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FinalizeEscapeGC.java
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66 lines (52 loc) · 1.32 KB
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package gc;
/*
* 两次自救，第二次失败，因为每个对象的finalize方法只有机会执行一次
*
* 尽量避免使用finalize方法
* */
public class FinalizeEscapeGC {
private static FinalizeEscapeGC SAVE_HOOK=null;
public void isAlive(){
System.out.println("yes,I am still alive");
}
@Override
protected void finalize() throws Throwable {
// TODO Auto-generated method stub
super.finalize();
System.out.println("finalize method execute");
FinalizeEscapeGC.SAVE_HOOK=this;
}
public static void main(String[] args) {
SAVE_HOOK=new FinalizeEscapeGC();
//1.成功自救
SAVE_HOOK=null;
System.gc();
//finalize方法优先级很低，暂停一会等等他
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(SAVE_HOOK!=null){
SAVE_HOOK.isAlive();
}else{
System.out.println("no,i am dead");
}
//和上面代码一样，，这次自救失败
SAVE_HOOK=null;
System.gc();
//finalize方法优先级很低，暂停一会等等他
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(SAVE_HOOK!=null){
SAVE_HOOK.isAlive();
}else{
System.out.println("no,i am dead");
}
}
}