Java Scanner reset()用法及代碼示例

java.util.Scanner類的reset()方法將重置此掃描器。重置掃描器時，它會丟棄所有可能由useDelimiter(java.util.regex.Pattern)，useLocale(java.util.Locale)或useRadix(int)調用更改的顯式狀態信息。

用法:

public Scanner reset()

返回值：此函數返回已重置的掃描儀。

以下示例程序旨在說明上述函數：

示例1:

// Java program to illustrate the 
// reset() method of Scanner class 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()); 
  
        // change the locale of this scanner 
        scanner.useLocale(Locale.US); 
  
        // change the radix of this scanner 
        scanner.useRadix(30); 
  
        System.out.println("\nBefore Reset:\n"); 
  
        // print the values before reset 
        System.out.println("Radix: " + scanner.radix()); 
        System.out.println("Locale: " + scanner.locale()); 
  
        // reset 
        scanner.reset(); 
  
        System.out.println("\nAfter Reset:\n"); 
  
        System.out.println("Radix: " + scanner.radix()); 
        System.out.println("Locale: " + scanner.locale()); 
  
        // close the scanner 
        scanner.close(); 
    } 
}

輸出：

Scanner String:
Geeksforgeeks has Scanner Class Methods

Before Reset:

Radix: 30
Locale: en_US

After Reset:

Radix: 10
Locale: en_US

示例2:

// Java program to illustrate the 
// reset() method of Scanner class in Java 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) 
        throws Exception 
    { 
  
        String s = "Geeksforgeeks"; 
  
        // 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()); 
  
        // change the locale of this scanner 
        scanner.useLocale(Locale.US); 
  
        // change the radix of this scanner 
        scanner.useRadix(12); 
  
        System.out.println("\nBefore Reset:\n"); 
  
        // print the values before reset 
        System.out.println("Radix: " + scanner.radix()); 
        System.out.println("Locale: " + scanner.locale()); 
  
        // reset 
        scanner.reset(); 
  
        System.out.println("\nAfter Reset:\n"); 
  
        System.out.println("Radix: " + scanner.radix()); 
        System.out.println("Locale: " + scanner.locale()); 
  
        // close the scanner 
        scanner.close(); 
    } 
}

輸出：

Scanner String:
Geeksforgeeks

Before Reset:

Radix: 12
Locale: en_US

After Reset:

Radix: 10
Locale: en_US

參考： https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#reset()

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