java的字符串为什么不可变

字符串的内存展示 String a = “500asd” ; String b = “500asd” ; String c = new String(“500asd” ); String D = new String(“500asd” ); 赋值之后a==b，a!=c!=D,b!=c!=D String c = new String(“500asd” ); String D = new Strin

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