java Java 中的 BreakIterator previous()方法，示例

Java 中的 BreakIterator previous()方法，示例

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

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

语法:

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上一个边界的索引。

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 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

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