從字符中隨機獲取一個字符，提示用戶輸入數字，或是大寫字母，或是小寫字母,如果用戶猜的數字正確，提示用戶，恭喜你猜對了，否則提示輸入大了或者輸入小了

package day03;

import java.util.Random;

import javax.swing.JOptionPane;

/*1.當輸入的數字與隨機產生的數字相同。提示恭喜你中500萬日元
 2.當輸入的數字小於  提示輸入小
 3.當輸入的數字大了 提示輸入大了
 輸入5次沒有猜中。對不起遊戲結束

 5.如果字母就提示輸入字母 如果數字就提示輸入數字

 8.如果大寫的字母 提示大寫字母
 */
public class GuessNumDemo {

 // 入口方法
 public static void main(String[] args) {
  String str = "123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  // 隨機產生字符
  Random random = new Random();
  String inputChar = "";
  int index = random.nextInt(str.length());
  char guessChar = str.charAt(index);
  //JOptionPane.showMessageDialog(null, guessChar);//用於測試，讓所猜的字符顯示出來，測試程序的正誤

  /*
   * if((guessChar>='1')&&(guessChar<='9')){
   * inputChar=JOptionPane.showInputDialog("請輸入你猜的數字"); }else
   * if(((guessChar
   * >='a')&&(guessChar<='z'))||((guessChar>='A')&&(guessChar<='Z'))){
   * inputChar=JOptionPane.showInputDialog("請輸入你猜的字母"); }
   */

  for (int i = 0; i < 5; i++) {
   if (guessChar >= 49 && guessChar <= 57) {
    inputChar = JOptionPane.showInputDialog("請輸入你猜的數字");
    if (inputChar.charAt(0) >= 49 && inputChar.charAt(0) <= 57) {
     if (inputChar.equals(guessChar + "")) {
      JOptionPane.showMessageDialog(null, "恭喜你中了500萬！");
      break;
     } else {
      if (inputChar.charAt(0) > guessChar) {
       JOptionPane.showMessageDialog(null, "大了！");
      } else if (inputChar.charAt(0) < guessChar) {
       JOptionPane.showMessageDialog(null, "小了！");
      }
     }
    } else {
     JOptionPane.showMessageDialog(null, "輸入錯誤！");
    }
   } else if ((guessChar >= 97 && guessChar <= 122)) {
    inputChar = JOptionPane.showInputDialog("請輸入你猜的小寫字母");
    if (inputChar.charAt(0) >= 97 && inputChar.charAt(0) <= 122) {
     if (inputChar.equals(guessChar + "")) {
      JOptionPane.showMessageDialog(null, "恭喜你中了500萬！");
      break;
     } else {
      if (inputChar.charAt(0) > guessChar) {
       JOptionPane.showMessageDialog(null, "大了！");
      } else if (inputChar.charAt(0) < guessChar) {
       JOptionPane.showMessageDialog(null, "小了！");
      }
     }
    } else {
     JOptionPane.showMessageDialog(null, "輸入錯誤！");
    }
   } else if ((guessChar >= 65 && guessChar <= 90)) {

    inputChar = JOptionPane.showInputDialog("請輸入你猜的大寫字母");
    if (inputChar.charAt(0) >= 65 && inputChar.charAt(0) <= 90) {
     if (inputChar.equals(guessChar + "")) {
      JOptionPane.showMessageDialog(null, "恭喜你中了500萬！");
      break;
     } else {
      if (inputChar.charAt(0) > guessChar) {
       JOptionPane.showMessageDialog(null, "大了！");
      } else if (inputChar.charAt(0) < guessChar) {
       JOptionPane.showMessageDialog(null, "小了！");
      }
     }
    } else {
     JOptionPane.showMessageDialog(null, "輸入錯誤！");
    }
   }
  }
 }
}