基本数据类型及操作[1]1

ESSAGE);Р?}Р}Р3、Рimport javax.swing.JOptionPane;Рpublic class ConvertUpperToLowerР{Р?public static void main(String[] args)Р?{Р?char upperChar = 'B';?Р?char lowerChar = (char)(upperChar+32);?Р?JOptionPane.showMessageDialog(null,"大写字母为:"+upperChar+"\n其对应的小写字母为:Р"+lowerChar,"将大写字母转换为小写字母",JOptionPane.INFORMATION_MESSAGE);Р?}Р}Р4、Рimport javax.swing.JOptionPane;Рpublic class SumР{Р?public static void main(String[] args)Р?{?Р String s = JOptionPane.showInputDialog(null,"请输入一个整数(0-999)","求一Р个整数的各个位数和",JOptionPane.QUESTION_MESSAGE);Р int intValue = Integer.parseInt(s);Р int i1 = intValue/100;Р int i2 = intValue/10;Р int i3 = intValue - i2*10 - i1*100;Р int sum = i1+i2+i3;Р JOptionPane.showMessageDialog(null,"整数为:"+intValue+"\n各位之和为: Р"+sum,"求一个整数的各个位数和",JOptionPane.INFORMATION_MESSAGE);Р?}Р}Р思考: