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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>1.4. 类型</title><link rel="stylesheet" type="text/css" href="..//docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="../index.html" title="Netkiller Java 手札" /><link rel="up" href="index.html" title="第 1 章 Java" /><link rel="prev" href="properties.html" title="1.3. Properties" /><link rel="next" href="network.html" title="1.5. Network" /></head><body><a xmlns="" href="http://www.netkiller.cn/">Home</a> |
<a xmlns="" href="http://netkiller.github.io/">简体中文</a> |
<a xmlns="" href="http://netkiller.sourceforge.net/">繁体中文</a> |
<a xmlns="" href="/journal/index.html">杂文</a> |
<a xmlns="" href="/search.html">Search</a> |
<a xmlns="" href="http://netkiller-github-com.iteye.com/">ITEYE 博客</a> |
<a xmlns="" href="http://my.oschina.net/neochen/">OSChina 博客</a> |
<a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> |
<a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> |
<a xmlns="" href="https://zb.oschina.net/profile/725072/market">作品与服务</a> |
<a xmlns="" href="mailto:[email protected]">Email</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.4. 类型</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="properties.html">上一页</a> </td><th width="60%" align="center">第 1 章 Java</th><td width="20%" align="right"> <a accesskey="n" href="network.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="http://ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="http://ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="http://ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="type"></a>1.4. 类型</h2></div></div></div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="string"></a>1.4.1. String 处理</h3></div></div></div>
<pre class="programlisting">
{"status":0,"message":"","bankcode":"ABOC;IBC;CCTB;ICBC"}
转换后
{\"status\":0,\"message\":\"\",\"bankcode\":\"ABOC;IBC;CCTB;ICBC\"}
</pre>
<pre class="programlisting">
package test;
public class str {
public static void main(String[] args) {
String jsonString = "{\"status\":0,\"message\":\"\",\"bankcode\":\"ABOC;IBC;CCTB;ICBC\"}";
System.out.println(jsonString);
System.out.println(jsonString.replace("\"", "\\\""));
}
}
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="arraylist"></a>1.4.2. ArrayList</h3></div></div></div>
<p>判断元素是否存在</p>
<pre class="programlisting">
import java.util.ArrayList;
public class arraylist {
public static void main(String[] args) {
// TODO Auto-generated method stub
ArrayList<String> whitelist = new ArrayList<String>();
whitelist.add("Neo");
whitelist.add("Jam");
whitelist.add("Sam");
if (whitelist.contains("Neo")) {
System.out.println("Found!");
}else{
System.out.println("Not Found!");
}
}
}
</pre>
<pre class="programlisting">
package cn.netkiller.type;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ArrayListExample {
public static void main(String[] args) {
// TODO Auto-generated method stub
List<String> list = new ArrayList<String>();
list.add("Jack");
list.add("Jet");
list.add("Jack");
list.add("Mike");
list.add("Kitty");
list.add("Tom");
//while 循环
Iterator<String> it = list.iterator();
while (it.hasNext()) {
System.out.println(it.next());
}
for (Iterator<String> it1 = list.iterator(); it1.hasNext();) {
System.out.println(it1.next());
}
// for 循环
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
// for 循环加强版
for (String i : list) {
System.out.println(i);
}
}
}
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm45656223800416"></a>1.4.3. String to Array</h3></div></div></div>
<pre class="programlisting">
package cn.netkiller.java;
public class StringToArray {
public static void main(String[] args) {
// TODO Auto-generated method stub
String str="a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
String[] array = null;
array = str.split(",");
for(int i=0; i<array.length; i++){
System.out.println(array[i]);
}
}
}
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm45656223798768"></a>1.4.4. Array to String</h3></div></div></div>
<pre class="programlisting">
package cn.netkiller.java;
import java.util.Arrays;
public class ArrayToString {
public static void main(String[] args) {
String[] array = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};
System.out.println(Arrays.toString(array));
System.out.println(Arrays.toString(array).replaceAll(", |\\[|\\]", ""));
}
}
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm45656223796960"></a>1.4.5. string to timestamp</h3></div></div></div>
<p>Timestamp转化为String:</p>
<pre class="programlisting">
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //定义格式，不显示毫秒
Timestamp now = new Timestamp(System.currentTimeMillis()); //获取系统当前时间
String str = df.format(now);
</pre>
<p>String转化为Timestamp:</p>
<pre class="programlisting">
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = df.format(new Date());
Timestamp ts = Timestamp.valueOf(time);
</pre>
</div>
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