折腾：
【未解决】Mac中用VSCode调试java代码
期间，参考：
➜ java echo $JAVA_HOME
没设置JAVA_HOME
➜ java which java /usr/bin/java
可以找到java
看看版本
➜ java java --version Unrecognized option: --version Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. ➜ java java -v Unrecognized option: -v Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. ➜ java java -V Unrecognized option: -V Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. ➜ java java -version java version "1.8.0_112" Java(TM) SE Runtime Environment (build 1.8.0_112-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode)
是1.8.0_112
所以感觉是：
要么是加上JAVA_HOME
要么是：去mac中安装JDK
先去mac中确认，是否之前已安装成功JDK，如果没有，再去安装
另外：
也要求是：
“* JDK 1.8 or later”
mac verify installed jdk
➜ ~ javac -version javac 1.8.0_112 ➜ ~ which javac /usr/bin/javac
好像就算是确认jdk已安装了。
去看看：
➜ ~ /usr/libexec/java_home -V Matching Java Virtual Machines (2): 1.8.0_112, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home 1.7.0_79, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home ➜ ~ which java_home java_home not found
➜ ~ java -version java version "1.8.0_112" Java(TM) SE Runtime Environment (build 1.8.0_112-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode) ➜ ~ javac -version javac 1.8.0_112
去看看
➜ ~ ll /Library/Java/JavaVirtualMachines/ total 0 drwxr-xr-x 3 root wheel 96B 10 20 2015 jdk1.7.0_79.jdk drwxr-xr-x 3 root wheel 96B 12 17 2016 jdk1.8.0_112.jdk ➜ ~ ll /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk total 0 drwxrwxr-x 5 root wheel 160B 10 1 2016 Contents
【总结】
此处，通过：
➜ ~ javac -version javac 1.8.0_112
就可以确认已经安装了JDK了 -》 才会有javac编译器可用。
另外相关的：
➜ ~ java -version java version "1.8.0_112" Java(TM) SE Runtime Environment (build 1.8.0_112-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode)
应该只算：确认已安装了JRE -》 所以有java可用-》能运行java的东西了。
更深入的：
想要找到当前系统中所安装的所有的java版本：
➜ ~ /usr/libexec/java_home -V Matching Java Virtual Machines (2): 1.8.0_112, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home 1.7.0_79, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home
可以看出有2个版本：
- 1.8.0_112
- 1.7.0_79
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