Java 中的排序器上一个()方法，带示例

原文:https://www . geeksforgeeks . org/collectionelementiterator-previous-method-in-Java-with-examples/

Java . text . collectionelementtiterator 类的 previous() 方法用于获取 previous Collator 元素。这个方法将迭代器推到前一个元素并返回它的值。

语法:

public int previous()

参数:该方法不接受任何参数。

返回值:该方法返回上一个排序器元素的值。

以下是说明先前()方法的示例:

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

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/collectionelementtiterator . html # next–

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