Java 中 SortedMap 等于()方法，示例

原文:https://www . geeksforgeeks . org/sorted map-equals-method-in-Java-with-examples/

SortedMap Java 中的 equals() 方法用于检查两个 SortedMap 实例之间的相等性。它验证作为参数传递的一个 SortedMap 的元素是否等于这个 SortedMap 的元素。

语法:

boolean equals(object obj)

参数:该方法接受该地图类型的一个参数对象，并引用要用该地图检查其相等性的地图。

返回值:该方法返回真如果两个对象映射相等，则返回假。

注:sorted Map 中的 equals()方法继承了 Java 中的地图界面。

下面的程序说明了 equals()方法:

程序 1:

// Java code to illustrate
// the equals() method

import java.util.*;

public class Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty SortedMap
        SortedMap<Integer, String> map1
            = new TreeMap<Integer, String>();
        SortedMap<Integer, String> map2
            = new TreeMap<Integer, String>();

        // Mapping string values to int keys
        map1.put(10, "Geeks");
        map1.put(15, "4");
        map1.put(20, "Geeks");
        map1.put(25, "Welcomes");
        map1.put(30, "You");

        // Mapping string values to int keys
        map2.put(10, "Geeks");
        map2.put(15, "4");
        map2.put(20, "Geeks");
        map2.put(25, "Welcomes");
        map2.put(30, "You");

        // Displaying the Map1
        System.out.println("First Map: "
                           + map1);

        // Displaying the Map2
        System.out.println("Second Map: "
                           + map2);

        // Checking the equality
        System.out.println(
            "Equality: "
            + map1.equals(map2));
    }
}

输出:

First Map:
 {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
Second Map:
 {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
Equality: true

程序二:

// Java code to illustrate
// the equals() method

import java.util.*;

public class Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty SortedMap
        SortedMap<Integer, String> map1
            = new TreeMap<Integer, String>();
        SortedMap<Integer, String> map2
            = new TreeMap<Integer, String>();

        // Mapping string values
        // to int keys for map1
        map1.put(10, "Geeks");
        map1.put(15, "4");
        map1.put(20, "Geeks");
        map1.put(25, "Welcomes");
        map1.put(30, "You");

        // Mapping string values
        // to int keys for map2
        map2.put(10, "Geeks");
        map2.put(15, "4");
        map2.put(20, "Geek");
        map2.put(25, "Welcomes");
        map2.put(30, "You");

        // Displaying the map 1
        System.out.println("First Map: "
                           + map1);

        // Displaying the map 2
        System.out.println("Second Map: "
                           + map2);

        // Displaying the equality
        System.out.println("Equality: "
                           + map1.equals(map2));
    }
}

输出:

First Map: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
Second Map: {10=Geeks, 15=4, 20=Geek, 25=Welcomes, 30=You}
Equality: false

参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/map . html # equals(Java . lang . object)

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