Java 中扫描仪复位()方法，示例

原文:https://www . geesforgeks . org/scanner-reset-method-in-Java-with-examples/

Java . util . scanner类的 reset() 方法重置此扫描仪。在重置扫描仪时，它会丢弃所有的显式状态信息，这些信息可能已经通过调用useDelimiter(Java . util . regex . pattern)、useLocale(java.util.Locale)或 useRadix(int)而改变。

语法:

public Scanner reset()

返回值:该功能返回已复位的扫描仪。

以下程序说明了上述功能:

程序 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();
    }
}

输出:

Scanner String:
Geeksforgeeks has Scanner Class Methods

Before Reset:

Radix: 30
Locale: en_US

After Reset:

Radix: 10
Locale: en_US

程序二:

// 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();
    }
}

输出:

Scanner String:
Geeksforgeeks

Before Reset:

Radix: 12
Locale: en_US

After Reset:

Radix: 10
Locale: en_US

参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/scanner . html # reset()

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