Java Scanner toString()方法及示例
java.util.Scanner 类的 toString() 方法返回该Scanner的字符串表示。确切的格式是没有规定的。
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述函数。
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]
**参考资料: ** https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#toString()