Java CollationElementIterator previous()用法及代码示例

java.text.CollationElementIterator类的previous()方法用于获取先前的Collator元素。此方法将迭代器推到上一个元素并返回其值。

用法:

public int previous()

参数：此方法确实接受任何参数。

返回值：此方法返回上一个排序规则元素的值。

下面是说明previous()方法的示例：

范例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 testString 
        String test = "abcd"; 
  
        // creating and initializing 
        // RuleBasedCollator object 
        RuleBasedCollator rbc 
            = (RuleBasedCollator)(Collator.getInstance()); 
  
        // creating and initializing 
        // CollationElementIterator 
        CollationElementIterator cel 
            = rbc.getCollationElementIterator(test); 
  
        // setting offset to index 4 
        cel.setOffset(3); 
  
        // display the result 
        System.out.println("current offset before"
                           + " calling previous() "
                           + cel.getOffset()); 
  
        // getting offset of the previous collator element 
        // using previous() method 
        int value = cel.previous(); 
  
        // display the result 
        System.out.println("\ncurrent element value after"
                           + " calling previous() "
                           + value); 
    } 
}

输出：

current offset before calling previous() 3

current element value after calling previous() 5505024

范例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 testString 
        String test = "abcd"; 
  
        // creating and initializing 
        // RuleBasedCollator object 
        RuleBasedCollator rbc 
            = (RuleBasedCollator)(Collator.getInstance()); 
  
        // creating and initializing 
        // CollationElementIterator 
        CollationElementIterator cel 
            = rbc.getCollationElementIterator(test); 
  
        // setting offset to index 2 
        cel.setOffset(2); 
  
        // display the result 
        System.out.println("current offset before"
                           + " calling previous() "
                           + cel.getOffset()); 
  
        // getting offset of the previous collator element 
        // using previous() method 
        int value = cel.previous(); 
  
        // display the result 
        System.out.println("\ncurrent offset after"
                           + " calling previous() "
                           + cel.getOffset()); 
    } 
}

输出：

current offset before calling previous() 2

current offset after calling previous() 1

参考： https://docs.oracle.com/javase/9/docs/api/java/text/CollationElementIterator.html#next-

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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 CollationElementIterator 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。