扫描仪类toString()方法 (Scanner Class toString() method)

• toString() method is available in java.util package.

  toString()方法在java.util包中可用。

• toString() method is used to string denotation of this Scanner and it contains information related to tracing.

  toString()方法用于对此扫描程序进行字符串表示，并且包含与跟踪有关的信息。

• toString() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  toString()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• toString() method does not throw an exception at the time of string denotation of this Scanner.

  在此扫描程序的字符串表示形式时， toString()方法不会引发异常。

Syntax:

句法：

public String toString();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is String, it returns string representation of this Scanner.

该方法的返回类型为String ，它返回此Scanner的字符串表示形式。

Example:

例：

// Java program to demonstrate the example // of String toString() method of Scanner import java.util.*;public class ToStringOfScanner {
       public static void main(String[] args) {
           String str = "Hi, true \n IncludeHelp! 8 + 2.0f = 10.0f";        // Instantiate Scanner with the         // given str        Scanner sc = new Scanner(str);        // Display Scanner        System.out.println("sc.nextLine(): " + sc.nextLine());        // By using toString() method is to        // represent string for this Scanner        System.out.println("sc.toString(): " + sc.toString());        // close the scanner        sc.close();    }}

Output

输出量

sc.nextLine(): Hi, true sc.toString(): java.util.Scanner[delimiters=\p{javaWhitespace}+][position=10][match valid=true][need input=false][source closed=false][skipped=false][group separator=\,][decimal separator=\.][positive prefix=][negative prefix=\Q-\E][positive suffix=][negative suffix=][NaN string=\QNaN\E][infinity string=\Q∞\E]

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