getEnv : Java Glossary

by Roedy Green ©1996-2009 Canadian Mind Products
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getEnv

System.getEnv, to get at environment parameters, has been deprecated. What do you do instead?

Use a properties file
This has the advantage of being platform independent.
Use the <APPLET <PARAM tags
which generate a Property. This only works for Applets.
Pass the parameters in on the command line
There are several ways of doing this. These techniques only work in applications, not Applets.
- Named parm technique
  the string "flavour=strawberry" will appear as arg[0] in your main method.
```
java.exe MyClass flavour=strawberry
```
- Simple parm replacement technique
  the string "strawberry" will appear as arg[0] in your main method. The % works in Windows, NT, 4DOS and 4NT. You may need to do something slightly different in other OSes.
```
set flavour=strawberry
java.exe MyClass %flavour%
```
- -D technique
  System property flavour with value "strawberry " will be accessible via System.getProperty("flavour"); Make sure you put the -D before your classname or else you will find "-Dflavour=strawberry " appearing at arg[0] instead. Contrary to rumour, this feature is also available in JDK 1.1. Make sure you use an upper case D.
```
set flavour=strawberry
java.exe -Dflavour=%flavour% MyClass
```

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Use a properties file