Java EnumMap clone()

Java EnumMap类的 clone()方法用于将一个地图的映射值复制到另一张地图。此方法将创建此地图的浅表副本。

语法

public EnumMap<K, V>clone()

参数

此方法返回此枚举映射的浅表副本。

异常

基本语法

EnumMapTwo = EnumMapOne.clone();

示例1

import java.util.*;
public class EnumMapCloneExample1 {
    public enum Tutorial {
    Java, Python, PHP, Android, AngularJS
  };
    public static void main(String[] args) {
        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");
        System.out.println("Values of map before cloning:");
        System.out.println("map1:"+map1);
        System.out.println("map2:"+map2);
        map2 = map1.clone();
        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 {
    public enum Days {
    Monday, Tuesday, Wednesday, Thursday
   }
    ;
    public static void main(String[] args) {
        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");
        System.out.println("Values of map before cloning:");
        System.out.println("map1:"+map1);
        System.out.println("map2:"+map2);
        map2 = map1.clone();
        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}

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