Java中的Java.util.EnumMap.putAll(map)方法用於將所有映射從一個映射複製到一個新的映射。較舊的映射將替換為較新的映射。
用法:
void putAll(map)
參數:該方法采用一個參數Map。它是要複製到較新的Map。
返回值該方法不返回任何值。
以下示例程序旨在說明putAll()方法:
示例1:
// Java program to demonstrate keySet()
import java.util.*;
// An enum of geeksforgeeks
public enum gfg {
Global_today,
India_today,
China_today
};
class Enum_demo {
public static void main(String[] args)
{
EnumMap<gfg, Integer> mp1 =
new EnumMap<gfg, Integer>(gfg.class);
EnumMap<gfg, Integer> mp2 =
new EnumMap<gfg, Integer>(gfg.class);
// Values are associated
mp1.put(gfg.Global_today, 799);
mp1.put(gfg.India_today, 69);
// Copies all the mappings of mp1 to mp2
mp2.putAll(mp1);
// Prints the first map
System.out.println("Mappings in Map1: " + mp1);
// Prints the second map
System.out.println("Mappings in Map2: " + mp2);
}
}
輸出:
Mappings in Map1: {Global_today=799, India_today=69} Mappings in Map2: {Global_today=799, India_today=69}
示例2:
// Java program to demonstrate the working of keySet()
import java.util.*;
// an enum of geeksforgeeks
// visitors in India and United States
public enum gfg {
India_today,
United_States_today
}
;
class Enum_demo {
public static void main(String[] args)
{
EnumMap<gfg, String> mp1 =
new EnumMap<gfg, String>(gfg.class);
EnumMap<gfg, String> mp2 =
new EnumMap<gfg, String>(gfg.class);
// Values are associated
mp1.put(gfg.India_today, "61.8%");
mp1.put(gfg.United_States_today, "18.2%");
// Copies all the mappings of mp1 to mp2
mp2.putAll(mp1);
// Prints the first map
System.out.println("Mappings in Map1: " + mp1);
// Prints the second map
System.out.println("Mappings in Map2: " + mp2);
}
}
輸出:
Mappings in Map1: {India_today=61.8%, United_States_today=18.2%} Mappings in Map2: {India_today=61.8%, United_States_today=18.2%}
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注:本文由純淨天空篩選整理自akash1295大神的英文原創作品 EnumMap putAll(map) Method in Java。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。