合并两行-表示两个值，或保留一行中的数据，如果其他行中缺少数据

# 合并两个字符串
str1 = "Hello"
str2 = "World"
merged_str = str1 + " " + str2
print(merged_str)

# 保留一行中的缺少数据
data1 = {"name": "John", "age": 25}
data2 = {"name": "Mary", "city": "New York"}
merged_data = {**data1, **data2}
print(merged_data)

// 合并两个字符串
String str1 = "Hello";
String str2 = "World";
String mergedStr = str1 + " " + str2;
System.out.println(mergedStr);

// 保留一行中的缺少数据
Map<String, Object> data1 = new HashMap<>();
data1.put("name", "John");
data1.put("age", 25);
Map<String, Object> data2 = new HashMap<>();
data2.put("name", "Mary");
data2.put("city", "New York");
Map<String, Object> mergedData = new HashMap<>(data1);
mergedData.putAll(data2);
System.out.println(mergedData);