Java中的扫描器 useLocale() 方法及示例

Java.util.Scanner类的useLocale()方法将此扫描仪的语言环境设置为指定的语言环境。

句法：

public Scanner useLocale(Locale locale)

参数：该函数接受一个强制参数locale ，该参数指定一个字符串，指定要使用的语言环境。

返回值：函数返回这个修改后的扫描仪。

例外：如果基数小于字符.MIN_RADIX或大于字符.MAX_RADIX ，则抛出IllegalArgumentException 。

下面的程序说明了上述函数：

方案一：

// Java program to illustrate the
// Scanner useLocale() method in Java
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        String s = "Geeksforgeeks has Scanner Class Methods";
  
        // create a new scanner
        // with the specified String Object
        Scanner scanner = new Scanner(s);
  
        // print a line of the scanner
        System.out.println("Scanner String: \n"
                           + scanner.nextLine());
  
        // display the previous locale
        System.out.println("Current Lcoale: "
                           + scanner.locale());
  
        // change the locale of the scanner
        scanner.useLocale(Locale.ENGLISH);
        System.out.println("Changing Locale to ENGLISH");
  
        // display the new locale
        System.out.println("Updated Locale: "
                           + scanner.locale());
  
        // close the scanner
        scanner.close();
    }
}

输出：

Scanner String: 
Geeksforgeeks has Scanner Class Methods
Current Lcoale: en_US
Changing Locale to ENGLISH
Updated Locale: en

方案二：

// Java program to illustrate the
// Scanner useLocale() method in Java
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        String s = "Geeksforgeeks 2018";
  
        // create a new scanner
        // with the specified String Object
        Scanner scanner = new Scanner(s);
  
        // print a line of the scanner
        System.out.println("Scanner String: \n"
                           + scanner.nextLine());
  
        // display the previous locale
        System.out.println("Current Lcoale: "
                           + scanner.locale());
  
        // change the locale of the scanner
        scanner.useLocale(Locale.FRENCH);
        System.out.println("Changing Locale to FRENCH");
  
        // display the new locale
        System.out.println("Updated Locale: "
                           + scanner.locale());
  
        // close the scanner
        scanner.close();
    }
}

输出：

Scanner String: 
Geeksforgeeks 2018
Current Lcoale: en_US
Changing Locale to FRENCH
Updated Locale: fr

参考： https: Java Java.util.Locale)