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CollationElementIterator previous() method in Java with Examples

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  • Last Updated : 03 Jan, 2020
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The previous() method of java.text.CollationElementIterator class is used to get previous Collator element. This method push the iterator to the previous element and returns its value.

Syntax:

public int previous()

Parameter: This method does accepts any parameter.

Return Value: This method returns the value of the previous collator element.

Below are the examples to illustrate the previous() method:

Example 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);
    }
}


Output:

current offset before calling previous() 3

current element value after calling previous() 5505024

Example 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());
    }
}


Output:

current offset before calling previous() 2

current offset after calling previous() 1

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


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