我写了个类MyRandom,返回(min-max]间的一个数(对应字母ascii码值).
然后在主程序里生成一个Random对象,
如果为1就随机生成(0-9),2生成a-z,3生成A-Z
这样达到随机生成数字和字母的效果,
各位大哥门还有别的好方法吗?
各位大哥门还有别的好方法吗?
我的代码如下,新手,很少写东西.呵呵,惭愧.大家多指教
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import java.util.Random;
class MyRandom{
private int max;
private int min;
private int num;
private int tmp;
Random rMax = new Random();
Random rMin = new Random();
public MyRandom(int min, int max) {
this.max = max;
this.min = min;
}
public int getNum() {
do{
num = rMax.nextInt(max);
}
while (num < min);
return num;
} // end ranNum
} // end class
public class Test {
public static void main(String[] args) {
String s;
// 数字和大、小写字母分布的3个区域
MyRandom random1 = new MyRandom(48, 57);
MyRandom random2 = new MyRandom(65, 90);
MyRandom random3 = new MyRandom(97, 122);
// 随机选择进入这三个区域
Random ranTmp = new Random();
int tmp = 0;
byte[] b = new byte[15];
for(int i = 0 ; i < 15; i++ ){
tmp = ranTmp.nextInt(3);
switch(tmp) {
case 0:
b[i] = (byte)random1.getNum();
break;
case 1:
b[i] = (byte)random2.getNum();
break;
case 2:
b[i] = (byte)random3.getNum();
break;
}
System.out.print(b[i] + " ");
} // end for
s = new String(b);
System.out.print(s);
} // end main
} // end Test
