Java中的字符.isLetterOrDigit() 和示例
Java.lang。 字符.isLetterOrDigit(char ch)是Java中的一个内置方法,用于确定指定字符是字母还是数字。
句法:
public static boolean isLetterOrDigit(char ch)
参数:该函数接受一个强制参数ch ,它表示要测试的字符。
返回值:此函数返回一个布尔值。如果字符是字母或数字,则布尔值为true ,否则为false 。
下面的程序说明了上述方法:
方案一:
// Java program to illustrate the
// Character.isLetterOrDigit() method
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
// two characters
char c1 = 'Z', c2 = '2';
// Function to check if the character is letter or digit
boolean bool1 = Character.isLetterOrDigit(c1);
System.out.println(c1 + " is a letter/digit ? " + bool1);
// Function to check if the character is letter or digit
boolean bool2 = Character.isLetterOrDigit(c2);
System.out.println(c2 + " is a letter/digit ? " + bool2);
}
}
输出:
Z is a letter/digit ? true
2 is a letter/digit ? true
方案二:
// Java program to illustrate the
// Character.isLetterOrDigit() method
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
// assign character
char c1 = 'D', c2 = '/';
// Function to check if the character is letter or digit
boolean bool1 = Character.isLetterOrDigit(c1);
System.out.println(c1 + " is a letter/digit ? " + bool1);
// Function to check if the character is letter or digit
boolean bool2 = Character.isLetterOrDigit(c2);
System.out.println(c2 + " is a letter/digit ? " + bool2);
}
}
输出:
D is a letter/digit ? true
/ is a letter/digit ? false
参考: https: Java/lang/ 字符.html#isLetterOrDigit(char)