Java中的Java.util.EnumMap.equals(obj)用于將傳遞的對(duì)象與

句法：

boolean equals(Object obj)

參數(shù)：該方法采用Object類型的一個(gè)參數(shù)obj，并引用要與此映射進(jìn)行比較的映射。

返回值：如果指定的對(duì)象等于map，則該方法返回true，否則返回false。

下面的程序說(shuō)明了Java.util.EnumMap.equals()方法的工作原理

程序1：

// Java program to demonsrate equals() method

import java.util.*;

// An enum of gfg ranking worldwide and in India

public enum gfg {

Global_2018,

India_2018,

China_2018

}

;

class Enum_map {

public static void main(String[] args)

{

EnumMap mp1 = new EnumMap(gfg.class);

EnumMap mp2 = new EnumMap(gfg.class);

// Values are associated in mp1

mp1.put(gfg.Global_2018, 800);

mp1.put(gfg.India_2018, 72);

// Values are associated in mp2

mp2.put(gfg.Global_2018, 800);

mp2.put(gfg.India_2018, 72);

// Stores the result

boolean res1 = mp1.equals(mp2);

// Prints the result

System.out.println("Map1 equal to Map2: " + res1);

mp2.put(gfg.China_2018, 1607);

// Stores the result

boolean res2 = mp1.equals(mp2);

// Prints the result

System.out.println("Map1 equal to Map2: " + res2);

}

}

輸出：

Map1 equal to Map2: true

Map1 equal to Map2: false

程序2：

// Java program to demonsrate equals() method

import java.util.*;

// an enum of gdp growth rate

// in recent years of India

public enum gdp {

Ind_2015,

Ind_2016,

Ind_2017,

Ind_2018,

Ind_2019

}

;

class Enum_map {

public static void main(String[] args)

{

EnumMap mp1 = new EnumMap(gdp.class);

EnumMap mp2 = new EnumMap(gdp.class);

// Values are associated in mp1

mp1.put(gdp.Ind_2015, "8.4");

mp1.put(gdp.Ind_2016, "9.2");

mp1.put(gdp.Ind_2017, "6.1");

mp1.put(gdp.Ind_2018, "7.7");

// Values are associated in mp2

mp2.put(gdp.Ind_2015, "8.4");

mp2.put(gdp.Ind_2016, "9.2");

mp2.put(gdp.Ind_2017, "6.1");

mp2.put(gdp.Ind_2018, "7.7");

// Stores the result

boolean res1 = mp1.equals(mp2);

// Prints the result

System.out.println("Map1 equal to Map2: " + res1);

mp2.put(gdp.Ind_2019, "7.0");

// Stores the result

boolean res2 = mp1.equals(mp2);

// Prints the result

System.out.println("Map1 equal to Map2: " + res2);

}

}

輸出：

Map1 equal to Map2: true

Map1 equal to Map2: false

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