如果有一个引用它的字段，元素是否会被垃圾收集？ [英] Will an element be garbage collected if there is a reference to its field?

问题描述

  class A {
 public String s; 
} 
  

和

  A a1 = new A（）; 
 a1.s =bla; 
 A a2 = new A（）; 
2.s = a1.s; 
 a1 = null; 
  

a1 被垃圾收集或是引用 a1.s 允许它被收集（并且我宁愿做一个深层复制， a2.s = new String（a1.s） ）？

非常感谢！

解决方案

如果对象持有另一个对象的引用，并且当您设置容器对象的引用 null ，子或包含 object 自动变为垃圾回收的资格。

有关更多信息，请参阅此链接。

I.e., in

class A {
    public String s;
}

and

A a1 = new A();
a1.s = "bla";
A a2 = new A();
a2.s = a1.s;
a1 = null;

will a1 be garbage collected or is the reference to a1.s permitting it from being collected (and I should rather do a deep copy, a2.s = new String(a1.s))?

Thanks a lot in advance!

解决方案

If an object holds a reference of another object and when you set container object's reference null, child or contained object automatically becomes eligible for garbage collection.

See this link for further information.

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