Java EnumMap equals() 方法

java.util.EnumMap.equals() 方法用于比较指定对象与此映射是否相等。如果给定对象也是映射并且两个映射表示相同的映射，则该方法返回 true。

语法

public boolean equals(Object obj)

参数

返回值

如果指定对象等于此映射，则返回 true，否则返回 false。

异常

示例:

在下面的示例中，java.util.EnumMap.equals() 方法用于比较 EnumMap 是否相等。

import java.util.*;

public class MyClass {
  
  //创建一个枚举
  public enum weekday{
    RED, BLUE, GREEN
  }

  public static void main(String[] args) {
    //创建 EnumMap
    EnumMap<weekday,Integer> Map1 = 
        new EnumMap<weekday,Integer>(weekday.class);
    EnumMap<weekday,Integer> Map2 = 
        new EnumMap<weekday,Integer>(weekday.class);
    EnumMap<weekday,Integer> Map3 = 
        new EnumMap<weekday,Integer>(weekday.class);

    //关联Map1中的值
    Map1.put(weekday.RED, 1);
    Map1.put(weekday.BLUE, 2);
    Map1.put(weekday.GREEN, 3);

    //关联Map2中的值
    Map2.put(weekday.RED, 1);
    Map2.put(weekday.BLUE, 2);
    Map2.put(weekday.GREEN, 3);

    //关联Map3中的值
    Map3.put(weekday.RED, 10);
    Map3.put(weekday.BLUE, 20);
    Map3.put(weekday.GREEN, 30);

    //检查Map1和Map2是否相等
    System.out.println("Map1 and Map2 are equal? - " + Map1.equals(Map2));

    //检查Map1和Map2是否相等
    System.out.println("Map1 and Map3 are equal? - " + Map1.equals(Map3));
  }
}

输出上述代码将是:

Map1 and Map2 are equal? - true
Map1 and Map3 are equal? - false