SoftReference
The SoftReference class describes a Reference object whose referent is softly reachable.
SoftReference is useful for caching objects that are expensive timewise to create and/or occupy significant amounts of heap space.
import java.lang.ref.SoftReference;
public class Main {
public static void main(String[] args) {
Integer integer = Integer.parseInt("0");
System.out.println("caching Integer");
SoftReference<Integer> cache = new SoftReference<Integer>(integer);
integer = null;
if(cache.get() != null) {
System.out.println("Integer is still cached");
}
}
}