Java 中的 Scanner skip()方法，示例
原文:https://www . geesforgeks . org/scanner-skip-method-in-Java-with-examples/
跳过(模式模式)
Java . util . scanner类的 skip(Pattern pattern) 方法跳过与指定模式匹配的输入，忽略分隔符。如果指定模式的锚定匹配成功，函数将跳过输入。
语法:
public Scanner skip(Pattern pattern)
参数:该函数接受一个强制参数模式，它指定一个字符串作为要跳过的模式。
返回值:该函数返回该扫描仪
异常:此方法抛出以下异常:
- [T0】 nosucheelementexception 【T1]: When the specified pattern is not found.
- 非法状态异常:-你好-你好
以下程序说明了上述功能:
程序 1:
// Java program to illustrate the
// skip() 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 - "
+ "A Computer Science Portal for Geeks";
System.out.println("String trying to get input:\n"
+ s);
// create a new scanner with
// the specified String Object
Scanner scanner = new Scanner(s);
// skip the word that
// matches with the pattern ..eks
System.out.println("Skipping 5 letter words"
+ " that ends with 'eks'\n");
scanner.skip(Pattern.compile("..eks"));
// print a line of the scanner
System.out.println("Input Scanner String: \n"
+ scanner.nextLine());
// close the scanner
scanner.close();
}
}
输出:
String trying to get input:
GeeksForGeeks - A Computer Science Portal for Geeks
Skipping 5 letter words that ends with 'eks'
Input Scanner String:
ForGeeks - A Computer Science Portal for Geeks
程序 2: 演示 nosucheelementexception
// Java program to illustrate the
// skip() 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 {
String s = "GeeksForGeeks - "
+ "A Computer Science Portal for Geeks";
System.out.println("String trying to get input:\n"
+ s);
// create a new scanner with
// the specified String Object
Scanner scanner = new Scanner(s);
// skip the word that
// matches with the pattern and
System.out.println("Skipping 3 letter words"
+ " and\n");
scanner.skip(Pattern.compile("and"));
// print a line of the scanner
System.out.println("Input Scanner String: \n"
+ scanner.nextLine());
// close the scanner
scanner.close();
}
catch (Exception e) {
System.out.println("Exception thrown: " + e);
}
}
}
输出:
String trying to get input:
GeeksForGeeks - A Computer Science Portal for Geeks
Skipping 3 letter words and
Exception thrown: java.util.NoSuchElementException
程序 3: 演示非法状态异常
// Java program to illustrate the
// skip() 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 {
String s = "GeeksForGeeks - "
+ "A Computer Science Portal for Geeks";
System.out.println("String trying to get input:\n"
+ s);
// create a new scanner with
// the specified String Object
Scanner scanner = new Scanner(s);
// close the scanner
scanner.close();
System.out.println("Scanner Closed");
// skip the word that
// matches with the pattern and
System.out.println("Trying to Skip 3 letter words"
+ " and\n");
scanner.skip(Pattern.compile("and"));
// print a line of the scanner
System.out.println("Input Scanner String: \n"
+ scanner.nextLine());
}
catch (Exception e) {
System.out.println("Exception thrown: " + e);
}
}
}
输出:
String trying to get input:
GeeksForGeeks - A Computer Science Portal for Geeks
Scanner Closed
Trying to Skip 3 letter words and
Exception thrown: java.lang.IllegalStateException: Scanner closed
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