摘要： 二、Java编程与程序运行结果 1.Java编程,打印昨天的当前时刻public class YesterdayCurrent{ public void main(String[] args){ Calendar cal = Calendar.getInstance(); cal.add(Calendar.DATE, -1); System.out.println(cal.getTime()); }} 2.文件读写,实现一个计数器 public int getNum(){ int i = -1; try{ String stri=""; BufferedReader in 阅读全文