多项选择题
Click the Exhibit button. Which three code fragments, added individually at line 29, produce the output 100?（）
A.n = 100; B.i.setX( 100 ); C.o.getY().setX( 100 ); D.i = new Inner(); i.setX( 100 ); E.o.setY( i ); i = new Inner(); i.setX( 100 ); F.i = new Inner(); i.setX( 100 ); o.setY( i );
单项选择题 Given: What is the result?（）
多项选择题 Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）
单项选择题 Click the Exhibit button. What is the result? （）
