TestPutIfAbsentForm3WithSyncBlock.java

package object_in;

import java.util.HashMap;
import java.lang.String;

public class TestPutIfAbsentForm3WithSyncBlock {
	
	HashMap hm = new HashMap();
	
	public String doPutIfAbsent() {
		synchronized(this) {
			boolean result = hm.containsKey("a_key"); 
			if (!result) 
				return hm.put("a_key", "a_value");
			else
				return hm.get("a_key");
		}
	}
	
	public String doPutIfAbsent2() {
		synchronized(this) {
			if (!hm.containsKey("a_key")) 
				return hm.put("a_key", "a_value");
			else
				return hm.get("a_key");
		}
	}
}