Java.util.EnumMap.equals() Java.util.EnumMap.entrySet() Java.util.EnumMap.get() 描述 所述java.util.EnumMap.equals(Object O)方法指定对象与此映射的equality.Both对象必须地图进行比较。 声明 以下是java.util.EnumMap.equals()方法的声明 public boolean equals(Object o) 参数 o - 要与此映射进行相等性比较的对象。 返回值 如果指定的对象等于此映射,则此方法返回true 异常 NA 实例 以下示例显示了java.util.EnumMap.equals()方法的用法。 package com.tutorialspoint; import java.util.*; public class EnumMapDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { EnumMap<Numbers, String> map1 = new EnumMap<Numbers, String>(Numbers.class); EnumMap<Numbers, String> map2 = new EnumMap<Numbers, String>(Numbers.class); // associate values in map1 map1.put(Numbers.ONE, "1"); map1.put(Numbers.TWO, "2"); map1.put(Numbers.THREE, "3"); map1.put(Numbers.FOUR, "4"); // associate values in map2 map2.put(Numbers.ONE, "1"); map2.put(Numbers.TWO, "2"); map2.put(Numbers.THREE, "3"); map2.put(Numbers.FOUR, "4"); // print the maps System.out.println("map1:" + map1); System.out.println("map2:" + map2); // check for equality between maps boolean equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); // add one more value in map2 map2.put(Numbers.FIVE, "5"); // check for equality between maps equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); } } 让我们编译并运行上面的程序,这将产生以下结果 map1:{ONE=1, TWO=2, THREE=3, FOUR=4} map2:{ONE=1, TWO=2, THREE=3, FOUR=4} Map1 and map 2 are equal:true Map1 and map 2 are equal:false Java.util.EnumMap.entrySet() Java.util.EnumMap.get()