javase_生成指定区间的任意整数_字母

 

 

 

 

 

public class Test {

	/**
	 * (int)(rmd*(max - min + 1) + min) ;   [min,max]
	 */
	public static void main(String[] args) {
		
		new Thread(new Runnable(){
			@Override
			public void run() {
				while(true) {
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					generateNum();
					//generateZIMU();
				}
			}
			
		}).start();
		
		
	}
    // 生成 [1,12]
	private static void generateNum() {
		double rmd = Math.random(); 
		int num = (int)(rmd*(12-1+1)  + 1); 
		System.out.println(num);
	}
	
	// 生成24个小写字母
	private static void generateZIMU() {
		double rmd = Math.random(); 
		char num = (char)(rmd*('z'-'a'+1) + 'a') ; 
		System.out.println(num);
	}
	
	

}