使用Eclipse集合中的软值映射

import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.Map;

public class SoftValueMap<K, V> {
    private final Map<K, SoftReference<V>> map = new HashMap<>();

    public void put(K key, V value) {
        map.put(key, new SoftReference<>(value));
    }

    public V get(K key) {
        SoftReference<V> reference = map.get(key);
        if (reference != null) {
            return reference.get();
        }
        return null;
    }

    public void remove(K key) {
        map.remove(key);
    }

    public static void main(String[] args) {
        SoftValueMap<String, byte[]> cache = new SoftValueMap<>();

        // 添加一些数据到缓存
        cache.put("image1", new byte[1024 * 1024]); // 1MB
        cache.put("image2", new byte[2 * 1024 * 1024]); // 2MB

        // 模拟内存紧张情况
        System.gc();

        // 尝试获取数据
        byte[] image1 = cache.get("image1");
        if (image1 != null) {
            System.out.println("Image1 found in cache");
        } else {
            System.out.println("Image1 not found in cache (可能已被回收)");
        }
    }
}