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I have been trying to set the class path programmatically using System.setProperty("java.class.path",newPath). Though I set the class path, it throws an error.

This is my code:
class A

public static void main(String[] args)
System.out.println("prop: "+System.getProperty("java.class.path"));

B obj=new B();
System.out.println("Class A from C directory");
class B
public void display()
System.out.println("B class!!!");
public static void main(String[] args)
System.out.println("This is class B fom E directory");

I have another class file in E: directory and I want to access it. How can i set the class path in runtime in java?

What I have tried:

I have tried setting the path in commandline. It worked. But, I want to set it via code.

Error: error: cannot find symbol
B obj=new B();
  symbol:   class B
  location: class A
Updated 15-Jun-21 22:46pm
Patrice T 16-Jun-21 3:25am    
And you plan to tell the error message ?
15160877 16-Jun-21 3:30am    
CHill60 16-Jun-21 3:56am    
Where is your definition of B?
15160877 16-Jun-21 4:40am    
Richard MacCutchan 16-Jun-21 5:05am    
You could try setting it inside a static anonymous method, so it gets actioned as soon as the class is loaded.

I just tried that and it does not work.

1 solution

If class B is in another file then you need to import it. Follow the instructions here - Calling a class in another file[^]
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15160877 16-Jun-21 4:51am    
Is there any way of doing this by setting the classpath inside the program?
CHill60 16-Jun-21 5:16am    
The classpath will have already been read, so even if you amend the environment variable within your program it will have no effect

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