standalone
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月光杯：
问题解决了吗？
Exceptions in HDFS -
iostreamin：
神，好厉害，这是我找到的唯一可以ac的Java代码，厉害。
[leetcode] word ladder II -
standalone：
One answer I agree with:引用Whene ...
How many string objects are created? -
DiaoCow：
不错！，一开始对这些确实容易犯迷糊
erlang中的冒号 分号 和 句号 -
standalone：
Exception in thread "main& ...
one java interview question
文章列表
在target/rat.txt下面寻找哪些文件前面打了问号，去掉这些文件！
q// is generally the same thing as using single quotes - meaning it doesn't interpolate values inside the delimiters.
qq// is the same as double quoting a string. It interpolates.
qw// return a list of white space delimited words. @q = qw/this is a test/ is functionally the same as @q = ('this', 'is' ...
export PS1='\[\e[1;0m\][\[\e[38;5;174m\]\u\[\e[38;5;240m\]@\[\e[01;32m\]\h\[\e[38;5;222m\] \w\[\e[31m\]$(parse_git_branch "(%s)")\[\e[1;0m\]]\[\e[38;5;240m\]\$\[\e[1;0m\]\e[m'
function parse_git_branch {
ref=$(git-symbolic-ref HEAD 2> /dev/null) || return
echo "("${ref ...
git alias:
lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative
一段时间不用java，这些概念就全混淆了，有必要彻底澄清一下，总结在这里，当然以我的本事，不太可能写出水平较高的总结，这里主要是总结stackoverflow上面高人的言论。
先说sleep() 和 wait()
sleep() method causes the current thread to move from running state to block state for a specified time. If the current thread has the lock of any object then it keeps holding it, which means ...
shell字符串截取
- 博客分类：
- shell
${string#substring} 从string左边去掉第一个substring
${string%substring} 从string右边去掉第一个substring
本人安装的是oracle java6
1. 下载jre
wget --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F" http://download.oracle.com/otn-pub/java/jdk/6u45-b06/jre-6u45-linux-x64.bin
2. 下载jdk
wget --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F" http://down ...
1. 安装语言包
System Settings-->Language Support-->Install/Remove Languages => 安装Chinese（simplified）
2. 安装IBus框架
sudo apt-get install ibus ibus-clutter ibus-gtk ibus-gtk3 ibus-qt4
3. 启动IBus框架
im-switch -s ibus
4. 注销系统
保证更改立即生效。
5. 设置IBus框架
ibus-setup
IBus Preference设置被打开。在Input Method选项卡中，选择输入法即可 ...
OO
Test
Other reasons?
http://docs.oracle.com/javase/6/docs/technotes/tools/solaris/serialver.html
Today in a small project I need to serialize a perl class object to string in order to cache it. And when getting back the value from the cache I need to deserialize it to original class objects.
There are good articles on the solutions:
http://www.ohmpie.com/serialization/
http://www.onperl.net/ ...
可能我太土了，才发现下面这个命令！
mkdir -p src/{test,main}/{java,resources}
1： 如果子类中的方法的参数是父类的方法的子类型，那么算不算override？
例如：
class A {
public void foo(A a){
}
}
class B extends A {
public void foo(B b){
}
}
2：如果子类中的方法的返回类型改变了，那么算不算override？
class A {
public A foo(A a){
return a;
}
}
class B extends A {
public B foo(B b){
return b;
}
}
There is an ...
This is a very common java interview question.
Given the following:
String x = new String("xyz");
y="abc";
x=x+y;
How Many Strings have been created:
A - 2
B - 3
C - 4
D - 5
To answer this question, I suggest you to read
http://www.javaranch.com/journal/200409/Journal2 ...
今天不忙，学习一下java.util.concurrent.DelayQueue这个类的使用。参照了
http://www.concretepage.com/java/example_delayqueue_java.php
上的例子，但是这里有个坑。
先看一下整个code吧：
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
public class DelayQueueExample {
...