查看java 版本

 

執行 java -version 命令，如下圖所示如果沒有明確顯示位數的，則說明是32位

C:\MyTools\jdk1.7.0\bin>java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode)

C:\MyTools\jdk1.7.0\bin>

進一步驗證可通過如下命令，輸出結果顯示不支持64位，則說明是32位

C:\MyTools\jdk1.7.0\bin>java -d32 -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode)

C:\MyTools\jdk1.7.0\bin>java -d64 -version
Error: This Java instance does not support a 64-bit JVM.
Please install the desired version.

C:\MyTools\jdk1.7.0\bin>

 

對於64位的，命令執行結果如下

C:\MyTools\jdk1.8.0\bin>java -version
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

C:\MyTools\jdk1.8.0\bin>java -d32 -version
Error: This Java instance does not support a 32-bit JVM.
Please install the desired version.

C:\MyTools\jdk1.8.0\bin>java -d64 -version
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

C:\MyTools\jdk1.8.0\bin>