请问((Float) arg).floatValue()是什么意思public void update(Observable obj,Object arg){\x09\x09if(arg instanceof Float){\x09\x09\x09System.out.print(this.name+"观察到价格更改为");\x09\x09\x09System.out.println(((Float) arg).floatValue()
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![请问((Float) arg).floatValue()是什么意思public void update(Observable obj,Object arg){\x09\x09if(arg instanceof Float){\x09\x09\x09System.out.print(this.name+](/uploads/image/z/1207606-22-6.jpg?t=%E8%AF%B7%E9%97%AE%28%28Float%29+arg%29.floatValue%28%29%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9Dpublic+void+update%28Observable+obj%2CObject+arg%29%7B%5Cx09%5Cx09if%28arg+instanceof+Float%29%7B%5Cx09%5Cx09%5Cx09System.out.print%28this.name%2B%22%E8%A7%82%E5%AF%9F%E5%88%B0%E4%BB%B7%E6%A0%BC%E6%9B%B4%E6%94%B9%E4%B8%BA%22%29%3B%5Cx09%5Cx09%5Cx09System.out.println%28%28%28Float%29+arg%29.floatValue%28%29)
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