Explain the function of static keyword and final keyword in Java in detail>>> 
When learning how to use Yum in centos6, I suddenly reported this exception. The most likely reason is that there is something wrong with the DNS server. Because the error said: unable to resolve the domain name ‘mirrorlist. CentOS. Org’
First of all, we can configure the DNS server by using the graphical interface or by modifying it
/etc/sysconfig/network-scripts/ifcfg-eth0
Add:
DNS1=10.1.1.111
The specific DNS address will be assigned automatically when dynamic allocation is used. It can be obtained by dynamic allocation before static configuration
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