIterator
            = new StringCharacterIterator(
                "GeeksForGeeks");
  
        characterIterator.next();
  
        System.out.println("Current character: "
                           + characterIterator
                                 .current());
  
        System.out.println("Previous character: "
                           + characterIterator
                                 .previous());
    }
}

输出:

Current character: e
Previous character: G

参考资料: https://docs.oracle.com/javase/9/docs/api/java/text/CharacterIterator.html#previous-