a-zA-Z0-9的字符取值范围测试代码

package com.xiaoa;

/**
 * @author niyite
 *
 */
/*
 * A:65
 * a:97
 * 0:48
 */
public class Demo {
    public static void main(String[] args) {
        System.out.println('A'*1);
        char c = (char) ('A'+'a');
        System.out.println(c);
        System.out.println((char) ('A'+'a'));
        System.out.println('A'-0);
        System.out.println('a'-0);
        System.out.println('0'-0);
        
    }
}