ltterrandom1.java

是用来生成测试数据的类

package Random;

/**
 *	该类主要用于生成指定长度的随机大写字母及随机小写字母． 
 * 	@author shif
 * */

public class LtterRandom1{

	public static void main(String args[]) {
		LtterRandom1 letterRandom=new LtterRandom1();
		System.out.println("大写随机字母:"+letterRandom.getUpperLetter(10));
		System.out.println("小写随机字母:"+letterRandom.getLowLtter(10));
	}
	
	public String getUpperLetter(int length)
	{
		char[] cc = new char[length];
		for (int i = 0; i < cc.length; i++) {
			while (cc[i] < 'A' || cc[i] > 'Z')
				cc[i] = (char) (Math.random() * (int) 'Z');
		}
		String str = new String("");

		for (int i = 0; i < cc.length; i++)
			str += cc[i];

		return str;
	}
	
	public String getLowLtter(int length)
	{
		char[] cc = new char[length];
		for (int i = 0; i < cc.length; i++) {
			while (cc[i] < 'a' || cc[i] > 'z')
				cc[i] = (char) (Math.random() * (int) 'z');
		}
		String str = new String("");

		for (int i = 0; i < cc.length; i++)
			str += cc[i];

		return str;
	}
	
	
}