Question

java编程 软件eclipse 利用面向对象的思想编写程序，实现生成一随机字母（a~z,A~Z），并输出。

Answer 1

class A{
	public String getRandomLetter(){
		String a[] = {"a","b","c","d","e","f",
					"g","h","i","j","k","l",
					"m","n","o","p","q","r",
					"s","t","u","v","w","x",
					"y","z","A","B","C","D",
					"E","F","G","H","I","J",
					"K","L","M","N","O","P",
					"Q","R","S","T","U","V",
					"W","X","Y","Z"};
		Random random = new Random();
		int max = 51, min = 0;
		//得0-51范围内的随机数
        int i = random.nextInt(max)%(max-min+1) + min;
		return a[i];
	}
}

class Test{
	public static void main(String[] args)	{
		A a = new A();
		System.out.println(a.getRandomLetter());
	}
}

追问

有错误的你在看看

追答

用记事本写的，你错误截一下

追问

追答

package test;

import java.util.Random;

class A{
    public String getRandomLetter(){
        String a[] = {"a","b","c","d","e","f",
                    "g","h","i","j","k","l",
                    "m","n","o","p","q","r",
                    "s","t","u","v","w","x",
                    "y","z","A","B","C","D",
                    "E","F","G","H","I","J",
                    "K","L","M","N","O","P",
                    "Q","R","S","T","U","V",
                    "W","X","Y","Z"};
        Random random = new Random();
        int max = 51, min = 0;
        //得0-51范围内的随机数
        int i = random.nextInt(max)%(max-min+1) + min;
        return a[i];
    }
}
public class Test3 {

/**
 * @param args
 */
public static void main(String[] args) {
A a = new A();
        System.out.println(a.getRandomLetter());
}

}

追问

很难受

Answer 2

 String KeyString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    StringBuffer sb = new StringBuffer();
    int len = KeyString.length();
    for (int i = 0; i < length; i++) {
       sb.append(KeyString.charAt((int) Math.round(Math.random() * (len - 1))));
    }
    return sb.toString();

追问

追答

public class Main {
public static void main(String args[]) {
    String KeyString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
      StringBuffer sb = new StringBuffer();
      int len = KeyString.length();
      Random rand = new Random();
      int randNum = rand.nextInt(len);
          
      sb.append(KeyString.charAt(randNum));

     System.out.print(sb.toString());
}
}