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How to change version of JRE without installation

 
Greenhorn
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Hi all,
My project is using jre1.3.1_01 and I want to change version to jre1.3.1_09.
My project has two folder which are \bin and \lib.
In \bin, we have java.exe and dll stuff.
In \lib, we have java lib such as rt.jar, i18n.jar and properties files.
If I want to change version what I have to do?
I will copy all files in jre1.3.1_09\bin to Myproject\bin.
Do I have to copy the library and properties file from jre1.3.1_09\lib to Myproject\lib.
Note. My project calls java.exe from the bin directory in the project.
If I use the same library which comes from jre1.3.1_01 but I use java.exe from jre1.3.1_09, Can I say that I use jre version 1.3.1_09. (Just wanna change the runtime environment)
If I have to change all, What is the effect to my project?
Now the compiler script is using jdk1.3.1_01. Can I build a project from jdk1.3.1_01 but run on 1.3.1_09 environment? I know it cans but I just wanna know this is a good practice or not. What else can be affected?
Thank you so much.
And also, one more question, I saw many files in jre1.3.1_09 linking to java.wrapper.
Could anyone tell me what does it mean?
 
lalelle lalelle
Greenhorn
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Please just help me
 
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