1、字符串数组与字符串之间的转换 一个字符串可以变为一个字符 数组,同样,也可以把一个字符数组,变为一个字符串。 在String类中提供了以下操作方法: 将字符串变为字符…
import java.sql.Timestamp; import java.text.DateFormat; import java.text.ParseException; i…
/*实现图片倒影(tested)*/ public class ButtonImageActivity extends Activity { /** Called when the…
/** 日期类 * @version 1.0 */ import java.util.*; import java.text.*; import java.util.Calenda…
Zxing是Google提供的关于条码(一维码、二维码)的解析工具,提供了二维码的生成与解析的方法,现在我简单介绍一下使用Java利用Zxing生成与解析二维码 Zxing项目地址…
import java.io.UnsupportedEncodingException; import java.security.InvalidKeyException; imp…
1.加入权限 在manifest.xml文件中要添加 import android.app.Activity; import android.os.Bundle; im…
可以计算带括号的表达式,不过前提是:正确的表达式才行 package com.fire.utils; import java.text.DecimalFormat; import …
1. 使用MySQL建立一个test数据库,里面建立一个mytable表,3列(id,name,age);将url, user, password配制成properties文件,放…
static class Tree { private Node root; public Node getRoot() { return root; } public void …
正则表达式概念 正则表达式使用单个字符串来描述、匹配一系列符合某个句法规则的字符串。正则表达式可以用形式化语言理论的方式来表达,它由常量和算子组成,它们分别指示字符串的…
import java.util.EmptyStackException; import java.util.Stack; public class CaculateFunctio…
Java实现的utf8,gbk,unicode编码相互转换的代码
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