检查 Java 中的两个 HashMap 是否相等


如需检查两个 HashMap 是否相等,请使用 equals() 方法。

我们首先创建第一个 HashMap -

// Create hash map 1
HashMap hm1 = new HashMap();
hm1.put("Shirts", new Integer(700));
hm1.put("Trousers", new Integer(600));
hm1.put("Jeans", new Integer(1200));
hm1.put("Android TV", new Integer(450));
hm1.put("Air Purifiers", new Integer(300));
hm1.put("Food Processors", new Integer(950));

现在我们创建第二个 HashMap -

HashMap hm2 = new HashMap();
hm2.put("Shirts", new Integer(700));
hm2.put("Trousers", new Integer(600));
hm2.put("Jeans", new Integer(1200));
hm2.put("Android TV", new Integer(450));
hm2.put("Air Purifiers", new Integer(300));
hm2.put("Food Processors", new Integer(950));

如需检查两个 HashMap 是否相等,请像这样使用 equals() 方法 -

hm1.equals(hm2)

以下是一个示例,用于检查两个 HashMap 是否相等 -

示例

 在线演示

import java.util.*;
public class Demo {
   public static void main(String args[]) {
      // Create hash map 1
      HashMap hm1 = new HashMap();
      hm1.put("Shirts", new Integer(700));
      hm1.put("Trousers", new Integer(600));
      hm1.put("Jeans", new Integer(1200));
      hm1.put("Android TV", new Integer(450));
      hm1.put("Air Purifiers", new Integer(300));
      hm1.put("Food Processors", new Integer(950));
      System.out.println("Map 1 = "+hm1);
      // Create hash map 2
      HashMap hm2 = new HashMap();
      hm2.put("Shirts", new Integer(700));
      hm2.put("Trousers", new Integer(600));
      hm2.put("Jeans", new Integer(1200));
      hm2.put("Android TV", new Integer(450));
      hm2.put("Air Purifiers", new Integer(300));
      hm2.put("Food Processors", new Integer(950));
      System.out.println("Map 2 = "+hm2);
      System.out.println("Map 1 is equal to Map 2? "+hm1.equals(hm2));
   }
}

输出

Map 1 = {Shirts=700, Food Processors=950, Air Purifiers=300, Jeans=1200, Android TV=450, Trousers=600}
Map 2 = {Shirts=700, Food Processors=950, Air Purifiers=300, Jeans=1200, Android TV=450, Trousers=600}
Map 1 is equal to Map 2? true

更新于: 30-Jul-2019

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