SingletonTest

public class SingletonTest {
    private static SingletonTest stTest = null;
    public static SingletonTest getInstance() {
        if( stTest == null ){
            stTest = new SingletonTest();
        }
        return stTest;
    }
    public static void main(String[] args) {
        SingletonTest tmpInstance = SingletonTest.getInstance();
    }
}

* public static synchronized SingletonTest getInstance() { //이렇게 하면 한번에 하나만 실행된다.

더보기

http://www.ibm.com/developerworks/kr/library/j-dcl.html