Java BreakIterator previous()用法及代码示例

java.text.BreakIterator类的previous()方法用于获取当前边界后面的前一个边界的索引(通过调用current()方法检索边界)。它提供了由BreakIterator指向的当前边界之前的第一个边界字符的偏移量。

用法:

public abstract int previous()

参数：此方法不接受任何参数。

返回值：此方法提供当前边界之后的前一个边界的索引。

下面是说明previous()方法的示例：

示例1:

// Java program to demonstrate previous() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        // creating and initializing with zero 
        int current = 0, next = 0; 
  
        // creating and initializing BreakIterator 
        BreakIterator wb 
            = BreakIterator.getWordInstance(); 
  
        // setting text for BreakIterator 
        wb.setText("Code  Geeks"); 
  
        // setting the current position to index 11 
        // By skipping 3 boundaries 
        wb.next(3); 
  
        // getting the current text boundary 
        current = wb.current(); 
  
        // display the result 
        System.out.println( 
            "current position before"
            + " calling previous() : "
            + current); 
  
        // calling previous() method 
        next = wb.previous(); 
  
        // display the result 
        System.out.println( 
            "\ncurrent position after"
            + " calling 1st previous() : "
            + next); 
  
        // calling previous() method 
        next = wb.previous(); 
  
        // display the result 
        System.out.println( 
            "\ncurrent position after"
            + " calling 2nd previous() : "
            + next); 
    } 
}

输出：

current position before calling previous() : 11

current position after calling 1st previous() : 6

current position after calling 2nd previous() : 4

示例2:

// Java program to demonstrate 
// previous() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        // creating and initializing with zero 
        int current = 0, next = 0; 
  
        // creating and initializing BreakIterator 
        BreakIterator wb 
            = BreakIterator.getWordInstance(); 
  
        // setting text for BreakIterator 
        wb.setText("GeeksForGeeks"); 
  
        // setting the current position to index 11 
        // By skipping 3 boundaries 
        wb.next(3); 
  
        // getting the current text boundary 
        current = wb.current(); 
  
        // display the result 
        System.out.println( 
            "current position before"
            + " calling previous() : "
            + current); 
  
        // calling previous() method 
        next = wb.previous(); 
  
        // display the result 
        System.out.println( 
            "\ncurrent position after"
            + " calling 1st previous() : "
            + next); 
  
        // calling previous() method 
        next = wb.previous(); 
  
        // display the result 
        System.out.println( 
            "\ncurrent position after"
            + " calling 2nd previous() : "
            + next); 
    } 
}

输出：

current position before calling previous() : 13

current position after calling 1st previous() : 0

current position after calling 2nd previous() : -1

参考： https://docs.oracle.com/javase/9/docs/api/java/text/BreakIterator.html#previous–

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 BreakIterator previous() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。