String sg=new String("hfeigie");为什么说在堆内开辟了两条空间一个成了垃圾
为什么呢？？？？？？？？
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首先String在java里是final的，说明String类型是创建一次的实际上String a = new String("a")相当于String a = new String();a="a";所以生成了两个对象，也就开辟了两个空间