如何在Java中按键对Map值排序？
假设以下是带有未排序键的Map-
HashMap<String, String>map = new HashMap<String, String>();
map.put("1", "A");
map.put("6", "B");
map.put("3", "C");
map.put("7", "D");
map.put("5", "E");
map.put("2", "F");
map.put("4", "G");
map.put("8", "H");现在，对上面的映射进行排序。以下tMap的结果将是按键排序的映射-
Map<String, String>tMap = new TreeMap<String, String>(map);
示例
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
public class Demo {
public static void main(String[] args) {
HashMap<String, String>map = new HashMap<String, String>();
map.put("1", "A");
map.put("6", "B");
map.put("3", "C");
map.put("7", "D");
map.put("5", "E");
map.put("2", "F");
map.put("4", "G");
map.put("8", "H");
Map<String, String>tMap = new TreeMap<String, String>(map);
System.out.println("Sorted Map values: "+tMap);
}
}输出结果
{1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H}