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public static void main( String[] args ){
Integer first = new Integer( 1 );
Integer second = new Integer( 1 );

System.out.println( first == second );
}

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java.lang.Object.equals()¸¦ »ç¿ëÇϽʽÿÀ.

public static void main( String[] args ){
Integer first = new Integer( 1 );
Integer second = new Integer( 1 );

System.out.println( first.equals( second ) );
}