Java 中的 NavigableMap ceilingEntry()方法
原文:https://www . geesforgeks . org/naviglamblemap-ceilingentry-method-in-Java/
Java 中导航映射接口的 cielingEntry()方法用于返回与大于或等于给定键的最小键相关联的键值映射，如果不存在这样的键，则返回 null。
语法 :
Map.Entry< K, V > ceilingEntry(K key)
参数:接受单个参数键，这是要映射的键。
返回值:返回与大于等于给定键的最小键相关联的键值映射，如果不存在这样的键，则返回空值。
下面的程序说明了 Java 中的 ceilingEntry()方法:
程序 1 :按键为整数时。
// Java code to demonstrate the working of
// ceilingEntry() method
import java.io.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the NavigableMap of Integer and String
NavigableMap<Integer, String> navmap = new TreeMap<>();
// assigning the values in the NavigableMap
// using put()
navmap.put(2, "two");
navmap.put(7, "seven");
navmap.put(3, "three");
// Use of ceilingEntry()
// returns 7=seven ( next greater key-value)
System.out.println("The next greater key-value of 5 is : "
+ navmap.ceilingEntry(5));
// returns "null" as no value present
// greater than or equal to number
System.out.println("The next greater key-value of 8 is : "
+ navmap.ceilingEntry(8));
}
}
输出:
The next greater key-value of 5 is : 7=seven
The next greater key-value of 8 is : null
程序 2 :当按键为字符串时。
// Java code to demonstrate the working of
// ceilingEntry() method
import java.io.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the NavigableMap of String and String
NavigableMap<String, String> navmap = new TreeMap<String, String>();
// assigning the values in the NavigableMap
// using put()
navmap.put("one", "Geeks");
navmap.put("two", "for");
navmap.put("three", "Geeks");
// Use of ceilingEntry()
// returns one = Geeks ( next greater key-value of "a")
System.out.println("The next greater key-value of a is : "
+ navmap.ceilingEntry("a"));
// returns three = Geeks
System.out.println("The next greater key-value of p is : "
+ navmap.ceilingEntry("p"));
}
}
输出:
The next greater key-value of a is : one=Geeks
The next greater key-value of p is : three=Geeks
参考:https://docs . Oracle . com/javase/10/docs/API/Java/util/naviglamblemap . html # ceilingEntry(K)
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