测试杂项

package com;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

class TStatic {
 static int i;
 static Map<String, String> mapShare = new HashMap<String, String>();

 public TStatic() {
  i = 4;
 }

 public TStatic(int j) {
  i = j;
 }

 public static void main(String args[]) {
  /*
   * TStatic t = new TStatic(5); //声明对象引用，并实例化 TStatic tt = new TStatic();
   * //同上 System.out.println(t.i); System.out.println(tt.i);
   * System.out.println(t.i);
   */
  SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 设置日期格式
  String time = df.format(new Date());
  System.out.println(df.format(new Date()));// new Date()为获取当前系统时间
  for (int i = 0; i < 10; i++) {
   if (mapShare.containsKey(String.valueOf(i))) {
    System.out.println("包括");
   } else {
    System.out.println("不包括");
    mapShare.put(String.valueOf(i), time);
    break;
   }

  }

  Set<String> key = mapShare.keySet();
  for (Iterator it = key.iterator(); it.hasNext();) {
   String s = (String) it.next();
   System.out.println(mapShare.get(s));
  }

  FileInputStream fis = null;
  FileOutputStream fos = null;
  try {
   fis = new FileInputStream("C:/temp/ww.jpg");
   byte[] b = new byte[128];
   fos = new FileOutputStream("C:/temp/ww 复件.jpg");
   while (fis.read(b) != -1) {
    fos.write(b);
   }
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   try {
    if (fis != null)
     fis.close();
    if (fos != null)
     fos.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }

 }

}