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public class ClassA {
private volatile Object [] o;
public void methodA {
o=null;
//...
}

}
¼Ö·ç¼Ç private volatile ¹è¿­ Çʵå 'o'ÀÇ »ç¿ëÀ» Àç°ËÅäÇϽʽÿÀ.