Ubuntu 14 Installation Jdk7: Official website Download: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.htmlSelect Accept license and choose the JDK download that suits your model.1. unzip the downloaded JDK file: [email protected]:~$ lsWorkspace public template video picture document download music Desktop[Email protected]:~$ cd Download$ sudo mkdir/usr/lib/jvm$ sudo tar-zxvf jdk-7u55-linux-i586.tar.gz-c/USR/LIB/JVM2. Configure environment variables belowCommand
:OpenJDKSourceBundleldapjdk.x86_64:TheMozillaLDAPJavaSDK
2. Select a version to installWe install the 1.7 version here
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[[emailprotected]~]#yuminstalljava-1.7.0-openjdk
After the installation is complete, the default installation directory is:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_643. Setting Environment variables
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[[emailprotected]~]#vi/etc/profile
Add the following content:
123456
#setjavaenvir
Phenomenon:---------------------------------[ERROR] Failure executing Javac, but could not parse the error:Javac:invalid Target release:1.8Usage:javac Use-help for a list of possible option---------------------------------The survey found that:[Email protected] ~]# java-versionOPENJDK Version "1.8.0_65"OpenJDK Runtime Environment (build 1.8.0_65-b17)OpenJDK 64-bit Server VM (build 25.65-b01, Mixed mode)[Email protected] ~]# javac-versionJavac 1.7.0_111that is, Java is inconsistent with the Javac
First, install the Java SE JKDA, download Http://www.oracle.com/technetwork/java/javase/downloads/index.html?ssSourceSiteId=ocomen Select the latest version, the current latest version 1.8.0. Download jdk-8u45-linux-x64.tar.gz.B, unzip the download package, add environment variables.$ sudo vim ~/.BASHRCAdd at the end of the documentExport Java_home=/home/jeremy/jdk1.8.0export jre_home=${java_home}/jre export classpath=.:${java_home}/lib:${ Jre_home}/lib export Path=${java_home}/bin: $PATH It
-cookie "" http://download.oracle.com/otn-pub/java/jdk/8u111-b14/ jdk-8u111-linux-i586.tar.gz "# tar Xzf jdk-8u111-linux-i586.tar.gzNote: If Above wget command does not work for your watch this example video to download Java source archive using terminal.Install Java with alternativesAfter extracting archive file with Alternatives command to install it. Alternatives command is available in the chkconfig pac
Compile the Android 4.4.2 source code
In the previous article, I shared with you the process of downloading the android 4.4.2 source code in the sky (see the whole process of downloading the android4.4.2 source code (with the downloaded source code). Now I will write down the compilation notes.
Installing the JDK
The master branch of Android in the Android Open Source Project (AOSP) requires Java 7. On Ubuntu, use OpenJDK.
Java 7: For the latest version of Android
$ sudo apt-get update$ sudo
Build a Python development environment in Ubuntu 13.10:
Step 1 install JDK (to install eclipse ide)
Decompress the installation package and set JDK.
The update-alternatives -- install option feature adds a new set of system command links.
Tar-zxvf jdk-7u45-linux-x64.tar.gzSudo mkdir-p/usr/lib/jvmSudo mv./jdk1.7.0 _ 45/usr/lib/jvm/jdk1.7.0Sudo update-alternatives -- install "/usr/bin/java" "java" "/usr/lib/j
Practical Android skills: Switch JDK under Ubuntu
After Android L, we recommend that you use JDK 7 to compile the program. This is a natural development rule, just like compiling Android 1.6 4 years ago and using JDK 5.
Multi-version JDK can coexist. You only need to use the update-alternatives tool to switch between them at any time. The following describes how to install openjdk and oracle jdk (cannot cope with sun) and switch the version.1. Install
, but the new GBT non-empty block?? * Reach the scheduled time interval of 20 seconds (can be specified from the configuration file)
The Jobmaker command usesJobmaker, used for monitoring Kafka get the latest Bitcoin GBT messages, as well as the domain name currency nmcauxblock messages, and then send them to stratumjob by constructing Kafka.jobmaker -c jobmaker.cfg -l log_dir#-c指定jobmaker配置文件#-l指定日志目录Jobmaker.cfg configuration file//是否使用testnettestnet = true;jobmaker = {//发送stratum job间隔秒数
variable
3.jpg
Getrue command
Getrue--help View command Help,4.jpg
Genesis.json
Create your own test network. You first need to create the network's Genesis state, so that all nodes know and agree to this state.The Genesis state (or Genesis block) is a small JSON file. Such as2.jpg
简单介绍一下这个genesis.jsonchainId 链的IDalloc 系统自带的两个地址及余额coinbase 矿工工号difficulty 挖矿难度extraData 扩展字段gasLimit 交易手续费nonce 随机字符串,用于挖矿mixhash 配合nonce进行挖矿parent
to Standard alert dialog.Demo | DownloadPledge for CoinbasePledge for Coinbase by Zac Lovoy are a jQuery plugin that enables users to turn a single div tags into an embeded widgets for Displaying media and generating a Coinbase donation box attached to it in a visually appealing and easy format.Demo |Download14. JQuery Slot Machinejquery Slot Machine by Jose Luis Represa are a simple, lightweight jquery pl
. Coinbase, miner address. The RLP hash value of the state Trie root node in the Root,statedb. The RLP hash value of the TX trie root node in the Txhash,block. The RLP hash value of the receipt trie root node in the Receipthash,block. Difficulty, block difficulty, that is, the current mining difficulty. Number, block ordinal, which is the parent chunk number+1. Gaslimit, the theoretical upper limit of all gas consumption in a chunk, specified a
of a real blockchain as a geologic layer in geologic formations or as a sample of glacial cores. The surface may change with the seasons, even before it is blown away by the wind. But the deeper the geology, the more stable the geological layer becomes. Hundreds of feet deep, you will see a rock that has been preserved for millions of years but remains intact. In a real blockchain, the last few blocks may be modified due to a recalculation of the true blockchain fork. The newest six blocks are
at the end of the open file?
12345
# export Java env export java_home= /usr/local/java/jdk1 .7.0 export jre_home= /usr/local/java/jdk1 .7.0 /jre export classpath=.:%java_home% /lib/dt .jar:%java_home% /lib/tools .jar export path= $JAVA _home /bin : $JRE _home /bin : $PATH
Save the exit and enter the following command to make it effective?
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source~/.bash_profile
4. Configure the default JDK (this step can be omitted
Finally, you can upgrade your system by implementing C ++ 11 GCC4.8.1. The following steps can be performed to install GCC4.8.1, sudoadd-apt-repositoryppa: ubuntu-toolchain-r/testsudoupdate-alternatives -- remove-allgccsudoupdate-alternatives -- remove
Finally, the complete implementation of C ++ 11 GCC 4.8.1.
Upgrade your system.
The following steps can be performed to install GCC 4.8.1 in Ubuntu 13.04,
Su
downloaded cannot be installed.
Original
Go to the directory where you downloadedthe JRE package, and change the permissions so the file is executable. Forexample:
$ CD/tmp
$ Chmod A + x jre-6u25-linux-x64-rpm.bin
Translation
Go to the JRE directory you downloaded and change the directory permissions so that they can be authorized to other users.
$ CD/tmp
$ Chmod A + x jre-6u25-linux-x64-rpm.bin
Original
Extract and run the RPM file. For example:
$ Sudo./jre-6u25-linux-x64-rpm.bin
The RPM IN
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