java Java 中的 Scanner toString()方法，带示例

Java 中的 Scanner toString()方法，带示例

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

Java . util . Scanner类的 toString() 方法返回该 Scanner 的字符串表示形式。未指定确切的格式。

语法:

public String toString()

返回值:该函数返回该扫描仪的字符串表示。

下面的程序说明了上面的功能:

程序 1:

// Java program to illustrate the
// toString() method of Scanner class in Java

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        String s = "GeeksForGeeks - "
                   + "A Computer Science Portal for Geeks";

        // 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 information about this scanner
        System.out.println("\nString representation "
                           + "of this Scanner:\n"
                           + scanner.toString());

        // close the scanner
        scanner.close();
    }
}

输出:

Scanner String: 
GeeksForGeeks - A Computer Science Portal for Geeks

String representation of this Scanner:
java.util.Scanner[delimiters=\p{javaWhitespace}+]
[position=51][match valid=true][need input=false]
[skipped=false][group separator=\,]
[decimal separator=\.][positive prefix=]
[negative prefix=\Q-\E][positive suffix=]
[negative suffix=][NaN string=\Q?\E][infinity string=\Q?\E]