yum命令安装jdk

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1、查看是否已安装JDK,卸载

yum list installed |grep java

java-1.8.-openjdk.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-accessibility.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-accessibility-debug.x86_64
java-1.8.-openjdk-debug.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-demo.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-demo-debug.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-devel.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-devel-debug.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-headless.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-headless-debug.x86_64
java-1.8.-openjdk-javadoc.noarch :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-javadoc-debug.noarch :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-javadoc-zip.noarch :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-javadoc-zip-debug.noarch
java-1.8.-openjdk-src.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-1.8.-openjdk-src-debug.x86_64 :1.8.0.181-.b13.el7_5 @updates
java-atk-wrapper.x86_64 0.30.-.el7 @base
javapackages-tools.noarch 3.4.-.el7 @base
python-javapackages.noarch 3.4.-.el7 @base
tzdata-java.noarch 2018e-.el7 @updates