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Odd behavior when Java converts int to byte?
...
132 in digits (base 10) is 1000_0100 in bits (base 2) and Java stores int in 32 bits:
0000_0000_0000_0000_0000_0000_1000_0100
Algorithm for int-to-byte is left-truncate; Algorithm for System.out.println is two's-complement (Two's-complement is if leftmos...
How to implement a binary tree?
...plementation of binary search tree.
#!/usr/bin/python
class Node:
def __init__(self, val):
self.l = None
self.r = None
self.v = val
class Tree:
def __init__(self):
self.root = None
def getRoot(self):
return self.root
def add(self, val):
...
How do I get an object's unqualified (short) class name?
...Greg.Forbes Because Tenant doesn't exist in the current namespace. Try var_dump($tenant instanceof \Library\Entity\People\Tenant) instead. Also, investigate how to use the use operator, and the general concept behind PHP namespaces!
– lonesomeday
Nov 13 '13 at...
Python Linked List
...tains a cargo object and a reference to a linked list.
class Node:
def __init__(self, cargo=None, next=None):
self.car = cargo
self.cdr = next
def __str__(self):
return str(self.car)
def display(lst):
if lst:
w("%s " % lst)
display(lst.cdr)
else:
w("nil\n")
...
How can I represent an 'Enum' in Python?
...34. Code is not perfectly compatible between py2 and py3, e.g. you'll need __order__ in python 2).
To use enum34, do $ pip install enum34
To use aenum, do $ pip install aenum
Installing enum (no numbers) will install a completely different and incompatible version.
from enum import Enum #...
Code Golf: Lasers
...amp;!ge,$s=$r+=99for<>;%d='>.^1<2v3'=~/./g;($r)=grep$d|=$d{$t{$_}},%t;
{$_=$t{$r+=(1,-99,-1,99)[$d^=3*/\\/+m</>]};/[\/\\ ]/&&redo}die/x/?true:false,$/
The first line loads the input into %t, a table of the board where $t{99*i+j} holds the character at row i,column j. Then...
How to base64 encode image in linux bash / shell
...
You need to use cat to get the contents of the file named 'DSC_0251.JPG', rather than the filename itself.
test="$(cat DSC_0251.JPG | base64)"
However, base64 can read from the file itself:
test=$( base64 DSC_0251.JPG )
...
From an array of objects, extract value of a property as array
...
Check out Lodash's _.pluck() function or Underscore's _.pluck() function. Both do exactly what you want in a single function call!
var result = _.pluck(objArray, 'foo');
Update: _.pluck() has been removed as of Lodash v4.0.0, in favour of _...
How to access outer class from an inner class?
...f):
return Outer.Inner(self)
class Inner(object):
def __init__(self, outer_instance):
self.outer_instance = outer_instance
self.outer_instance.somemethod()
def inner_method(self):
self.outer_instance.anothermethod()
...
adito-gateway -华为云免费SSL VPN解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tar.gz
解压出来后，移动到usr目录
[root@adito mnt]# mv jdk1.7.0_17 /usr
配置java 参数
alternatives --install /usr/bin/java java /usr/jdk1.7.0_17/jre/bin/java 20000
alternatives --install /usr/bin/javaws javaws /usr/jdk1.7.0_17/jre/bin/javaws 20000
alternatives --install /usr/...