Java 中的 Scanner useRadix()方法，带示例
原文:https://www . geesforgeks . org/scanner-user adix-method-in-Java-with-examples/
Java . util . scanner类的 useRadix(基数)方法将该扫描仪的默认基数设置为指定基数。扫描仪的基数会影响与正则表达式匹配的默认数字的元素。
语法:
public Scanner useRadix(int radix)
参数:该函数接受一个强制参数基数，该参数指定扫描数字时使用的基数。
返回值:函数返回这个扫描仪对象。
例外:如果基数小于字符。最小基数或大于字符。MAX_RADIX ，则抛出 IllegalArgumentException 。
以下程序说明了上述功能:
程序 1:
// Java program to illustrate the
// useRadix() method of Scanner class in Java
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Geeksforgeeks has Scanner Class Methods";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
// print the line of the scanner
System.out.println("String:\n"
+ scanner.nextLine());
// display the Old radix
System.out.println("\nOld Radix: "
+ scanner.radix());
// change the radix
// of the scanner to 12
scanner.useRadix(12);
// display the new radix
System.out.println("\nNew Radix: "
+ scanner.radix());
// close the scanner
scanner.close();
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
String:
Geeksforgeeks has Scanner Class Methods
Old Radix: 10
New Radix: 12
程序二:异常演示
// Java program to illustrate the
// useRadix() method of Scanner class in Java
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Geeksforgeeks has Scanner Class Methods";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
// print the line of the scanner
System.out.println("String:\n"
+ scanner.nextLine());
// display the Old radix
System.out.println("\nOld Radix: "
+ scanner.radix());
// change the radix
// of the scanner to 64
scanner.useRadix(64);
// display the new radix
System.out.println("\nNew Radix: "
+ scanner.radix());
// close the scanner
scanner.close();
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
String:
Geeksforgeeks has Scanner Class Methods
Old Radix: 10
Exception thrown : java.lang.IllegalArgumentException: radix:64
参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/scanner . html # useRadix(int)
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