经典单例模式及测试

public class ClassicSingleton {
	private static ClassicSingleton instance=new ClassicSingleton();
	
	private ClassicSingleton() {
		
	}
	public static ClassicSingleton getInstance() {
		return instance;
	}
}

import java.util.logging.Logger;

import junit.framework.Assert;
import junit.framework.TestCase;


public class SingletonTest extends TestCase {
	private ClassicSingleton sone=null;
	private ClassicSingleton stwo=null;
	private static Logger logger=Logger.getAnonymousLogger();
	
	public SingletonTest(String name) {
		super(name);
	}
	
	public void setUp() {
		logger.info("getting singleton...");
		sone=ClassicSingleton.getInstance();
		logger.info("...got singleton: "+sone);
		
		logger.info("getting singleton...");
		stwo=ClassicSingleton.getInstance();
		logger.info("...got singleton: "+stwo);
	}
	public void testUnique() {
		logger.info("checking singleton for equality");
		Assert.assertEquals(true, sone==stwo);
	}
}