java - 比较并提取两个 Hashmap

Question

我使用Scanner读取A.txt生成A Hashmap，也可以用同样的方法读取 B.txt 以获得 B Hashmap。这两个 HashMap 具有“SOME”相同的键，并且希望彼此组合。如果key相同，则打印出“key, value1, value2”。这是我到目前为止所拥有的:

public static void main (String[] args) throws FileNotFoundException {
Scanner scanner1 = new Scanner(new File("score.txt"));
Map<String, String> tolerance = new HashMap<>();
Scanner scanner2 = new Scanner(new File("Count2.txt"));
Map<String, String> Pdegree = new HashMap<>();
while (scanner1.hasNextLine()) {
String line = scanner1.nextLine();
String[] array = line.split("\t",2);
String Name = array[0];
String score = array[1];
tolerance.put(Name,score);
}
while (scanner2.hasNextLine()) {
    String line2 = scanner2.nextLine();
    String[] array2 = line2.split("\t",2);
    String Name2 = array2[0];
    String degree = array2[1];
    Pdegree.put(Name2,degree);
    }
    for(Map.Entry<String, String> entry : tolerance.entrySet()) {
    String key = entry.getKey();
    String value = entry.getValue();
            for(Map.Entry<String, String> entry2 : Pdegree.entrySet()) {
            String key2 = entry2.getKey();
            String value2 = entry2.getValue();
            if(key==key2){
            System.out.println(key2 + "\t" + value + "\t" + value2);
            }
    }
 }
}
}

结果和错误消息都不会显示。我的问题是如何从两个映射中提取具有各自值的相同键。谢谢。

Answer 1

我自己找到了答案。应该是

 if(key.equals(key2))