相关疑难解决方法(0)

在java中,我想比较两个地图,如下所示,我们是否有现有的API来执行此操作？

谢谢

Map<String, String> beforeMap ;
beforeMap.put("a", "1");
beforeMap.put("b", "2");
beforeMap.put("c", "3");

Map<String, String> afterMap ;
afterMap.put("a", "1");
afterMap.put("c", "333");

//--- it should give me:
b is missing, c value changed from '3' to '333'