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How To Use The Registry to Store Information

Java How To: Source Code

With JDK1.4, the Preferences can use the Windows registry :

import java.util.prefs.Preferences;

public class UsingReg 
{

	public static final String REALKEY= "com.rgagnon.foo";

	public static void main(String[] args)
	{
		new UsingReg().doit();
	}

	public void doit() 
	{
		// write into HKCU\Software\Javasoft\Prefs\com.rgagnon.foo
		Preferences p = Preferences.userRoot();
		p.put(REALKEY, "bar");

		// read back from HKEY_CURRENT_USER
		System.out.println(p);
		System.out.println(p.get(REALKEY, "HKCU houston we have a problem"));

		// write into HKLM\Software\Javasoft\Prefs\com.rgagnon.foo
		p = Preferences.systemRoot();
		p.put(REALKEY, "barbar");

		// read back from HKEY_LOCAL_MACHINE
		System.out.println(p);
		System.out.println(p.get(REALKEY, "HKLM houston we have a problem"));
	}
}

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