day19/ExceptionInfo.java

import java.io.*;import java.util.*;import java.text.*;class ExceptionInfo {public static void main(String[] args) //throws IOException{try{int[] arr = new int[2];System.out.println(arr[3]);}catch (Exception e){try{Date d = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm-ss");String s = sdf.format(d);PrintStream ps = new PrintStream("exception.log");ps.println(s);System.setOut(ps);}catch (IOException ex){throw new RuntimeException("日志文件创建失败");}e.printStackTrace(System.out);}}}