我正在嘗試使用鍵作為字符串和值作為靜態(tài)類創(chuàng)建一個(gè) Map。但是當(dāng)我打印數(shù)據(jù)時(shí)，它只存儲(chǔ)最后一個(gè)鍵值對(duì)。有人可以幫我弄這個(gè)嗎。import java.util.HashMap;import java.util.Map;public class MapImplementation {    public static class Asset {        public static String assetName;        public static String assetType;        private void setAssetName(String name) {            Asset.assetName = name;        }        private void setAssetType(String type) {            Asset.assetType = type;        }        private String getAssetName() {            return assetName;        }        private String getAssetType() {            return assetType;        }    }    public static void main(String[] args) {        Map<String, Asset> map = new HashMap<>();        Asset asset1 = new Asset();        asset1.setAssetName("Vodafone");        asset1.setAssetType("STOCK");        map.put("Vodafone", asset1);        Asset asset2 = new Asset();        asset2.setAssetName("Google");        asset2.setAssetType("STOCK");        map.put("Google", asset2);        Asset asset3 = new Asset();        asset3.setAssetName("IBM");        asset3.setAssetType("BOND");        map.put("IBM", asset3);        for (String str : map.keySet()) {            Asset ast = map.get(str);            System.out.println(ast.getAssetName()+" "+ast.getAssetType());        }    }}我得到的輸出是：IBM BONDIBM BONDIBM BOND