Java EnumMap equals() 方法

2024年11月8日 | 2 分钟阅读

Java EnumMap 类的 equals() 方法用于比较两个映射是否相等。该方法基本上是将传入的对象与此 EnumMap 对象进行比较。

语法

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。

Exception

不适用

示例 1

import java.util.*;
public class EnumMapEqualsExample1 {
   // create an enum  
    public enum Tutorial {
   CSS, Python, PHP, Java, Javascript
   };
   public static void main(String[] args) {
   //create and populate enum map1 and map2  
      EnumMap<Tutorial, String>  map1 =
              new EnumMap<Tutorial, String> (Tutorial.class);
      EnumMap<Tutorial, String>  map2 =
              new EnumMap<Tutorial, String> (Tutorial.class);

      map1.put(Tutorial.CSS, "1");
      map1.put(Tutorial.Python, "2");
      map1.put(Tutorial.PHP, "3");
      map1.put(Tutorial.Java, "4");
      
      map2.put(Tutorial.CSS, "1");
      map2.put(Tutorial.Python, "2");
      map2.put(Tutorial.PHP, "3");
      map2.put(Tutorial.Java, "4");
      // print map1 and map2  
      System.out.println("Map1:"+map1);
      System.out.println("Map2:"+map2);
      // check equality   
      boolean equal = map1.equals(map2);
      System.out.println("Map1 and Map 2 are equal: "+equal);
      map2.put(Tutorial.Javascript, "5");
      // check equality again  
      equal = map1.equals(map2);
      System.out.println("Map1 and Map 2 are equal: "+equal);
   }
}

输出

Map1:{CSS=1, Python=2, PHP=3, Java=4}
Map2:{CSS=1, Python=2, PHP=3, Java=4}
Map1 and Map 2 are equal: true
Map1 and Map 2 are equal: false

示例 2

import java.util.*;  
public class EnumMapEqualsExample2 {  
   // create an enum  
   public enum Days {  
   Monday, Tuesday, Wednesday, Thursday  
   };  
   public static void main(String[] args) {  
   //create and populate enum map  
   EnumMap<Days, String> map1= new EnumMap<Days, String>(Days.class);  
   EnumMap<Days, String> map2= new EnumMap<Days, String>(Days.class);  

   map1.put(Days.Monday,"1");  
   map1.put(Days.Tuesday,"2");  
   map1.put(Days.Wednesday,"3");  
   

   map2.put(Days.Monday,"1");  
   map2.put(Days.Tuesday,"2");  
   map2.put(Days.Wednesday,"3");  
   
  // print map1 and map2  
   System.out.println("Map1:"+map1);
   System.out.println("Map2:"+map2);
   // check equality   
   boolean equal = map1.equals(map2);
   System.out.println("Map1 and Map 2 are equal: "+equal);
   map2.put(Days.Thursday,"4");  
   // check equality again  
   equal = map1.equals(map2);
   System.out.println("Map1 and Map 2 are equal: "+equal);
   }    
}  

输出

Map1:{Monday=1, Tuesday=2, Wednesday=3}
Map2:{Monday=1, Tuesday=2, Wednesday=3}
Map1 and Map 2 are equal: true
Map1 and Map 2 are equal: false

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Java EnumMap equals() 方法

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示例 1

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