关于null referencesuppose we hava a class A which has a constructor that takes a single integer.A a = new A (100);
A b = new A (150);
A c = b;
b = a;
a = null;有多少个A object存在? 哪些objects?
A b = new A (150);
A c = b;
b = a;
a = null;有多少个A object存在? 哪些objects?
解决方案 »
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