Android 弱引用

16lz 2021-01-23

Android 弱引用

public class reference {private StringBuilder stringBuilder;public reference() {// TODO Auto-generated constructor stubstringBuilder = new StringBuilder("test");}public StringBuilder getRefence() {return stringBuilder;}}

public class Reference_test {static reference ref;public static void main(String[] args) {// TODO Auto-generated method stubref = new reference();    WeakReference weakRef = new WeakReference(ref);          ref = null;    System.gc();        reference ref2 = weakRef.get();    if (ref2 == null) {    System.out.println("gc");    } else {    System.out.println(ref2.toString());    }    }}

输出结果为：gc;
这说明只要JVM进行垃圾回收，被弱引用关联的对象必定会被回收掉。不过要注意的是，这里所说的被弱引用关联的对象是指只有弱引用与之关联，如果存在强引用同时与之关联，则进行垃圾回收时也不会回收该对象

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