转载自:http://javaconceptoftheday.com/types-of-references-in-java-strong-soft-weak-and-pha...
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转载自:http://javaconceptoftheday.com/types-of-references-in-java-strong-soft-weak-and-pha...
public class A { private int a; public A(int a) {this.a= a;} protected void finalize() ...