Java 中 Scanner nextShort()方法，带示例
原文:https://www . geesforgeks . org/scanner-next short-method-in-Java-with-examples/
Java . util . scanner类的 nextShort(基数)方法将输入的下一个标记扫描为 Short。如果翻译成功，扫描仪将通过匹配的输入。如果参数基数没有被传递，那么它的行为类似于 nextShort(基数)，其中基数被假定为默认基数。
语法:
public short nextShort()
参数:函数接受一个参数基数，用于将令牌解释为一个短值。
返回值:该函数返回从输入端扫描的短路。
异常:函数抛出三个异常，如下所述:
- inputismatchexception:如果下一个标记与 Integer 正则表达式不匹配，或者超出范围
- nosucheelementexception:如果输入用尽，抛出
- illegalstatexception:如果扫描仪关闭，则抛出
以下程序说明了上述功能:
程序 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// nextShort() 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 9 + 6 = 12.0";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
while (scanner.hasNext()) {
// if the next is a short,
// print found and the short
if (scanner.hasNextShort()) {
System.out.println("Found Short value :"
+ scanner.nextShort());
}
// if no short is found,
// print "Not Found:" and the token
else {
System.out.println("Not found short value :"
+ scanner.next());
}
}
scanner.close();
}
}
Output:
Not found short value :Gfg
Found Short value :9
Not found short value :+
Found Short value :6
Not found short value :=
Not found short value :12.0
程序 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// nextShort() 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 9 + 6 = 12.0";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
while (scanner.hasNext()) {
// if the next is a short,
// print found and the short
if (scanner.hasNextShort()) {
System.out.println("Found Short value :"
+ scanner.nextShort(12));
}
// if no short is found,
// print "Not Found:" and the token
else {
System.out.println("Not found short value :"
+ scanner.next());
}
}
scanner.close();
}
}
Output:
Not found short value :Gfg
Found Short value :9
Not found short value :+
Found Short value :6
Not found short value :=
Not found short value :12.0
程序 3: 演示 InputMismatchException
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// nextShort() method of Scanner class in Java
// InputMismatchException
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Gfg 9 + 6 = 12.0";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
while (scanner.hasNext()) {
// if the next is a short,
// print found and the short
// since the value 60 is out of range
// it throws an exception
System.out.println("Next Short value :"
+ scanner.nextShort());
}
scanner.close();
}
catch (Exception e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
Exception thrown: java.util.InputMismatchException
程序 4: 演示 NoSuchElementException
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// nextShort() method of Scanner class in Java
// NoSuchElementException
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Gfg";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
// Trying to get the next short value
// more times than the scanner
// Hence it will throw exception
for (int i = 0; i < 5; i++) {
// if the next is a short,
// print found and the short
if (scanner.hasNextShort()) {
System.out.println("Found Short value :"
+ scanner.nextShort());
}
// if no short is found,
// print "Not Found:" and the token
else {
System.out.println("Not found short value :"
+ scanner.next());
}
}
scanner.close();
}
catch (Exception e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
Not found short value :Gfg
Exception thrown: java.util.NoSuchElementException
程序 5: 演示非法状态异常
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// nextShort() method of Scanner class in Java
// IllegalStateException
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Gfg 9 + 6 = 12.0";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
// close the scanner
scanner.close();
System.out.println("Scanner Closed");
System.out.println("Trying to get "
+ "next Short value");
while (scanner.hasNext()) {
// if the next is a short,
// print found and the short
if (scanner.hasNextShort()) {
System.out.println("Found Short value :"
+ scanner.nextShort());
}
// if no short is found,
// print "Not Found:" and the token
else {
System.out.println("Not found short value :"
+ scanner.next());
}
}
}
catch (Exception e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
Scanner Closed
Trying to get next Short value
Exception thrown: java.lang.IllegalStateException: Scanner closed
参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/scanner . html # nextShort()
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