Java 中 Scanner findInLine()方法，带示例

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

查找内嵌(模式模式)

Java . util . scanner类的find inline(Pattern Pattern)方法尝试忽略分隔符查找指定模式的下一个匹配项。如果在下一个行分隔符之前找到了模式，扫描仪将前进到匹配的输入，并返回与模式匹配的字符串。如果在直到下一行分隔符的输入中没有检测到这样的模式，则返回 null，扫描仪的位置不变。

语法:

public String findInLine(Pattern pattern)

参数:该功能接受强制参数“图案”图案，即扫描的图案。

返回值:该函数返回扫描仪的定界模式。

异常:如果扫描仪关闭，该功能将抛出非法状态异常。

以下程序说明了上述功能:

程序 1:

// Java program to illustrate the
// findInLine() 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
    {

        try {

            // Get the string to be searched
            String s = "Geeksforgeeks has Scanner Class Methods";

            // Print the string
            System.out.println("Target String:\n" + s);

            // create a new scanner
            // with the specified String Object
            Scanner scanner = new Scanner(s);

            // finds a pattern of any 5 letter plus "for"
            System.out.println("\nAny 5 letter plus for : "
                               + scanner.findInLine(
                                     Pattern.compile(".....for")));

            // close the scanner
            scanner.close();
        }
        catch (IllegalStateException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Target String:
Geeksforgeeks has Scanner Class Methods

Any 5 letter plus for : Geeksfor

程序 2: 演示非法状态异常

// Java program to illustrate the
// findInLine() 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
    {

        try {

            // Get the string to be searched
            String s = "Geeksforgeeks has Scanner Class Methods";

            // Print the string
            System.out.println("Target String:\n" + s);

            // create a new scanner
            // with the specified String Object
            Scanner scanner = new Scanner(s);

            // close the scanner
            scanner.close();

            // finds a pattern of any 5 letter plus "for"
            System.out.println("\nAny 5 letter plus for : "
                               + scanner.findInLine(
                                     Pattern.compile(".....for")));

            // print the next line of the string
            System.out.println("" + scanner.nextLine());
        }
        catch (IllegalStateException e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

Target String:
Geeksforgeeks has Scanner Class Methods
Exception thrown:
 java.lang.IllegalStateException:
 Scanner closed

查找内联(字符串模式)

Java . util . scanner类的find inline(String pattern)方法尝试查找由指定字符串模式构造的模式的下一个匹配项，忽略分隔符。

语法:

public String findInLine(String pattern)

参数:该功能接受扫描的强制参数字符串模式。

返回值:该函数返回扫描仪的定界模式。

异常:如果扫描仪关闭，该功能将抛出非法状态异常。

以下程序说明了上述功能:

程序 1:

// Java program to illustrate the
// findInLine() 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
    {

        try {

            // Get the string to be searched
            String s = "Geeksforgeeks has Scanner Class Methods";

            // Print the string
            System.out.println("Target String:\n" + s);

            // create a new scanner
            // with the specified String Object
            Scanner scanner = new Scanner(s);

            // finds a pattern of any 5 letter plus "for"
            System.out.println("\nAny 5 letter plus for : "
                               + scanner.findInLine(
                                     Pattern.compile(".....for")));

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

        catch (IllegalStateException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Target String:
Geeksforgeeks has Scanner Class Methods

Any 5 letter plus for : Geeksfor

程序 2: 演示非法状态异常

// Java program to illustrate the
// findInLine() 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
    {

        try {

            // Get the string to be searched
            String s = "Geeksforgeeks has Scanner Class Methods";

            // Print the string
            System.out.println("Target String:\n" + s);

            // create a new scanner
            // with the specified String Object
            Scanner scanner = new Scanner(s);

            // close the scanner
            scanner.close();

            // finds a pattern of any 5 letter plus "for"
            System.out.println("\nAny 5 letter plus for : "
                               + scanner.findInLine(
                                     Pattern.compile(".....for")));
        }

        catch (IllegalStateException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Target String:
Geeksforgeeks has Scanner Class Methods
Exception thrown :
 java.lang.IllegalStateException:
 Scanner closed

参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/scanner . html # find inline(Java . util . regex . pattern)

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