如果可以使用nextBigDecimal()方法將此掃描儀輸入中的下一個標記解釋為BigDecimal,則java.util.Scanner類的hasNextBigDecimal()方法將返回true。掃描儀不會越過任何輸入。
用法:
public boolean hasNextBigDecimal()
參數:該函數不接受任何參數。
返回值:僅當此掃描儀的下一個令牌是有效的BigDecimal時,此函數才返回true。
異常注意:如果關閉此掃描器,則此函數將引發IllegalStateException。
以下示例程序旨在說明上述函數:
示例1:
// Java program to illustrate the
// hasNextBigDecimal() 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 BigDecimals in a string
scanner.useLocale(Locale.US);
// iterate till end
while (scanner.hasNext()) {
// check if the scanner's
// next token is a BigDecimal with the default radix
System.out.print("" + scanner.hasNextBigDecimal());
// print what is scanned
System.out.print(" -> " + scanner.next() + "\n");
}
// close the scanner
scanner.close();
}
}
輸出:
false -> gfg true -> 2 false -> geeks!
示例2:演示異常的程序
// Java program to illustrate the
// hasNextBigDecimal() 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 BigDecimals in a string
scanner.useLocale(Locale.US);
scanner.close();
// iterate till end
while (scanner.hasNext()) {
// check if the scanner's
// next token is a BigDecimal with the default radix
System.out.print("" + scanner.hasNextBigDecimal());
// print what is scanned
System.out.print(" -> " + scanner.next() + "\n");
}
// close the scanner
scanner.close();
}
catch (IllegalStateException e) {
System.out.println("Exception: " + e);
}
}
}
輸出:
Exception: java.lang.IllegalStateException: Scanner closed
參考: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#hasNextBigDecimal()
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注:本文由純淨天空篩選整理自gopaldave大神的英文原創作品 Scanner hasNextBigDecimal() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。