char c = 'a';
int asciiValue = (int) c;
System.out.println(asciiValue); // 輸出: 97
char c = 'A';
int asciiValue = Character.getNumericValue(c);
System.out.println(asciiValue); // 輸出: 10
Copy code
char c = '0';
int asciiValue = c - '0';
System.out.println(asciiValue); // 輸出: 0