Java Scanner useLocale()方法及示例

java.util.Scanner 类的 useLocale() 方法将该扫描仪的locale设置为指定的locale。

语法

public Scanner useLocale(Locale locale)

参数： 该函数接受一个强制性参数 locale ，它指定了一个字符串，指明要使用的locale。

返回值： 该函数返回这个 修改后的扫描仪

异常： 如果radix小于Character.MIN_RADIX或大于Character.MAX_RADIX，那么将抛出IllegalArgumentException。

下面的程序说明了上述函数。

程序1 :

// 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

程序2

// 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

**参考资料: ** https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#useLocale(java.util.Locale)