ex030201a.java

我在学习JAVA的讲义

import java.io.*;
public class Ex030201A{
	static char method(char c){
		if (Character.isUpperCase(c)){
			c=Character.toLowerCase(c);
		}
		else if (Character.isLowerCase(c)){
			c=Character.toUpperCase(c);
		}
		return c;
	}
	public static void main(String[] args){
		char c=' ';
		try{
			c=(char)System.in.read();
		}catch (IOException e){}
		System.out.println("Converted: "+method(c));
	}
}