弱い参照とな - Qiitapackage references; public class Sheryl { public void sing(){ System.out.println("生き残りたい"); } } package references; import java.lang.ref.*; public class Main { public static void main(String[] args) { Sheryl strongRef = new Sheryl();//① WeakReference<Sheryl> weakRef = new WeakReference<Sheryl>(strongRef);//② strongRef = null;//③ Sheryl sheryl = weakRef.get(); if (sheryl != null){ System.out.printl
