What is the difference between using soft references and weak references in memory management in Java?

In Java, soft references (SoftReference) and weak references (WeakReference) are used for memory management, but they differ in the lifetime of objects:

• Soft references (SoftReference): objects that are only softly reachable will be garbage collected only when the JVM needs memory. This is useful for caching — objects are retained longer until memory becomes limited.

• Weak references (WeakReference): objects that are only weakly reachable can be garbage collected during the next GC cycle, even if there is enough memory. They are used to implement weak collections, where objects should not prevent garbage collection.

Example:

SoftReference<MyObject> softRef = new SoftReference<>(new MyObject());
WeakReference<MyObject> weakRef = new WeakReference<>(new MyObject());

Thus, soft references provide a longer object lifetime compared to weak references.