Java EnumMap clone() 方法

2024年11月8日 | 2 分钟阅读

Java EnumMap 类的 clone() 方法用于将一个映射的值复制到另一个映射。此方法创建此映射的浅拷贝。

语法

参数

不适用

返回值

此方法返回此枚举映射的浅拷贝。

Exception

不适用

基本语法

EnumMapTwo=EnumMapOne.clone();

示例 1

import java.util.*;  
public class EnumMapCloneExample1 {  
   // create an enum
  public enum Tutorial {
  Java, Python, PHP, Android,  AngularJS
  };
   public static void main(String[] args) {
   //create and populate enum map  
   EnumMap<Tutorial, String>  map1 =
              new EnumMap<Tutorial, String> (Tutorial.class);
   EnumMap<Tutorial, String>  map2 =
              new EnumMap<Tutorial, String> (Tutorial.class);

   map1.put(Tutorial.Java,"1");
   map1.put(Tutorial.Python,"2");
   map1.put(Tutorial.PHP,"3");
   map1.put(Tutorial.Android,"4");
   map1.put(Tutorial.AngularJS,"5");
   // print the map1 and map2  
   System.out.println("Values of map before cloning:");
   System.out.println("map1:"+map1);
   System.out.println("map2:"+map2);
   // clone the map1  
   map2 = map1.clone();
  // print the map1 and map2 again  
   System.out.println("Values of map after cloning:");
   System.out.println("map1:"+map1);
   System.out.println("map2:"+map2);
   }
}

输出

Values of map before cloning:
map1:{ Java=1, Python=2, PHP=3, Android=4, AngularJS=5}
map2:{}
Values of map after cloning:
map1:{ Java=1, Python=2, PHP=3, Android=4, AngularJS=5}
map2:{ Java=1, Python=2, PHP=3, Android=4, AngularJS=5}

示例 2

import java.util.*;  
public class EnumMapCloneExample2 {  
   // 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");  
   map1.put(Days.Thursday,"4");  
   // print the map1 and map2  
   System.out.println("Values of map before cloning:");
   System.out.println("map1:"+map1);
   System.out.println("map2:"+map2);
   // clone the map1  
   map2 = map1.clone();
  // print the map1 and map2 again  
   System.out.println("Values of map after cloning:");
   System.out.println("map1:"+map1);
   System.out.println("map2:"+map2);
   }    
}  

输出

Values of map before cloning:
map1:{Monday=1, Tuesday=2, Wednesday=3, Thursday=4}
map2:{}
Values of map after cloning:
map1:{Monday=1, Tuesday=2, Wednesday=3, Thursday=4}
map2:{Monday=1, Tuesday=2, Wednesday=3, Thursday=4}

下一主题Java-enummap-containskey-method

Java EnumMap clone() 方法

语法

参数

返回值

Exception

基本语法

示例 1

示例 2

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Java EnumMap clone() 方法

语法

参数

返回值

Exception

基本语法

示例 1

示例 2

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