扫描器有 Java 中的 NextShort()方法，示例
原文:https://www . geesforgeks . org/scanner-hasnextshort-method-in-Java-with-examples/
如果这个扫描器的输入中的下一个标记可以被假定为给定基数的短值，那么Java . util . scanner类的 hasNextShort() 方法返回 true。扫描仪不会前进超过任何输入。如果没有基数作为参数传递，函数会将基数解释为默认基数，并相应地运行。
语法:
public boolean hasNextShort(int radix)
or
public boolean hasNextShort()
参数:该函数接受单个参数基数，这不是强制参数。它指定用于将令牌解释为短值的基数。
返回值:当且仅当该扫描器的下一个令牌是默认基数中的有效短值时，该函数返回真。
异常:如果扫描仪关闭，该功能会抛出非法状态异常。
以下程序说明了上述功能:
程序 1:
// Java program to illustrate the
// hasNextShort() method of Scanner class in Java
// with parameter
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
String s = "gfg 2 geeks!";
// new scanner with the
// specified String Object
Scanner scanner = new Scanner(s);
// use US locale to interpret shorts in a string
scanner.useLocale(Locale.US);
// iterate till end
while (scanner.hasNext()) {
// check if the scanner's
// next token is a short with a radix 3
System.out.print("" + scanner.hasNextShort(3));
// print what is scanned
System.out.print(" -> " + scanner.next() + "\n");
}
// close the scanner
scanner.close();
}
}
输出:
false -> gfg
true -> 2
false -> geeks!
程序二:
// Java program to illustrate the
// hasNextShort() method of Scanner class in Java
// without parameter
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
String s = "gfg 2 geeks!";
// new scanner with the
// specified String Object
Scanner scanner = new Scanner(s);
// use US locale to interpret shorts in a string
scanner.useLocale(Locale.US);
// iterate till end
while (scanner.hasNext()) {
// check if the scanner's
// next token is a short with the default radix
System.out.print("" + scanner.hasNextShort());
// print what is scanned
System.out.print(" -> " + scanner.next() + "\n");
}
// close the scanner
scanner.close();
}
}
输出:
false -> gfg
true -> 2
false -> geeks!
程序 3: 程序演示非法状态异常
// Java program to illustrate the
// hasNextShort() method of Scanner class in Java
// Exception case
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "gfg 2 geeks!";
// new scanner with the
// specified String Object
Scanner scanner = new Scanner(s);
// use US locale to interpret shorts in a string
scanner.useLocale(Locale.US);
scanner.close();
// iterate till end
while (scanner.hasNext()) {
// check if the scanner's
// next token is a short with the default radix
System.out.print("" + scanner.hasNextShort());
// print what is scanned
System.out.print(" -> " + scanner.next() + "\n");
}
// close the scanner
scanner.close();
}
catch (IllegalStateException e) {
System.out.println("Exception: " + e);
}
}
}
T5】输出:
Exception: java.lang.IllegalStateException: Scanner closed
参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/scanner . html # hasNextShort()
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