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ubuntu install sun jdk 1.7

download jdk-7u25-linux-x64.tar.gz from oracle site.
unpack jdk-7u25-linux-x64.tar.gz
Install it. Actually, you needn't install it, just copy the directory to a specified place.

$ sudo mkdir /usr/local/java

$ sudo cp jdk1.7.0_25 /usr/local/java

redhat enterprise linux 6.1系统中默认安装了openjdk，可是我想用的是sun的jdk。