Java Scanner useDelimiter()用法及代码示例

useDelimiter(Pattern pattern)

java.util.Scanner类的useDelimiter(Pattern pattern)方法将此扫描程序的定界模式设置为指定的模式。

用法:

public Scanner useDelimiter(Pattern pattern)

参数：该函数接受一个强制性的参数模式，该模式指定一个定界模式。

返回值：函数返回此扫描仪。

以下示例程序旨在说明上述函数：

示例1:

// Java program to illustrate the useDelimiter() 
// method of Scanner class in Java 
  
import java.util.*; 
import java.util.regex.Pattern; 
  
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()); 
  
        // display the old delimiter 
        System.out.println("Old delimiter: "
                           + scanner.delimiter()); 
  
        // change the delimiter of this scanner 
        scanner.useDelimiter(Pattern.compile(".ll.")); 
  
        // display the new delimiter 
        System.out.println("New delimiter: "
                           + scanner.delimiter()); 
  
        // close the scanner 
        scanner.close(); 
    } 
}

输出：

Scanner String: 
Geeksforgeeks has Scanner Class Methods
Old delimiter: \p{javaWhitespace}+
New delimiter: .ll.

useDelimiter(String pattern)

java.util.Scanner类的useDelimiter(String pattern)方法将此扫描仪的定界模式设置为从指定String构造的模式。

用法:

public Scanner useDelimiter(String pattern)

参数：该函数接受强制性的参数字符串模式，该模式指定了定界模式。

返回值：函数返回此扫描仪。

以下示例程序旨在说明上述函数：

示例1:

// Java program to illustrate the useDelimter() 
// 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()); 
  
        // print the old delimiter 
        System.out.println("Old Delimiter: "
                           + scanner.delimiter()); 
  
        // change the delimiter 
        scanner.useDelimiter("Wor"); 
  
        // print the new delimiter 
        System.out.println("New Delimiter: "
                           + scanner.delimiter()); 
  
        // close the scanner 
        scanner.close(); 
    } 
}

输出：

Scanner String: 
Geeksforgeeks has Scanner Class Methods
Old Delimiter: \p{javaWhitespace}+
New Delimiter: Wor

参考： https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#useDelimiter(java.lang.String)

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 Scanner useDelimiter() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。