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SoftReferenceDemo.java
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SoftReferenceDemo.java
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package jvm;
import java.lang.ref.SoftReference;
public class SoftReferenceDemo {
public static void main(String[] args) {
softRef_Memory_Enough();
System.out.println("Not Enough");
softRef_Memory_NotEnough();
}
private static void softRef_Memory_Enough() {
Object o1 = new Object();
SoftReference<Object> softReference = new SoftReference<>(o1);
System.out.println(o1);
System.out.println(softReference.get());
System.out.println("===========");
o1 = null;
System.gc();
System.out.println(o1);
System.out.println(softReference.get());
}
private static void softRef_Memory_NotEnough() {
Object o1 = new Object();
SoftReference<Object> softReference = new SoftReference<>(o1);
System.out.println(o1);
System.out.println(softReference.get());
System.out.println("===========");
o1 = null;
System.gc();
try {
byte[] bytes = new byte[30 * 1024 * 1024];
} catch (Exception e) {
e.printStackTrace();
} finally {
System.out.println(o1);
System.out.println(softReference.get());
}
}
}